Можно ввести несколько слов — все они попадут в требования к поиску. Кроме того, осуществляется поиск по словоформам и, если повезет, по синонимам. Поддерживается поиск по названию, автору и специальный синтаксис запросов. Примеры:

  • 305 — ищет все посты, содержащие 305, найдет посты про Раунд 305
  • andrew stankevich contests — можно писать сразу много слов, будут искаться все
  • user:mikemirzayanov title:сазанка — ищет все посты в названии со словом "сазанка" авторства MikeMirzayanov
  • "vk cup" — можно использовать кавычку, чтобы искать точные совпадения
  • title:educational — искать в названии

Результаты

1.
VK Cup 2017 Round 3 + Codeforces Round #412 (Div. 1 + Div. 2)
Автор tourist, 9 лет назад, По-русски
VK Cup 2017 Round 3 + Codeforces Round #412 (Div. 1 + Div. 2) Hi everyone! The last elimination round of VK Cup 2017, Round 3, will take place on May 7 at 18:35 MSK ([check your timezone here](https://www.timeanddate.com/worldclock/fixedtime.html?msg=VK+Cup+Round+3&iso=20170507T1835&p1=352&ah=3)), along with separate Codeforces Round #412 for both divisions. All three rounds will be three hours long, and all three rounds will be rated. The contest "VK Cup 2017 — Round 3" is for teams qualified from Round 2 or Wildcard Round 2. The top 20 teams will advance to the final which will be held in July 2017 in Saint Petersburg! Huge thanks to [user:KAN,2017-05-06], [user:qwerty787788,2017-05-06], [user:PavelKunyavskiy,2017-05-06], [user:AlexFetisov,2017-05-07], [user:MikeMirzayanov,2017-05-06], and VK company for making this round possible. Codeforces will be the main character of most problems. Don't forget that it's useful to read the statements of all the problems. Good luck! As we're in year 2017, the scoring will obviously be stat...
Cup 2017 — Round 3" is for teams qualified from Round 2 or Wildcard Round 2. The top 20 teams will, The contest "VK Cup 2017 — Round 3" is for teams qualified from Round 2 or Wildcard Round 2. The

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2.
Codeforces Round 923 (Div. 3)
Автор MikeMirzayanov, 3 года назад, По-английски
Codeforces Round 923 (Div. 3) Gamarjoba, Codeforces! On [contest_time:1927] will start [contest:1927], the next Codeforces round for the Div.3. Lately, I've been coming up with problem ideas less frequently, but I don't want to lose this skill. Welcome to the round where all problems are my own creation! I hope you'll enjoy them. A huge thank you to [user:Vladosiya,2024-02-05] for preparing the majority of problems in Polygon. Also, thanks to [user:pashka,2024-02-05] and [user:KAN,2024-02-06] for helping with the discussion of problem ideas. Thank you very much [user:74TrAkToR,2024-02-05], [user:CLown1331,2024-02-05], [user:EternalAlexander,2024-02-05], [user:Jostic11,2024-02-05], [user:Killever,2024-02-05], [user:KoT_OsKaR,2024-02-05], [user:LoveWX,2024-02-05], [user:MADE_IN_HEAVEN,2024-02-05], [user:dan_dolmatov,2024-02-05], [user:jnmtz111__,2024-02-05], [user:pedrolino,2024-02-05], [user:theRealChainman,2024-02-05], [user:yorky,2024-02-05] for testing the round. As usual for the Div.3 rounds: ...
compulsory measure to combat unsporting behavior. To qualify as a trusted participant of the third division, , this is a compulsory measure to combat unsporting behavior. To qualify as a trusted participant of the

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3.
Evidence of ACPC Corruption
Автор ACPC_Corruption, история, 6 лет назад, По-английски
Evidence of ACPC Corruption This blog is about ACPC corruption, ACPC is the ICPC regional contest for students competing in Africa and the Arab region. Sorry for posting this from a fake account, but as you will see in the video our team can be disqualified in case we used our real accounts! We believe that ACPC is corrupted and in this video, we have included some evidence of this corruption <iframe width="560" height="315" src="https://www.youtube.com/embed/sPZGx9uXEC8" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe> FB Page: https://www.facebook.com/ACPC-Corruption-104279088364028 We are students, we can’t afford to pay **$1500** (the mandatory participation fees). We don’t understand why we are the only region where students have to pay these huge sums. All we want is a normal contest that students can afford its fees like any other region. ACPC has set a deadline for paying the fees on **15/02** and ...
till now there are many qualified teams that can’t afford these fees so this might be the last, ACPC has set a deadline for paying the fees on **15/02** and till now there are manyqualified

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4.
A summary of what passes for an Indian ICPC Contest, apparently
Автор shiven, история, 21 месяц назад, По-английски
A summary of what passes for an Indian ICPC Contest, apparently The online round for the India’s ICPC was held on 23rd. And also a week before that. The first time around, the organisers tried debuting a self-hosted DOMjudge instance. That didn’t go too well, so a recontest was scheduled on CodeChef. If you’re not too familiar with the Indian ICPC system — this online prelims is used to select teams that can participate in the offline regionals. From a single university, usually approx. 2 teams (for the top unis) or 1 (for almost all unis that aren’t in top-15) qualify. As you could guess, it’s quite easy for good teams to miss a spot. Looking at the first contest’s rankings, teams from rank 2 to 100+ all had 4 solves. Owing to severe system issues in the first contest, the time penalties weren’t too reliable differentiators, leading to the recontest this Saturday. In hindsight, we forgot to be grateful for the problemset and reliable testcases the first time. I’m sure everyone agrees that the basic requirements (ignoring all other stuff...
(for the top unis) or 1 (for almost all unis that aren’t in top-15) qualify., top-15) qualify. As you could guess, it’s quite easy for good teams to miss a spot. Looking at

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5.
Codeforces Round #842 (Div.2)
Автор thanhchauns2, история, 4 года назад, По-английски
Codeforces Round #842 (Div.2) Hi Codeforces! ================== [user:Igorfardoc,2020-01-05], [user:Vladithur,2020-02-09], [user:alexdat2000,2019-08-18], [user:gluchie,2021-03-10], [user:DeMen100ns,2020-09-19], [user:Spyofgame,2021-10-03] and me (spelling "thanh-chau-n-s-2") are delighted to invite you to participate in [Codeforces Round #842 (Div. 2)](https://codeforces.me/contests/1768). **This round will be rated for all participants with a rating lower than 2100.** - Start time: [contest_time:1768] - Duration: **120 minutes**. - Number of tasks: **6**. <img align="right" src="https://media.discordapp.net/attachments/961567157622276126/1056248841348841594/received_3472327789705304.webp?width=541&height=676" width="30%" height="40%"> <spoiler summary="This contest is brought to you by"> - <a href = "https://www.facebook.com/HocvienPTIT">PTIT</a>, my university. - <a href = "https://discord.gg/codemely">Code Mely</a>, a Vietnamese fanpage for Computer Science. </spoiler> Special thanks to: ...
luckiest. You have to set your region to Vietnam to be qualified.

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6.
The 2023 ICPC World Finals Luxor
Автор ICPCNews, 2 года назад, По-английски
The 2023 ICPC World Finals Luxor <img src="/predownloaded/60/aa/60aa49ecdb6a668539163c4d7d797ac6f1bb43b3.jpg" align="right" style="height: 350px; margin: 10px 20px 20px;" alt="text"/> Hello Codeforces! The 2023 ICPC World Finals Luxor will begin on [April 18, 2024 at 10:00 UTC](https://www.timeanddate.com/worldclock/fixedtime.html?msg=2023+ICPC+World+Finals+Luxor&iso=20240418T12&p1=4626&ah=5). This time, we have a double World Finals. You can distinguish them by colors: blue (fish emoji) and green (crocodile). Join us on the live broadcast for this awesome double event of the year in competitive programming; commentators will include [user:ecnerwala,2024-04-17], [user:SecondThread,2024-04-17], [user:Egor,2024-04-17], and more! ICPC World Finals Luxor is hosted by The Arab Academy for Science, Technology, & Maritime Transport (AASTMT), the ICPC World Finalist teams for two seasons will compete for World Championship awards, prizes, and bragging rights. More than 130 teams of each season represent the best of gr...
Teams qualified to ICPC WF Luxor:

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7.
EPIC Institute of Technology Round Summer 2025 (Codeforces Round 1036, Div. 1 + Div. 2)
Автор Proof_by_QED, 14 месяцев назад, По-английски
EPIC Institute of Technology Round Summer 2025 (Codeforces Round 1036, Div. 1 + Div. 2) # Hello Codeforces Once Again <img alt="" src="https://codeforces.me/predownloaded/4e/71/4e713a365fc86888c808b3b56d6fecfb529973e6.png" style="float:right; height: 154px; padding-left: 35px; padding-right: 73px; padding-top: 41px; padding-bottom: 33px;"/> After months of hard work, [user:cry,2025-07-01], [user:Lilypad,2025-07-01] and I are extremely proud to welcome you to participate in [contest:2124] at [contest_time:2124]. This round is combined for Division 1 and Division 2, and it will be rated for everyone. You will be given $3$ hours to solve $9$ problems. One problem will be split into two subtasks. We would like to thank the following people for making the contest possible: - [user:satyam343,2025-07-01] for outstanding coordination, working tirelessly with us to improve problem quality and donating his own problems to us. I cannot thank him enough. - [user:Error_Yuan,2025-07-01] for proposing some ideas that weren't used in the end. - [user:Benq,2025-07-01...
pass any single exam to qualify! — If you don't succeed on one date, you can try

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8.
Codeforces Round #547 (Div. 3)
Автор MikeMirzayanov, 7 лет назад, По-русски
Codeforces Round #547 (Div. 3) Hello, Codeforces! I am pleased to invite you to [contest:1141], which will start on [contest_time:1141]. Everyone whose current rating is strictly less than 1600 is invited to participate officially. All others can take part out of the competition. It so happened that the schedule of this month is not replete with rounds (coordinators, we hope for you!). Therefore I decided to partially correct the situation. All the problems of this round were invented and prepared by me on the last day of [Hello Muscat Programming Bootcamp 2019] (/blog/entry/63298) and on flights from Muscat to St. Petersburg. I even specially noted the time for preparation: for the current moment (the problems are ready for testing) I spent about 6 hours on their preparation, including inventing some of the problems. I really like working on problems, this is something at the intersection of creativity and programming. I really hope you enjoy the result of my work. <center> <br/> <img src = "/predownload...
for combating unsporting behavior. To qualify as a trusted participants of the third division

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9.
Codeforces Round 1050 (Div. 4)
Автор cry, 12 месяцев назад, По-английски
Codeforces Round 1050 (Div. 4) <center> <img src="https://codeforces.me/predownloaded/aa/9f/aa9f258454379845a0619839fde95151d3902e8f.png" style="width:100px;"/> </center> <div class="youtube-container" style="float:right; margin:0 1em 1em 1em; text-align:center;"> <iframe width="315" height="560" src="https://www.youtube.com/embed/VK969nPLEcc" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" allowfullscreen></iframe> </div> I am extremely delighted to invite you to participate in my first solo round, [contest:2148], starting on [contest_time:2148]. There will be $7$ problems to be solved in $2$ hours and $15$ minutes. The format of the event will be identical to Div. 3 rounds: - ICPC rules with a penalty of 10 minutes for an incorrect submission; - 12-hour phase of open hacks after the end of the round (hacks do not give additional points) - after the end of the open hacking phase, all so...
. This is a forced measure for combating unsporting behavior. To qualify as _a trusted participant

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10.
FAQ, Advice & AMA
Автор bashkort, 16 месяцев назад, По-английски
FAQ, Advice & AMA This post assumes you're super ambitious. But don't take any advice too seriously -- we're all different. This is simply what worked for me and might work for you. Choose your own path. #### Useful Links - [LI2 Contests](https://codeforces.me/blog/entry/131164) -- used this course when I was starting out. - [usaco.guide](usaco.guide) -- a collection of great articles & problems on almost all topics. - [OI Checklist](https://docs.google.com/spreadsheets/d/15b1ZaP1owTfTcA4vQ69A5S_wUd_vJmM8Slwu6FiWgP4/edit?usp=sharing) -- my OI Checklist. - [Pavel Mavrin's youtube channel](https://www.youtube.com/channel/UC9WDkCyUlNTncq1Y-mFSgLQ) -- watched his great lectures when I was younger :) - [qoj.ac](qoj.ac), [loj.ac](loj.ac), [dmoj.ca](dmoj.ca), [oj.uz](dmoj.ca), ... #### How do I start? **Advice:** join a great community (school, club, ...), try solving problems, and find someone who can answer your silly questions. I wouldn't have started CP if not for my school. Of c...
I did some math until 7th grade (qualified for national junior math olympiad), though didn't

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11.
On "is this greedy or DP", forcing and rubber bands
Автор -is-this-fft-, история, 4 года назад, По-английски
On "is this greedy or DP", forcing and rubber bands #### Introduction When it comes to "problem-solving techniques", there are roughly 3 levels: 1. Concrete algorithms (Kruskal's algorithm, Li-Chao tree, fast Fourier transform) 2. General patterns (dynamic programming, greedy, square-root decomposition) 3. Meta-strategies ("how do I even go about solving this problem?") There is some grey area, but in general this classification works well. [Many tutorials](https://codeforces.me/catalog) have been written about ideas that fall into 1 or 2. But very little has been written about the third category. On the catalog, I think the only blogs that really qualify are [this](62730) and [this](20548). There is also [this](92248?#comment-809401) valuable comment. As to why there is so little written, I think I can identify two reasons. - Most strong contestants don't really consciously think about these. After solving a problem with FFT, it's hard not to know you used FFT. If you used DP, even if you did it without thinki...
blogs that really qualify are [this](62730) and [this](20548). There is also [this](92248?#comment

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12.
IICPC Global Codefest 2026
Автор Dominater069, 8 месяцев назад, По-английски
IICPC Global Codefest 2026 Hello! Registrations for IICPC Global Codefest 2026 are opening soon. This is the first global edition of India's largest offline competitive programming competition. **About IICPC Codefest** IICPC (Intercollegiate Informatic and Competitive Programming Camp) is an academic and industry-backed organization focused on identifying, evaluating, and nurturing high-potential students in competitive programming, algorithms, and computer science fundamentals through rigorously designed, large-scale competitive examinations and camps. We organize Codefest, a multi-stage competitive programming competition conducted across India. This year, we are opening participation to international students from 50+ countries. **The prelims is individual participation, and online for international students. The deadline for registration is 15th January, 23:59 IST**. <img src="https://i.ibb.co/bRJt7y44/codefest-banner.png" height="50"> **Competition Structure** Prelims &mdash; Janua...
Top 5 international performers in prelims qualify directly to Finals with:

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13.
Codeforces Round #764 (Div. 3)
Автор Aris, 5 лет назад, перевод, По-русски
Codeforces Round #764 (Div. 3) Hello! [contest:1624] will start at [contest_time:1624]. You will be offered 7-8 problems with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have a rating of 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ICPC). Thus, solutions will be judged on preliminary tests during the round, and after the round, it will be a 12-hour phase of **open hacks**. You will be given **7-8 problems** and **2 hours and 15 minutes** to solve them. One of the problems in this round is **interactive**. Don't forget to read the [guide on interactive problems](https://codeforces.me/blog/entry/45307). Note that the **penalty** for the wrong submission in this round is **10 minutes**. [Remember](https://codeforces.me/blog/entry/59228) that only the trusted participants of the third division will be included in the official s...
compulsory measure for combating unsporting behavior. To qualify as a _trusted participant of the third

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14.
Codeforces Round 918 (Div. 4)
Автор SlavicG, 3 года назад, По-английски
Codeforces Round 918 (Div. 4) Happy Holidays Codeforces! &#127877; [user:mesanu,2023-12-27], [user:flamestorm,2024-04-22] and I are very excited to invite you to [contest:1915]! It starts on [contest_time:1915]. The format of the event will be identical to Div. 3 rounds: - 5-8 tasks; - ICPC rules with a penalty of 10 minutes for an incorrect submission; - 12-hour phase of open hacks after the end of the round (hacks do not give additional points) - after the end of the open hacking phase, all solutions will be tested on the updated set of tests, and the ratings recalculated - by default, only "trusted" participants are shown in the results table (but the rating will be recalculated for all with initial ratings less than 1400 or you are an unrated participant/newcomer). We urge participants whose rating is 1400+ not to register new accounts for the purpose of narcissism but to take part unofficially. Please do not spoil the contest for the official participants. Only _trusted participants of the f...
. This is a forced measure for combating unsporting behavior. To qualify as _a trusted participant

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15.
CodeChef — ICPC: How hard is it to set a balanced contest?
Автор Ashishgup, история, 8 лет назад, По-английски
CodeChef — ICPC: How hard is it to set a balanced contest? Due to my dislike of CodeChef discuss, I choose to discuss/rant about this topic here on Codeforces. Although non-Indian participants may not relate to the ICPC situation, I'm sure the CookOffs and Lunchtimes are a common issue. First of all, why is the difficulty gradient so fucked up every single time? ([Contest Link](https://www.codechef.com/ACMIND18)). Be it ICPC, or CookOffs, or LunchTimes, the same thing is seen over and over again. Scoreboard for reference: ![ ](https://i.gyazo.com/495d549bc79f3ca5d1cda359e26490ef.png) Secondly, why does online ICPC selection have only 5 questions for 3 hours? Not to mention, 3 of them are pretty hard, and the difficulty drop is huge, so it does not help filter out deserving teams from undeserving ones. Is ICPC selection supposed to be based on a speed typing test? In unbalanced contests like this, it almost always happens that some undeserving teams qualify. Every penalty matters a lot too. For instance, we failed to qualify for ...
almost always happens that some undeserving teams qualify. Every penalty matters a lot too. For, some undeserving teams qualify. Every penalty matters a lot too. For instance, we failed toqualify for

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16.
MIT Mystery Hunt
Автор Um_nik, история, 4 года назад, По-английски
MIT Mystery Hunt Disclaimer: This blog is not about competitive programming; you probably will not learn anything about algorithms and data structures. In other words, it doesn't qualify for [this initiative](https://codeforces.me/blog/entry/110840), but I want to give a link to it anyways because I think it's cool. I love solving problems. No, seriously. I LOVE it. The mindset described in [this blog](https://codeforces.me/blog/entry/91114) is 100% how I feel. But it is not constrained to competitive programming problems. I loved math problems for a much longer time, and physics was somewhere there. But I also love solving puzzles. And playing puzzle games on the computer (well, on consoles). And participating in intellectual games. I am not as good in them as in cp, but it was never about being good for me, I just love the process. And I think that there might be some people with a similar love for puzzles among competitive programmers, this is why I decided to write this blog on CF <s>and no...
about algorithms and data structures. In other words, it doesn't qualify for [this initiative](https

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17.
ACPC 2026 Qualified Teams
Автор ismailfateen, 9 дней назад, По-английски
ACPC 2026 Qualified Teams Hello codeforces! ECPC (Egyptian Collegiate Programming Contest) 2026 has just concluded so I decided to post a blog with the teams qualified to ACPC (Africa and Arab Collegiate Programming Contest) 2026. ACPC will be held in the beginning of December. Congratulations to "Balloons ehh 3awzen 2otat" from AASTMT Cairo for winning ECPC 2026! If your team qualified, kindly put your Country, University (and College if applicable)/Teens, team name, and your teammates' cf profiles and I will add it to the list. Best of luck in ACPC! <h2>ACPC</h2> <table> <tr> <th>Country</th> <th>University</th> <th>Team Name</th> <th>Member 1</th> <th>Member 2</th> <th>Member 3</th> <th>Team Rating</th> </tr> <tr> <td>Egypt</td> <td>AASTMT Cairo</td> <td>Balloons ehh 3awzen 2otat</td> <td><a href="https://codeforces.me/profile/yahia" style="color:#FF8C00;font-weight:bold;">yahia</a></td> <td><a href="https://codeforces.me/profile/AbdelmagedNour" style="color:#FF8C00;font-weig...
ACPC 2026 Qualified Teams, decided to post a blog with the teams qualified to ACPC (Africa and Arab Collegiate Programming, with the teams qualified to ACPC (Africa and Arab Collegiate Programming Contest) 2026. ACPC will be, If your team qualified, kindly put your Country, University (and College if applicable)/Teens, team

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18.
Codeforces Round 1037 (Div. 3)
Автор soullless, история, 14 месяцев назад, По-русски
Codeforces Round 1037 (Div. 3) Hello, Codeforces! I am very excited to invite you to our contest [contest:2126], which starts on [contest_time:2126]. You will be given **7 problems** and **2 hours and 15 minutes** to solve them. The problems were authored by me, [user:__rose,2025-07-15], [user:Pishka12,2025-07-15], [user:Chalishkan,2025-07-15] and [user:I_HATE_MD_DM,2025-07-15] to solve and alter them. The round will be hosted by the rules of educational rounds (extended **ICPC**). Thus, all solutions will be judged on preliminary tests during the round, and after the round, there will be a **12-hour phase** of open hacks. After the open hack phase, all accepted solutions will be rejudged on successful hacks. Also, note that there is no score distribution — rank will be determined by number of problems solved, followed by penalty; wrong submissions will incur the usual penalty of 10 minutes, following the rules of educational rounds. [Remember](https://mirror.codeforces.com/blog/entry/59228) that only t...
a compulsory measure for combating unsporting behavior. To qualify as a trusted participant of the

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19.
ACPC 2025 Qualified Teams List
Автор ismailfateen, 13 месяцев назад, По-английски
ACPC 2025 Qualified Teams List Hello codeforces! ECPC (Egyptian Collegiate Programming Contest) 2025 has just concluded so I decided to post a blog with the teams qualified to ACPC (Africa and Arab Collegiate Programming Contest) 2025. ACPC will be held in the beginning of December. Huge congratulations to "Tamora fel d2e2a 90" from Cairo University &mdash; Faculty of Computers and Artificial Intelligence for winning ECPC 2025!! If your team qualified, kindly put your Country, University (and College if applicable), teamname and your teammates' cf profiles and I will add it to the list. Best of luck in ACPC! University Teams (Details): <table> <tr> <th>Country</th> <th>University</th> <th>Team Name</th> <th>Member 1</th> <th>Member 2</th> <th>Member 3</th> </tr> <tr> <td>Syria</td> <td>Aleppo University</td> <td>Guess The Imposter</td> <td><a href="https://codeforces.me/profile/ApraCadabra" style="color:red;font-weight:bold;">ApraCadabra</a></td> <td><a href="https://codeforces.com...
ACPC 2025 Qualified Teams List, decided to post a blog with the teams qualified to ACPC (Africa and Arab Collegiate Programming, with the teams qualified to ACPC (Africa and Arab Collegiate Programming Contest) 2025. ACPC will be, If your team qualified, kindly put your Country, University (and College if applicable), teamname

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20.
NAC Vlogs | Final Day, Disney World, Qualified to the WF, Won Bronze and South
Автор Shayan, 2 года назад, По-английски
NAC Vlogs | Final Day, Disney World, Qualified to the WF, Won Bronze and South ### First day We have North America Championship from today (May 23rd) to May 28th in Orlando, Florida. This competition is for choosing the teams qualifying to ICPC WF 2024 in Kazakhstan. I will make a vlog for each day. I'm trying to make each one of these vlogs 15 mins. My first try wasn't very successful and the first video is about half an hour. (It was good and I couldn't trim more than this) By the way, we did the real duel with [user:galen_colin,2024-05-24] and we tried to headshot each other using frisbees. We are both alive but injured. Everyday, This post will be updated by the vlog of that day. Hope you'll enjoy, feel free to give me suggestions about the next ones. And definitely wish UMD White luck :) ### Second Day I heard a sad news from Mohamed [user:Bakry,2024-05-25] today. As he said, Iran and Israel cannot attend IOI 2024 onsite and this is told to them about a year ago. I personally don't know what can we do in this situation to prevent such thin...
NAC Vlogs | Final Day, Disney World, Qualified to the WF, Won Bronze and South, some very valuable awards. We got: Qualified to World Final 2024, Astana, Kazakhstan, NAC Bronze, Qualified to World Final 2024, Astana, Kazakhstan, NAC Bronze Medal, South division, J first accept

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21.
Teams Qualified for Africa and Arab Collegiate Programming Championship — ACPC 2023 (+teens)
Автор purp4ever, история, 3 года назад, По-английски
Teams Qualified for Africa and Arab Collegiate Programming Championship — ACPC 2023 (+teens) Hello, Codeforces community! I would like to congratulate all the teams that have qualified for ACPC2023. I'm thrilled to meet and compete with all of you in this year's competition. Since we're approximately a month away from the event, I believe it's a good idea to get to know the participating teams and assess their current levels. It's also a great idea to add them as friends to compete against them virtually in gyms. If you qualified for this year's competition Please comment the following information and I'll update the blog as soon as possible. ( I will make a separate table for teens) - Country - University(!teens) - Team name - Team handles(separated by spaces) I will add the team rating about a week before the competition as there might be some new grandmasters by then :) Finally, "Welcome to ACPC" And good luck to all the teams! ACPC Teams ------------------ | **#** | **Country** | **University** | **Team name** | **...
Teams Qualified for Africa and Arab Collegiate Programming Championship — ACPC 2023 (+teens), Hello, Codeforces community! I would like to congratulate all the teams that havequalified for, I would like to congratulate all the teams that have qualified for ACPC2023. I'm thrilled to meet, If you qualified for this year's competition Please comment the following information and I'll

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22.
The 2nd Universal Cup Semifinal & 2024 Summer Summit Announcement
Автор chenjb, 2 года назад, По-английски
The 2nd Universal Cup Semifinal & 2024 Summer Summit Announcement <center> <img src="/predownloaded/a6/3b/a63b8b0dc4b18f3e18c316abc22d4677aa075fd8.png" style="height: 262.0px;max-width: 100.0%;max-height: 100.0%;"> </center> **UPD:** **We plan to host the 2024 Universal Cup Summer Summits in Cancún, Mexico. The event has been scheduled from June 19 to June 23. The detailed schedule, materials, and list of the invited teams will be announced in the future. The 2nd Universal Cup Semifinals will be held on June 23, 2024. The contest will start at 17:00 (UTC +8) and end at 22:00 (UTC +8). Please note that there will be no extra time windows on the semifinals contest &mdash; all the teams must start in the only official time window. You may check the event time on your local timezone here: [Link](https://www.timeanddate.com/worldclock/fixedtime.html?msg=The+2nd+Universal+Cup+Semifinals&iso=20240623T17&p1=33&ah=5). The onsite participants will participate in the semifinals on June 22nd (one day before the online participants)** Hello everyone, w...
. This applies to teams that submitted at least one contest but didn't qualify in Part 1. The

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23.
I have solved problems on Codeforces for 500 days in a row
Автор catgirl, 9 месяцев назад, По-английски
I have solved problems on Codeforces for 500 days in a row It's been a while since I started my journey into competitive programming and in this year and (almost) a half I would say that I learned a bit not only about problem solving but also about myself, so I wanted to share my reflections on some mental aspects of practicing competitive programming hoping they can help someone else. Please note that these reflections are merely personal and mostly stem from personal experience, if you disagree with something I would like to know your point of view! I would also like to thank [user:Intellegent,2025-12-08], [user:turska,2025-12-08] and [user:LMeyling,2025-12-08] for proofreading. ![ ](/predownloaded/07/0b/070b72002cfad69b15bb24a5a086d9b8466bcb96.png) #### Some background I used to do math olympiads for 8 years before starting university, in hindsight I did not really like it that much since I never practiced on my own and would've rather played League of Legends / Minecraft / VALORANT or whatever game I was obsessed at the time. ...
I also recently failed to qualify for EUC2025, which is a bit (very) sad since I didn't meet my

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24.
Codeforces Round 1034 (Div. 3)
Автор reirugan, 14 месяцев назад, По-английски
Codeforces Round 1034 (Div. 3) Hello, Codeforces! ================== I am very excited to invite you to my first-ever contest, [contest:2123], which will start on [contest_time:2123]! In this contest, you will be given **2 hours and 15 minutes** to solve **7 problems**. The round will be hosted by the rules of educational rounds (extended ICPC). Thus, all solutions will be judged on preliminary tests during the round, and after the round, there will be a 12-hour phase of **open hacks**. After the open hack phase, all accepted solutions will be rejudged on successful hacks. Also, note that there is no score distribution &mdash; rank will be determined by number of problems solved, followed by penalty; wrong submissions will incur the usual penalty of **10 minutes**, following the rules of educational rounds. [As a reminder](https://codeforces.me/blog/entry/59228), only trusted participants of the third division will be included in the official standings table. This is a compulsory measure for combating unspo...
unsporting behavior. To qualify as a trusted participant of the third division, you must:

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25.
Codeforces Round #656 (Div. 3)
Автор vovuh, история, 6 лет назад, По-русски
Codeforces Round #656 (Div. 3) &lt;too-old-joke-about-copy-paste&gt; Hello! [contest:1385] will start at [contest_time:1385]. You will be offered 6 or 7 problems (or 8) with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have rating 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ACM-ICPC). Thus, during the round, solutions will be judged on preliminary tests, and after the round it will be a 12-hour phase of open hacks. I tried to make strong tests &mdash; just like you will be upset if many solutions fail after the contest is over. You will be given 6 or 7 (or 8) problems and 2 hours to solve them. Note that **the penalty** for the wrong submission in this round (and the following Div. 3 rounds) is **10 minutes**. [Remember] (/blog/entry/59228) that only the <i>trusted participants of the third division</i> will be included i...
for combating unsporting behavior. To qualify as a trusted participants of the third division

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26.
ICPC 2023–2024, Northern Eurasia Finals 2023 has concluded
Автор orz, история, 3 года назад, По-английски
ICPC 2023–2024, Northern Eurasia Finals 2023 has concluded The ICPC Northern Eurasia Finals (a.k.a. Northern Eurasia Regional Contest) took place on 13 December 2023. The onsite participants competed on four venues: [St. Petersburg, Russia](https://neerc.ifmo.ru/regional/nef-2023.html#@h2-spb); [Novosibirsk, Russia](https://neerc.ifmo.ru/regional/nef-2023.html#@h2-nsk); [Astana, Kazakhstan](https://neerc.ifmo.ru/regional/nef-2023.html#@h2-kz); and [Kutaisi, Georgia](https://neerc.ifmo.ru/regional/nef-2023.html#@h2-geo). Congratulations to the [medalists](https://neerc.ifmo.ru/archive/2023/standings.html) of the contest: |-| | **Rank** | **Team** | **=** | **Time** | | &#127942; 1 | MIPT: Yolki-palki ([user:Pechalka,2023-12-14], [user:Tikhon228,2023-12-14], [user:Kapt,2023-12-14]) | 12 | 1266 | | &#129351; 2 | HSE: Youthful Passion Fruit ([user:alexxela12345,2023-12-14], [user:Allvik06,2023-12-14], [user:talant,2023-12-14]) | 10 | 982 | | &#129351; 3 | SPb ITMO: pengzoo ([user:iakovlev.zakhar,2023-12-14], [user:golikovnik,2023-12-14],...
As a result, several teams qualified for the ICPC Finals, which will be held in 2024 in Astana

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27.
Calling CF Community to Support Rescheduling ACPC
Автор Satoru, 3 года назад, По-английски
Calling CF Community to Support Rescheduling ACPC **UPD: it's now rescheduled! thank you all for the support.** Hello Codeforces, I didn't want to publish this blog during these circumstances, as it's the last thing to care about, but I'm publishing it hopefully ACPC organizers see it. Last Saturday, we got an email saying that the ICPC world finals, which were supposed to be in 11 days in Sharm El-Sheikh, got rescheduled to a later time. And it was expected that the ACPC, which is supposed to be in 17 days in the same hotel, would get rescheduled too. but apparently the competition is still on its previously scheduled date!! I would like to note that ACPC is scheduled to be in the same hotel as ICPC. Let's talk about it from many perspectives. From the travel perspective, sadly while talking I will partition Palestine into the West Bank and Gaza, but we're one nation and stand together with each other. Firstly, two teams from Gaza are supposed to participate in ACPC this year, and surely, they will not be able to co...
than seven Palestinian teams from the West Bank who qualified to ACPC and will not be able to travel

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28.
Rayan 2024 Selection Round (Div. 1 + Div. 2, Rated, Prizes!)
Автор ArshiaDadras, 21 месяц назад, По-английски
Rayan 2024 Selection Round (Div. 1 + Div. 2, Rated, Prizes!) &#128075; Salam, Codeforces! ------------------ <img src="/predownloaded/10/20/1020443c4ada8a8d0aeaa46f6dd4a34120fe8030.png" style="width: 30.0%;float: right;margin: 0 0.5em 0.5em 0.5em;max-width: 100.0%;max-height: 100.0%;"> We are thrilled to invite you to the [contest:2034]. The **Selection Round** is a rated contest for Div. 1 + Div. 2, taking place on [contest_time:2034]. The problems for this round were crafted and prepared by [user:ArshiaDadras,2024-11-19], [user:MohammadParsaElahimanesh,2024-11-19], [user:AmShZ,2024-11-19], [user:AmirrzwM,2024-11-19], and [user:Keshi,2024-11-19]. The **top 60 trusted participants** (with a maximum of three from each country) will qualify for the onsite **Final Round** in Tehran, in Spring 2025. An additional quota is reserved for the host country. Hotel accommodation, local transportation, and meals will be provided to all finalists. More details about the final contest will be available on the [Rayan](https://rayan.global/) website. ...
The **top 60 trusted participants** (with a maximum of three from each country) willqualify for

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29.
An archive of old USACO Problems
Автор Qingyu, 5 лет назад, По-английски
An archive of old USACO Problems As we know, USACO is a competitive programming contest primarily for secondary school students in the US. It offers a large collection of excellent problems, from the easy to the difficult. Many of the problems are educational and worthwhile as training material. However, the official website only offers problems from as early as 2011, and older problems are hard to find. Some of the Online Judges, such as POJ, contain some of the problems, but they are not properly filed together, and it's difficult to find the corresponding solution and test data. In this post, I will try to list all the USACO materials that I have found so far. Most of the materials come from some old websites, and thanks to the efforts of web.archive.org, we can check out old websites that no longer exist. In addition, many of the problems were used as training materials in the training of Chinese IOI teams about 20 years ago. These materials have been preserved and are available through some Chinese websit...

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30.
Invitation to Codeforces Round 962 (Div. 3)
Автор cry, 2 года назад, По-английски
Invitation to Codeforces Round 962 (Div. 3) <center> Hewwo Cowodeforcers! ------------------ </center> [user:sum,2024-07-04] and I are overjoyed to welcome you to participate in [contest:1996] on [contest_time:1996]. This contest is the last stop on our mission to problemset for every division. We hope you've been enjoying our stuff so far! The round will be hosted by rules of educational rounds (extended ICPC). Thus, solutions will be judged on preliminary tests during the round, and after the round, it will be a 12-hour phase of **open hacks**. After open hacks all accepted solutions will be rejudged on successful hacks. You will be given **7 problems** and **2 hours and 15 minutes** to solve them. Note that the **penalty** for each wrong submission in this round is **10 minutes**. [Remember](https://codeforces.me/blog/entry/59228) that only the trusted participants of the third division will be included in the official standings table. As it is written by link, this is a compulsory measure for combating unsp...
compulsory measure for combating unsporting behavior. To qualify as a _trusted participant of the third

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31.
Codeforces Round 952 (Div. 4)
Автор cry, 2 года назад, По-английски
Codeforces Round 952 (Div. 4) <center> Hellowo Codeforcers :3 ------------------ </center> [user:sum,2024-06-08] and I are very delighted, ecstatic, enchanted, euphoric, excited, exultant, jubilant, overjoyed, and proud to invite you to participate in [contest:1985], which will start on [contest_time:1985]. There will be $8$ problems, with one split into two subtasks, to be solved in $2.5$ hours. As usual, I have to copy and paste the following... The format of the event will be identical to Div. 3 rounds: - 5-8 tasks; - ICPC rules with a penalty of 10 minutes for an incorrect submission; - 12-hour phase of open hacks after the end of the round (hacks do not give additional points) - after the end of the open hacking phase, all solutions will be tested on the updated set of tests, and the ratings recalculated - by default, only "trusted" participants are shown in the results table (but the rating will be recalculated for all with initial ratings less than 1400 or you are an unrated participant/ne...
. This is a forced measure for combating unsporting behavior. To qualify as _a trusted participant

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32.
Educational Codeforces Round 156 [Rated for Div. 2]
Автор awoo, история, 3 года назад, По-русски
Educational Codeforces Round 156 [Rated for Div. 2] Hello Codeforces! On [contest_time:1886] [contest:1886] will start. Series of Educational Rounds continue being held as [Harbour.Space University](https://harbour.space/) initiative! You can read the details about the cooperation between [Harbour.Space University](https://harbour.space/) and Codeforces in the <a href="https://mirror.codeforces.com/blog/entry/51208">blog post</a>. This round will be **rated for the participants with rating lower than 2100**. It will be held on extended ICPC rules. The penalty for each incorrect submission until the submission with a full solution is 10 minutes. After the end of the contest, you will have 12 hours to hack any solution you want. You will have access to copy any solution and test it locally. You will be given **6 or 7 problems** and **2 hours** to solve them. The problems were invented and prepared by Adilbek [user:adedalic,2023-10-08] Dalabaev, Ivan [user:BledDest,2023-10-08] Androsov, Maksim [user:Neon,2023-10-08] Mesch...
Note: These scholarships are only available for qualified applicants with a bachelor’s degree.

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33.
From 0 to ICPC in 1 Year
Автор Wxssim, 21 месяц назад, По-английски
From 0 to ICPC in 1 Year **Welcome to my first blog!!** <br> &nbsp;&nbsp;&nbsp;&nbsp; I'll be sharing my journey in the cp world and how I managed to qualify to ICPC 1 year and 3 months (sorry for the clickbait) into my cp career. If you're curious what it took to achieve this, or if you're looking for some motivation or inspiration, this blog is for you :) <br> A special thank you to [user:alnq417,2024-12-12] for helping me cook this blog <3 <br><br> ### _Starting My CP Career:_ _LCPC 2023 Fail_ &nbsp;&nbsp;&nbsp;&nbsp; One month before LCPC 2023 (Lebanese Collegiate Programming Contest), my university informed me about the competition. I was a second year student at that time so I quickly formed a team and registered, not knowing anything about the competition at all. I had high hopes, thinking it would be something similar to what I was studying at university and I assumed I'd do well. <br><br> &nbsp;&nbsp;&nbsp;&nbsp; Fast forward a month, I solved the easiest 4 problems in the competition and r...
cp world and how I managed to qualify to ICPC 1 year and 3 months (sorry for the clickbait) into my, meant that we qualified to ACPC 2024!!, medal—and most importantly, we qualified for the ICPC World Finals!!

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34.
How might LGMs cheat using current AI. Or, are these not cheating?
Автор arvindf232, история, 2 года назад, По-английски
How might LGMs cheat using current AI. Or, are these not cheating? Disclaimer: My natural English ability is questionable. I have passed the blog through chatgpt to correct grammatical mistakes. I experimented with o1-mini and tried to understand its implications for competitive programming on Codeforces at level 2500 or higher. Obviously, the current AI cannot outright provide you with solutions; however, there are already ways it can help quite a lot. ### Brute Force Writing I believe most competitors regularly use brute-forces. They are kind of an admission of failure to find your mistakes on your own. Previously, brute-forces came with the cost of taking 5 minutes to write. I would not do it unless it is a very hard problem, or I have tried debugging by hand for 10 minutes and seen nothing. If AI usage is assumed, then these 5 minutes would be completely saved. Five minutes would correspond to approximately a 10 performance rating if on the final problem and increasingly more on earlier problems. ### Translations of Languages Thi...
I realized I am not qualified to judge and make the verdict, and my current opinion is, "I don't

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35.
MIT Informatics Tournament 2025 Spring Invitational
Автор antontrygubO_o, 18 месяцев назад, По-английски
MIT Informatics Tournament 2025 Spring Invitational **Update (5/8):** The Finals Round has concluded (here are links to [gym](https://codeforces.me/gym/105870/standings) & [editorial](https://codeforces.me/gym/105870/attachments/download/31412/MITIT_2025_Finals_Editorial.pdf)). Editorials and problems for [Qualification Round 1](https://codeforces.me/gym/105822) and [Qualification Round 2](https://codeforces.me/gym/105837) are in the gym. Congratulations to all of our finalists! 1. [user:hos.lyric,2025-05-09] (405, 13:32:43) &mdash; $1500 2. [user:tourist,2025-05-09] (400, 05:50:33) &mdash; $1000 3. [user:benq,2025-05-09] (340, 05:41:11) &mdash; $500 4. [user:A_G,2025-05-09] (310, 05:52:27) 5. [user:Kevin114514,2025-05-09] (310, 09:29:36) 6. [user:ksun48,2025-05-09] (305, 06:32:42) 7. [user:gamegame,2025-05-09] (305, 06:51:14) 8. [user:rainboy,2025-05-09] (305, 07:16:58) 9. [user:jeroenodb,2025-05-09] (300, 04:57:25) 10. [user:errorgorn,2025-05-09] (300, 05:51:34) 11. [user:ecnerwala,2025-05-09] (300, 05:53:09) 12. ...
Round. The top 400 from Qualification Round 1 will qualify to Qualification Round 2., The top 16 US and top 8 international contestants will qualify for the Final Round on May 3rd. The

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36.
Educational Codeforces Round 142 [Rated for Div. 2]
Автор awoo, история, 4 года назад, По-русски
Educational Codeforces Round 142 [Rated for Div. 2] Hello Codeforces! On [contest_time:1792] [contest:1792] will start. Series of Educational Rounds continue being held as [Harbour.Space University](https://harbour.space/) initiative! You can read the details about the cooperation between [Harbour.Space University](https://harbour.space/) and Codeforces in the <a href="http://codeforces.me/blog/entry/51208">blog post</a>. This round will be **rated for the participants with rating lower than 2100**. It will be held on extended ICPC rules. The penalty for each incorrect submission until the submission with a full solution is 10 minutes. After the end of the contest, you will have 12 hours to hack any solution you want. You will have access to copy any solution and test it locally. You will be given **6 or 7 problems** and **2 hours** to solve them. The problems were invented and prepared by Adilbek [user:adedalic,2023-01-23] Dalabaev, Vladimir [user:vovuh,2023-01-23] Petrov, Ivan [user:BledDest,2023-01-23] Androsov, Ma...
teams who already qualified for the world finals ICPC or are aiming that high._ - _**Division B

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37.
FHC 2017 Finalists
Автор rng_58, история, 10 лет назад, По-английски
FHC 2017 Finalists UPD: The contest is at https://www.facebook.com/hackercup/round/1799632126966939/. I barely qualified, so I do this again. <table border="1" width="400" cellspacing="0" cellpadding="5" bordercolor="#333333"> <tr> <th bgcolor="#EE0000"><font color="#FFFFFF">CF Handle</font></th> <th bgcolor="#EE0000"><font color="#FFFFFF">Country</font></th> </tr> <tr><td>1. [user:Egor,2017-01-29]</td><td>Russia</td></tr> <tr><td>2. [user:scott_wu,2017-01-29]</td><td>United States</td></tr> <tr><td>3. [user:RomaWhite,2017-01-29]</td><td>Ukraine</td></tr> <tr><td>4. [user:Petr,2017-01-29]</td><td>Russia</td></tr> <tr><td>5. [user:tourist,2017-01-29]</td><td>Belarus</td></tr> <tr><td>6. [user:jcccccccccccccccccccccsb,2017-01-29]</td><td>China</td></tr> <tr><td>7. [user:Eryx,2017-01-29]</td><td>Poland</td></tr> <tr><td>8. [user:Errichto,2017-01-29]</td><td>Poland</td></tr> <tr><td>9. [user:qwerty787788,2017-01-29]</td><td>Ukraine</td></tr> <tr><td>10. [user:dotorya,2017-01-29]</td><td...
I barely qualified, so I do this again.

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38.
The 2025 ICPC World Finals Baku
Автор ICPCNews, 12 месяцев назад, По-английски
The 2025 ICPC World Finals Baku Salam Codeforces! We are glad to invite you to follow the 2025 ICPC World Finals in Baku, Azerbaijan! <img alt="ICPC WF Baku" src="/predownloaded/e0/0c/e00c1cbead88d5c3243220a3b8331768ff4b7040.png" style="height: 300.0px;max-width: 100.0%;max-height: 100.0%;" align="center"> The event will mark the conclusion of the 2024–2025 ICPC season. Near the 140 university teams from different countries will join the finals. After many regional contests, they will now meet in Baku to fight for the title of ICPC World Champion at the 49th ICPC World Finals. The 2025 ICPC World Finals Baku will start on [September 4, 2025 at 11:00 (UTC+4)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=The+2025+ICPC+World+Finals+Baku&iso=20250904T11&p1=369). We invite everyone to join the live broadcast of the biggest programming event of the year! Teams qualified to ICPC WF Baku: - [Official list](https://icpc.global/worldfinals/teams) - [Non-official list with CF rating](https://cod...
Teams qualified to ICPC WF Baku:

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39.
VK Cup 2017 Round 1 and CF Round 405 div1+div2
Автор Errichto, 9 лет назад, перевод, По-русски
VK Cup 2017 Round 1 and CF Round 405 div1+div2 Hello. The round 1 of VK Cup 2017 will take place on March 18 at 18:35 MSK (check your timezone [here](https://www.timeanddate.com/worldclock/fixedtime.html?day=18&month=3&year=2017&hour=18&min=35&sec=0&p1=166)), along with standard div1+2 Codeforces Round \#405. The contest "VK Cup 2017 &mdash; Round 1" is for teams qualified from two Qualification Rounds. The top 400 teams will advance to the Round 2, while other ones will have one more chance in the Wild Card Round 1 in April. Those who don't participate in the VK Cup can take part in the Codeforces Round \#405 individually (problems will be available in English too). All three rounds last 2 hours, and all are rated. I want to thank: [user:KAN,2017-03-17] for his help in the contest preparation, [user:MikeMirzayanov,2017-03-17] that we are here, [user:AlexFetisov,2017-03-17] for testing, the VK company for this nice annual contest. I'm a setter and I hope (and expect?) that you will enjoy the problems. During the conte...
" is for teams qualified from two Qualification Rounds. The top 400 teams will advance to the Round, ; Round 1" is for teams qualified from two Qualification Rounds. The top 400 teams will advance to

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40.
Educational Codeforces Round 150 [Rated for Div. 2]
Автор awoo, история, 3 года назад, По-русски
Educational Codeforces Round 150 [Rated for Div. 2] Hello Codeforces! On [contest_time:1841] [contest:1841] will start. Series of Educational Rounds continue being held as [Harbour.Space University](https://harbour.space/) initiative! You can read the details about the cooperation between [Harbour.Space University](https://harbour.space/) and Codeforces in the <a href="http://mirror.codeforces.com/blog/entry/51208">blog post</a>. This round will be **rated for the participants with rating lower than 2100**. It will be held on extended ICPC rules. The penalty for each incorrect submission until the submission with a full solution is 10 minutes. After the end of the contest, you will have 12 hours to hack any solution you want. You will have access to copy any solution and test it locally. You will be given **6 or 7 problems** and **2 hours** to solve them. The problems were invented and prepared by Adilbek [user:adedalic,2023-06-11] Dalabaev, Ivan [user:BledDest,2023-06-11] Androsov, Maksim [user:Neon,2023-06-11] Mesche...
aspiring and eligible ICPC candidates. We qualified 2 times for the ICPC world finals and it is only

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41.
Invitation to CodeChef SnackDown Elimination and Parallel Rated Contests
Автор antontrygubO_o, 5 лет назад, По-английски
Invitation to CodeChef SnackDown Elimination and Parallel Rated Contests We are very glad to invite you to participate in [SnackDown Elimination round](https://www.codechef.com/SNCKEL21)! It will be **rated** for all participants. 60 participants will qualify for the finals from the Elimination round. They include: <ul> <li>The top 25 participants from the Elimination round.</li> <br> <li>Additional top 2 school participants </li> <br> <li>Additional top 2 female participants </li> <br> <li>Additional 31 Indian participants, including: <ul> <li> 10 top Indian participants </li> <br> <li> The next 15 Indian participants from the Elimination Round qualify provided they solve at least 2 problems. </li> <br> <li> 3 top Indian School participants</li> <br> <li> 3 top Indian Female participants </li> </ul> </li> </ul> Those, who haven't advanced, are invited to participate in the [Parallel rounds](https://www.codechef.com/SDELP21), which will be held for all divisions. All three rounds are **rated** too. [Time: 7:30 PM ...
60 participants will qualify for the finals from the Elimination round. They include:, > The next 15 Indian participants from the Elimination Round qualify provided they solve at least 2, Users who have qualified to participate in the SnackDown Elimination should not participate in the

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42.
Codeforces Round 1042 (Div. 3)
Автор __baozii__, 13 месяцев назад, По-английски
Codeforces Round 1042 (Div. 3) Hello Codeforces! We are glad to invite you to participate in [contest:2131], which will start on [contest_time:2131]. You will be given **2 hours and 15 minutes** to solve **8** problems. The problems are authored and prepared by [user:-firefly-,2025-08-07], [user:efishel,2025-08-07], [user:Tobo,2025-08-07], and [user:__baozii__,2025-08-07]. The round will be hosted by the rules of educational rounds (extended ICPC). Thus, all solutions will be judged on preliminary tests during the round, and after the round, there will be a 12-hour phase of **open hacks**. After the open hack phase, all accepted solutions will be rejudged on successful hacks. Also, note that there is no score distribution &mdash; rank will be determined by number of problems solved, followed by penalty; wrong submissions will incur the usual penalty of **10 minutes**, following the rules of educational rounds. [As a reminder](https://codeforces.me/blog/entry/59228), only trusted participants of the th...
unsporting behavior. To qualify as a trusted participant of the third division, you must:

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43.
Codeforces Round #784 (Div. 4)
Автор mesanu, 4 года назад, По-английски
Codeforces Round #784 (Div. 4) Hello Codeforces! [user:SlavicG,2022-04-19], [user:flamestorm,2022-04-19], [user:MikeMirzayanov,2022-04-19], [user:Errichto,2022-04-19], and I want to invite you to the long-awaited second Div. 4 round! It starts on [contest_time:1669]. The format of the event will be identical to Div. 3 rounds: - 5-8 tasks; - ICPC rules with a penalty of 10 minutes for an incorrect submission; - 12-hour phase of open hacks after the end of the round (hacks do not give additional points) - after the end of the open hacking phase, all solutions will be tested on the updated set of tests, and the ratings recalculated - by default, only "trusted" participants are shown in the results table (but the rating will be recalculated for all with initial ratings less than 1400 or you are an unrated participant/newcomer). We urge participants whose rating is 1400+ not to register new accounts for the purpose of narcissism but to take part unofficially. Please do not spoil the contest for the off...
. This is a forced measure for combating unsporting behavior. To qualify as _a trusted participant

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44.
Educational Codeforces Round 148 [Rated for Div. 2]
Автор awoo, история, 3 года назад, По-русски
Educational Codeforces Round 148 [Rated for Div. 2] Hello Codeforces! On [contest_time:1832] [contest:1832] will start. Series of Educational Rounds continue being held as [Harbour.Space University](https://harbour.space/) initiative! You can read the details about the cooperation between [Harbour.Space University](https://harbour.space/) and Codeforces in the <a href="http://mirror.codeforces.com/blog/entry/51208">blog post</a>. This round will be **rated for the participants with rating lower than 2100**. It will be held on extended ICPC rules. The penalty for each incorrect submission until the submission with a full solution is 10 minutes. After the end of the contest, you will have 12 hours to hack any solution you want. You will have access to copy any solution and test it locally. You will be given **6 or 7 problems** and **2 hours** to solve them. The problems were invented and prepared by Adilbek [user:adedalic,2023-05-11] Dalabaev, Ivan [user:BledDest,2023-05-11] Androsov, Maksim [user:Neon,2023-05-11] Mesche...
for qualified participants._

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45.
Codeforces Round 1012 (Div.1, Div. 2, based on THUPC 2025 — Finals)
Автор fengzhengwei, 17 месяцев назад, По-английски
Codeforces Round 1012 (Div.1, Div. 2, based on THUPC 2025 — Finals) There will, and there shall be a THU round! =========================================== Nihao Codeforces! After the unfortunate event which led to [contest:2081] and [contest:2082] being unrated last week, we’re back and stronger than ever! Tsinghua University’s Student Association of Algorithmic Competitions (THUSAAC) is pleased to invite you to participate in [contest:2089] and [contest:2090] on [contest_time:2090]. This round will be RATED for everyone. You will be given 2 hours and 30 minutes to solve 5 problems for division 1 and 6 problems for division 2, and two of each will have subtasks. **Note the unusual time of the round.** Our team of amazing problem setters include: [user:Iam1789,2025-03-20], [user:Ecrade_,2025-03-20], [user:E.Space,2025-03-20], [user:QuietBeautifulThoughts,2025-03-20], [user:gyh20,2025-03-20], [user:spiritualkhorosho,2025-03-20], [user:dapingguo8,2025-03-20], [user:myee,2025-03-20], [user:abruce,2025-03-20], [user:_lucien,2025-03-20]. Some of ...

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46.
Codeforces Round #653 (Div. 3)
Автор vovuh, история, 6 лет назад, По-русски
Codeforces Round #653 (Div. 3) &lt;almost-copy-pasted-part&gt; Hello! [contest:1374] will start at [contest_time:1374]. You will be offered 6 or 7 problems (or 8) with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have rating 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ACM-ICPC). Thus, during the round, solutions will be judged on preliminary tests, and after the round it will be a 12-hour phase of open hacks. I tried to make strong tests &mdash; just like you will be upset if many solutions fail after the contest is over. You will be given 6 or 7 (or 8) problems and 2 hours to solve them. Note that **the penalty** for the wrong submission in this round (and the following Div. 3 rounds) is **10 minutes**. [Remember] (/blog/entry/59228) that only the <i>trusted participants of the third division</i> will be included in the ...
for combating unsporting behavior. To qualify as a trusted participants of the third division

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47.
Codeforces Round #690 (Div. 3)
Автор Supermagzzz, история, 6 лет назад, По-русски
Codeforces Round #690 (Div. 3) Hello, Codeforces! \<almost-copy-pasted-part\> Hello! [Codeforces Round #690 (Div. 3)](https://codeforces.me/contest/1462) will start at [contest_time:1462]. You will be offered 6 problems (one of them is split into two subtasks) with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have a rating 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ACM-ICPC). Thus, during the round, solutions will be judged on preliminary tests, and after the round it will be a 12-hour phase of open hacks. I tried to make strong tests — just like you will be upset if many solutions fail after the contest is over. You will be given 6 problems and 2 hours to solve them. Note that **the penalty** for the wrong submission in this round (and the following Div. 3 rounds) is **10 minutes**. [Remember](https://codeforces.me/bl...
compulsory measure for combating unsporting behavior. To qualify as trusted participants of the third

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48.
We Won Gold — Help Us Reach ICPC World Finals!
Автор Sersawy, история, 10 месяцев назад, По-английски
We Won Gold — Help Us Reach ICPC World Finals! Update #2: ACPC 2025 and ICPC Qualified --------------------------------------- Yesterday, we competed in the Arab & African Collegiate Programming Contest (ACPC) 2025, which we were able to attend thanks to the fundraising campaign and everyone who supported it. We are proud to announce that our team achieved the following results: - Ranked 10th overall across Africa and the Arab region - Won a Bronze Medal - Qualified for the ICPC World Finals 2026 <details> <img src="https://i.ibb.co/twxdzTGg/IMG-20251215-WA0274.jpg" width="400"> </details> We sincerely thank everyone who contributed, shared, or supported our campaign. Your support directly made this achievement possible. Update #1: We Did It! ------------------- We’ve successfully collected all the needed funds. We truly appreciate everyone who supported us and shared our campaign — your help made this achievement possible! <details> <img src="https://i.ibb.co/tppR7hgm/screenshot-2025-11-07-2...
- Qualified for the ICPC World Finals 2026, Update #2: ACPC 2025 and ICPC Qualified ---------------------------------------, With this result, we qualified to represent **Menoufia University** and **Egypt** at the **ACPC

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49.
Codeforces Round 1065 (Div. 3)
Автор reirugan, 10 месяцев назад, По-английски
Codeforces Round 1065 (Div. 3) <img src="https://c.tenor.com/G25fbL0QjmYAAAAd/tenor.gif" style="width: 400.0px;float: right;margin: 0 1.0em 1.0em 1.0em;max-width: 100.0%;max-height: 100.0%;"> Hello, Codeforces! ================== I am very excited to invite you to my second-ever contest, [contest:2171], which will start on [contest_time:2171]! In this contest, you will be given **2 hours and 30 minutes** to solve **7 problems, two of which have been split into subtasks**. The subtasks for a given problem are not necessarily placed adjacently in the problemset. The round will be hosted by the rules of educational rounds (extended ICPC). Thus, all solutions will be judged on preliminary tests during the round, and after the round, there will be a 12-hour phase of **open hacks**. After the open hack phase, all accepted solutions will be rejudged on successful hacks. Also, note that there is no score distribution &mdash; rank will be determined by number of problems solved, followed by penalty; wrong submissions...
unsporting behavior. To qualify as a trusted participant of the third division, you must:

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50.
Codeforces Round 993 (Div. 4)
Автор cry, 21 месяц назад, По-английски
Codeforces Round 993 (Div. 4) Hello Cowodeforces :D ================== <div style="float:right; margin:0 1em 1em 1em; text-align:center;"> <img src="/predownloaded/34/de/34deed19c868273061c83a20c511df592f692e6a.png" style="width:350px;"/> <div> Art by [user:chromate00,2024-12-07] </div> </div> [user:vgoofficial,2024-12-07], [user:Lilypad,2024-12-07] and I are very <img src="/predownloaded/04/7e/047e0b1bcd70ccaa3d6e77f5960774998a58f05a.png" style="width:50px;"/> to invite you to participate in [contest:2044], which will start on [contest_time:2044]. There will be $8$ problems, with one split into two subtasks, to be solved in $2$ hours and $15$ minutes. Participate or you'll have to wait another millennium for a Div. 4 round. The format of the event will be identical to Div. 3 rounds: - ICPC rules with a penalty of 10 minutes for an incorrect submission; - 12-hour phase of open hacks after the end of the round (hacks do not give additional points) - after the end of the open ...
. This is a forced measure for combating unsporting behavior. To qualify as _a trusted participant

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51.
Northern Eurasia Finals 2022 has concluded
Автор orz, история, 4 года назад, По-английски
Northern Eurasia Finals 2022 has concluded Two days ago Northern Eurasia Finals 2022 [took place](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Northern+Eurasia+Finals+2022&iso=20221207T1015&p1=352&ah=5), mirror of which was on Codeforces: [contest:1773]. In the next few hours the [standings](http://nerc.itmo.ru/archive/2022/standings.html) got unfrozen, thereby we know the list of the teams that qualified to the ICPC Finals this year: **1<sup>st</sup> place &#127942;** [MIPT](https://codeforces.me/ratings/organization/38): Yolki-palki ([user:Pechalka,2022-12-09], [user:Kapt,2022-12-09], [user:Tikhon228,2022-12-09]) **2<sup>nd</sup> place &#129351;** [HSE](https://codeforces.me/ratings/organization/250): FFTilted ([user:Kirill22,2022-12-09], [user:teraqqq,2022-12-09], [user:Ormlis,2022-12-09]) **3<sup>rd</sup> place &#129351;** [SPb SU](https://codeforces.me/ratings/organization/16): Urgant Team ([user:sava-cska,2022-12-09], [user:74TrAkToR,2022-12-09], [user:orz,2022-12-09]) **4<sup>th</sup> place &#...
the end of the world will come, hence everyone who qualified instead of me actually postponed, /standings.html) got unfrozen, thereby we know the list of the teams that qualified to the ICPC Finals, The curse is the fact that every year I wasn't able to qualify. Due to presence of some stronger

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52.
Codeforces Round 971 (Div. 4)
Автор cry, 2 года назад, По-английски
Codeforces Round 971 (Div. 4) <center> Heyo Codefoworcers! <br> <img src="/predownloaded/0c/66/0c6613d1b51f55779968580a53ee49f7e326e4fb.png" style="width: 55vw; min-width: 10px;"> ================== </center> [user:vgoofficial,2024-08-27] and I are very delighted to invite you to participate in [contest:2009], which will start on [contest_time:2009]. There will be $7$ problems, with one split into three subtasks, to be solved in $2$ hours and $30$ minutes. We encourage you to participate and hope you have fun, regardless of your division! The format of the event will be identical to Div. 3 rounds: - 5-8 tasks; - ICPC rules with a penalty of 10 minutes for an incorrect submission; - 12-hour phase of open hacks after the end of the round (hacks do not give additional points) - after the end of the open hacking phase, all solutions will be tested on the updated set of tests, and the ratings recalculated - by default, only "trusted" participants are shown in the results table (but the rating will be reca...
. This is a forced measure for combating unsporting behavior. To qualify as _a trusted participant

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53.
Codeforces Round 1071 (Div. 3)
Автор spycoderyt, 8 месяцев назад, По-английски
Codeforces Round 1071 (Div. 3) Hello, Codeforces! ================== [user:iceborworntat,2025-12-19], [user:nortglg,2025-12-19], [user:omsincoconut,2025-12-19], and I are excited to invite everyone to [contest:2179], which will take place on [contest_time:2179]. You will be offered **8 problems**, and you will be given **2 hours and 30 minutes** to solve them. Please note that this contest contains **at least one interactive problem** and **at least one run-twice problem**. Please read the guides for [interactive problems](https://codeforces.me/blog/entry/45307) and [run-twice problems](https://codeforces.me/blog/entry/147996) before the contest if you are unfamiliar with them. The round will be hosted by the rules of educational rounds (extended ICPC). Thus, all solutions will be judged on preliminary tests during the round, and after the round, there will be a 12-hour phase of **open hacks**. After the open hack phase, all accepted solutions will be rejudged on successful hacks. Also, note that there i...
unsporting behavior. To qualify as a trusted participant of the third division, you must:

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54.
Codeforces Round 920 (Div. 3)
Автор pashka, история, 3 года назад, По-русски
Codeforces Round 920 (Div. 3) Hello! On [contest_time:1921] will start [contest:1921], the next Codeforces round for the third division. The round was coordinated by [user:Vladosiya,2024-01-14], and prepared by me and the students of [Neapolis University Pafos](https://lp.jetbrains.com/academy/csai-program/): [user:Vitaly503,2024-01-14], [user:goncharovmike,2024-01-14], [user:ikrpprppp,2024-01-14], [user:step_by_step,2024-01-14]. Thank you very much [user:Alexdat2000,2024-01-14], [user:dan_dolmatov,2024-01-15], [user:fastmath,2024-01-14], [user:FBI,2024-01-14], [user:Nickir,2024-01-14], [user:nikhil97agra,2024-01-14], [user:pavlekn,2024-01-14], [user:PMiguelez,2024-01-14], [user:SashaT9,2024-01-14], [user :senjougaharin,2024-01-14], [user:Sergey140146659,2024-01-14], [user:Sparrow_Guo,2024-01-14], [user:Toy_mouse,2024-01-14], [user:vladmart,2024-01-15] for testing the round. As usual for the third division rounds: - there will be 6-8 tasks in a round - round duration is 2 hours 15 minutes - the round ...
compulsory measure for combating unsporting behaviour. To qualify as a trusted participant of the third

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55.
ICPC Dhaka: Call for Fun Facts
Автор SecondThread, история, 4 года назад, По-английски
ICPC Dhaka: Call for Fun Facts Fun Facts About World Finals Teams ================== Are you participating in ICPC World Finals in Dhaka this week? Is someone from your team competing in World Finals? Did your best friend's brother meet someone whose cousin competed in regionals against a team who qualified? If so, we'd love to get some fun facts about the world finals team from you! If you have any, please submit your fun facts [in this google form](https://forms.gle/VXfD95C4yDsoR2FPA), or send them in a private message to me, [user:SecondThread,2022-11-05], on Codeforces! ![ ](/predownloaded/b7/df/b7df472ba2dcd60580fb0b29299af6435e7fae31.jpg) #### What kind of facts are you looking for? Well variety is what makes things exciting, so we don't want to limit it too much. But for some inspiration, some good ones we've seen in the past include: - I play Smash Melee competitively in my free time - One of our team members (his_handle) is getting married within a week of finals - I'm surprisingly n...
against a team who qualified? If so, we'd love to get some fun facts about the world finals team from, brother meet someone whose cousin competed in regionals against a team who qualified? If so, we'd love, language X. - This weird thing happened at regionals when we qualified. - Our team practiced pretending

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56.
ICPC World Finals in Luxor & Upcoming Interview with Shayan
Автор orz, история, 2 года назад, По-английски
ICPC World Finals in Luxor & Upcoming Interview with Shayan Good evening everyone! TL;DR: I am in Luxor preparing for ICPC WF and making some photos, and also I was offered to (and I will) give an interview to [user:Shayan,2024-04-16], please send your questions. [cut]<div></div> [As you may know](https://codeforces.me/blog/entry/109940), in December 2022 I qualified for ICPC WF 2023 from St Petersburg State University, which (together with ICPC WF 2022) [takes place](https://docs.icpc.global/wf-schedule/) April 14-19, 2024 in Luxor. I've been in Luxor for three days now. Our team still experiences a little jet lag, which means that I sleep not only at night, but also for about three hours during the day. I hope it goes away soon. The community of programmers I interacted with five years ago is now scattered all over the world, but big onsite events like ICPC can bring us all together for a short while. So today I had the pleasure of meeting a bunch of wonderful people, but unfortunately I forgot to take photos with almost all o...
[As you may know](https://codeforces.me/blog/entry/109940), in December 2022 I qualified for ICPC

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57.
Codeforces Round #661 (Div. 3)
Автор vovuh, история, 6 лет назад, По-русски
Codeforces Round #661 (Div. 3) Hello! [contest:1399] will start at [contest_time:1399]. You will be offered 6 or 7 problems (or 8) with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have rating 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ACM-ICPC). Thus, during the round, solutions will be judged on preliminary tests, and after the round it will be a 12-hour phase of open hacks. I tried to make strong tests &mdash; just like you will be upset if many solutions fail after the contest is over. You will be given 6 or 7 (or 8) problems and 2 hours to solve them. Note that **the penalty** for the wrong submission in this round (and the following Div. 3 rounds) is **10 minutes**. [Remember] (/blog/entry/59228) that only the <i>trusted participants of the third division</i> will be included in the official standings table. As it is ...
for combating unsporting behavior. To qualify as a trusted participants of the third division

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58.
[SCOREBOARD UNFROZEN] MIT Informatics Tournament 2026 Spring Invitational
Автор zhoukangyang, 6 месяцев назад, По-английски
[SCOREBOARD UNFROZEN] MIT Informatics Tournament 2026 Spring Invitational **UPD 04/05/2026:** The Qualifier 2 has finished. The [scoreboard](https://mitit.org/Contest/ViewScoreboard/qualification-2026-2) is unfrozen. See the [gym](https://codeforces.me/gym/106463) which also has the editorial. We are not finished of our manual reviewing of the submissions. The scoreboard is not finalized yet. ------------------ Hello Codeforces! We ([user:ETK.,2026-03-03], [user:flamestorm,2026-03-03], [user:AdhityaMangudy,2026-03-03], [user:L567,2026-03-03], [user:zhoukangyang,2026-03-03], [user:SHZhang,2026-03-03], [user:JohnVictor,2026-03-03], [user:duality,2026-03-03], [user:innocentkitten,2026-03-03], [user:79brue,2026-03-03], [user:codetiger927,2026-03-03], [user:bensonlzl,2026-03-03], [user:kingofpineapples,2026-03-03], [user:czhang2718,2026-03-03], [user:eyangch,2026-03-03], [user:xgaz_,2026-03-03], [user:Feet_McYeet,2026-03-03], [user:rayfish,2026-03-03], [user:Peppa_king_8,2026-03-03], [user:Wang238328,2026-03-03], [user:hyforces,2026-03-03], [user:lunch...
Round. The top 50% of competitors (capped at 400) from Qualification Round 1 willqualify for, The top 16 US, top 8 international, and top 4 US high school contestants will qualify for the

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59.
Codeforces Round 1003 (Div. 4)
Автор cry, 19 месяцев назад, По-английски
Codeforces Round 1003 (Div. 4) <center> <img src="/predownloaded/99/4b/994b58685f9f2ec77697288af6b2e8e364f29fad.png" style="width:75px;"/> Codeforces! </center> ================== [user:Proof_By_QED,2025-02-05], [user:chromate00,2025-02-05], [user:larush,2025-02-05], [user:Edeeva,2025-02-05], and I would like to invite you to participate in [contest:2065], starting on [contest_time:2065]. We have baked $8$ problems to be solved in $2$ hours and $15$ minutes. We hope the problems will be interesting, unique...and skibidi. The format of the event will be identical to Div. 3 rounds: - ICPC rules with a penalty of 10 minutes for an incorrect submission; - 12-hour phase of open hacks after the end of the round (hacks do not give additional points) - after the end of the open hacking phase, all solutions will be tested on the updated set of tests, and the ratings recalculated - by default, only "trusted" participants are shown in the results table (but the rating will be recalculated for all with initial rat...
. This is a forced measure for combating unsporting behavior. To qualify as _a trusted participant

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60.
My Review about Scaler academy. To all my Indian juniours and experienced professionals, Never join Scaler Academy(Interviewbit).
Автор Interviewbit_is_fraud, история, 6 лет назад, По-английски
My Review about Scaler academy. To all my Indian juniours and experienced professionals, Never join Scaler Academy(Interviewbit). Hello, I was enrolled in Interviewbit(Scaler academy) course in May, 2019. I belongs to tier 3 college. Only companies with max 5-6 lack per annum comes to my college. In a hope of getting into good companies I decided to join Interviewbit. I qualified their entrance test which is hard in itself for many average coders in India. Then in a hope of securing good referrals, I used to maintain my Problem solving Percentage above 80% most of time. When the time of referral come in september &mdash; october 2019, they were saying that, right now companies are hiring for on campus and thus we will refer you around November. I believed them. Continued to solve problems working day and night, burning the midnight oil, just in a hope that if I get a referral of good companies. Now, when when it is november 2019, they came up with new excuse. They told that we are in talk with top tech companies, you will soon hear good news from us. Then many days passed. Nothing happened. I was still hopi...
companies I decided to join Interviewbit. I qualified their entrance test which is hard in itself

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61.
Google Code Jam 2021 Finalists
Автор Ra16bit, история, 5 лет назад, По-английски
Google Code Jam 2021 Finalists Today is the day of Google Code Jam 2021 Virtual World Finals. Haven't seen a blog with the list of finalists yet, so I decided to create one. Here they are (in the order they've qualified from Round 3): | GCJ Handle | CF Handle | Country | CF Rating | Finals before| Best place before | |---------------|--------------|---------|-----------|-------------|--------------------------| | Gennady.Korotkevich | [user:tourist,2021-08-07] | Belarus | 3819 | 7 | Seven times GCJ World Champion (2014-2020) | | xll114514 | [user:Retired_MiFaFaOvO,2021-08-07] | China | 3681 | 1 | 6th @ GCJ 2017 | | Um_nik | [user:Um_nik,2021-08-07] | Russia | 3489 | 0 | | | maroon | [user:maroonrk,2021-08-07] | Japan | 3400 | 0 | | | semiexp. | [user:semiexp,2021-08-07] | Japan | 3115 | 5 | 10th @ GCJ 2016 | | scottwu | [user:scott_wu,2021-08-07] | United States | 3169 | 2 | 4t...
finalists yet, so I decided to create one. Here they are (in the order they've qualified from Round

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62.
Codeforces Round #686 (Div. 3)
Автор vovuh, история, 6 лет назад, По-русски
Codeforces Round #686 (Div. 3) Hello! [contest:1454] will start at [contest_time:1454]. You will be offered 6 or 7 problems (or 8) with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have rating 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ACM-ICPC). Thus, during the round, solutions will be judged on preliminary tests, and after the round it will be a 12-hour phase of open hacks. I tried to make strong tests &mdash; just like you will be upset if many solutions fail after the contest is over. You will be given 6 or 7 (or 8) problems and 2 hours to solve them. Note that **the penalty** for the wrong submission in this round (and the following Div. 3 rounds) is **10 minutes**. [Remember] (/blog/entry/59228) that only the <i>trusted participants of the third division</i> will be included in the official standings table. As it is ...
for combating unsporting behavior. To qualify as a trusted participants of the third division

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63.
Codeforces Round #479 (Div. 3)
Автор vovuh, 8 лет назад, перевод, По-русски
Codeforces Round #479 (Div. 3) Hello! [contest:977] will start on [May 6 (Sunday) at 14:05 (UTC)] (http://www.timeanddate.com/worldclock/fixedtime.html?day=6&month=5&year=2018&hour=17&min=5&sec=0&p1=166). It will be the first Div.3 round in the history of Codeforces. You will be offered 6 problems with expected difficulties to compose an interesting competition for participants with ratings up to 1600. Probably, participants from the first division will not be at all interested by this problems. And for 1600-1899 the problems will be too easy. However, all of you who wish to take part and have rating 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ACM-ICPC). Thus, during the round, solutions will be judged on preliminary tests, and after the round it will be a 12-hour phase of open hacks. I tried to make strong tests &mdash; just like you will be upset if many solutions fail after the contest is over. [Remember] (/blog/entry/59228) t...
for combating unsporting behavior. To qualify as a trusted participants of the third division

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64.
Codeforces Round #925 (Div. 3)
Автор Vladosiya, история, 3 года назад, По-русски
Codeforces Round #925 (Div. 3) Hello! [contest:1931] will start at [contest_time:1931]. You will be offered 6-8 problems with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have a rating of 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ICPC). Thus, solutions will be judged on preliminary tests during the round, and after the round, it will be a 12-hour phase of **open hacks**. You will be given **7 problems** and **2 hours and 15 minutes** to solve them. Note that the **penalty** for the wrong submission in this round is **10 minutes**. [Remember](https://codeforces.me/blog/entry/59228) that only the trusted participants of the third division will be included in the official standings table. As it is written by link, this is a compulsory measure for combating unsporting behavior. To qualify as a _trusted participant of the third...
compulsory measure for combating unsporting behavior. To qualify as a _trusted participant of the third

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65.
Codeforces Round 1017 (Div. 4)
Автор Proof_by_QED, 17 месяцев назад, По-английски
Codeforces Round 1017 (Div. 4) # Good Morning/Afternoon/Evening/Night Codeforces ---------- <center> <br/> <img src="https://i.ibb.co/dZM4Rgm/1000015885-removebg-preview.png" alt="1000015885-removebg-preview" border="0"><br/> This is Orangutini Ananasini Emoji </center> ---------- [user:cry,2025-04-07] and I are overjoyed to welcome you to participate in [contest:2094] at [contest_time:2094]. **Note the unusual time of the round**. You will be given $2$ hours and $15$ minutes to solve $8$ problems. The round will be hosted by rules of educational rounds (extended ICPC). Thus, solutions will be judged on preliminary tests during the round, and after the round, it will be a 12-hour phase of **open hacks**. After open hacks all accepted solutions will be rejudged on successful hacks. Note that the **penalty** for each wrong submission in this round is **10 minutes**. Also, **note the [rule restricting AI use](https://codeforces.me/blog/entry/133941)!!!** If you are caught using AI, your submissio...
compulsory measure for combating unsporting behavior. To qualify as a _trusted participant of the

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66.
How I reached GM using Generative Functions
Автор waipoli, история, 18 месяцев назад, По-английски
How I reached GM using Generative Functions Hello, Codeforces! In this blog, having thought of nothing better, I want to tell you a story. A story about how little Chmyaaax, even before school, was forbidden to play computer games. About how, driven by a great desire to play tanks, he started making them in Scratch. About how he moved on from Scratch to Robot, and then to Turtle. From Turtle to Pascal. About how, at the age of 10, he was introduced to competitive programming. About how, after two failed Div3 contests, he quit for two years. About how, during that time, he passionately learned C++ so he could continue making computer games (which he still wasn’t allowed to play). About how he later returned, motivated by money (the story about NEAR, where you had to reach 1600 to earn cash) (to then buy a second phone and play Brawl Stars). About how, after failing, he abandoned it again and went into commercial programming (making games). And then he came back to the sacred world, failing every TST the year before l...
After failing to qualify for EJOI and seeing his childhood friends surpass him, he gained something, As if by magic, he qualified for every possible Olympiad in the 2023-2024 season. He realized that

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67.
The 7th Turing Cup Tournament
Автор dXqwq, 15 месяцев назад, По-английски
The 7th Turing Cup Tournament # 2025 · The 7th Turing Cup Tournament The Turing Cup is an invitational competition that is organized by one of the most successful informatics competition teams in China, the XinYouDui and partner with X-Camp Academy. ## Timeline | Event | Time (UTC+8) | |----------------------|-----------------------------------------| | Registration Time | May 06, 2025, 06:00 PM &mdash; May 25, 2025, 12:29 PM | | Opening Ceremony | May 25, 2025, 07:50 AM &mdash; 08:30 AM | | Contest Time | May 25, 2025, 08:30 AM &mdash; 12:30 PM | --- ## Contest Details ### Staff - Writers: [user:dXqwq,2025-05-22], [user:Flamire,2025-05-22], [user:myee,2025-05-22], [user:orzdevinwang,2025-05-22], [user:zhaohaikun,2025-05-22] - Testers: [user:dspt,2025-05-22], [user:emptyhope,2025-05-22], [user:jqdai0815,2025-05-22], [user:Kubic,2025-05-22], [user:le0n,2025-05-22], [user:zhaohiakun,2025-05-22] ### Features - **High Contest Q...

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68.
Educational Codeforces Round 38 [Rated for Div. 2]
Автор awoo, история, 9 лет назад, По-русски
Educational Codeforces Round 38 [Rated for Div. 2] Hello Codeforces! On [February 16, 18:05 MSK](http://www.timeanddate.com/worldclock/fixedtime.html?day=16&month=2&year=2018&hour=18&min=5&sec=0&p1=166) Educational Codeforces Round 38 will start. Series of Educational Rounds continue being held as [Harbour.Space University](https://harbour.space/) initiative! You can read the details about the cooperation between [Harbour.Space University](https://harbour.space/) and Codeforces in the [blog post](http://codeforces.me/blog/entry/51208). This round will be **rated for Div. 2**. It will be held on extented ACM ICPC rules. After the end of the contest you will have **12 hours** to hack any solution you want. You will have access to copy any solution and test it locally. You will be given **7 problems** and **2 hours** to solve them. The problems were prepared by Ivan [user:BledDest,2018-02-15] Androsov, Sahand [user:Sahaand,2018-02-15] Alitanloo and me. Thanks Mike [user:MikeMirzayanov,2017-12-27] Mirzayanov for great sy...
/?utm_source=Codeforces): MIPT and all top India’s Universities that qualified to the World Finals!

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69.
The 2024 ICPC World Finals Astana
Автор ICPCNews, 2 года назад, По-английски
The 2024 ICPC World Finals Astana <img alt="ICPC WF Astana logo" src="/predownloaded/39/23/39236863840dfd457e23a532a815fe1b722a0a69.jpg" style="margin: 1em; height: 300.0px;max-width: 100.0%;max-height: 100.0%;" align="right"> Салем Codeforces! We are glad to invite you to follow 2024 ICPC World Finals in Astana, Kazakhstan! This is the third ICPC World Finals to be held this year. It is the culmination of the 2023-2024 ICPC season, and we have over 140 teams competing for the title of ICPC champion. Advancing from the regional contest, 141 of the world’s strongest students teams of programmers will compete at the 48th ICPC World Championship in Astana! 2024 ICPC World Finals Astana will begin on [September 19, 2024 at 11:00 (UTC+5)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=The+2024+ICPC+World+Finals+Astana&iso=20240919T11&p1=921). We are thrilled to invite you to join the live broadcast of the main event of the year in the world of sports programming! Teams qualified to ICPC WF Astana...
Teams qualified to ICPC WF Astana:

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70.
ACPC 2024 qualified teams list
Автор Octagons, история, 22 месяца назад, По-английски
ACPC 2024 qualified teams list This blog is inspired by [user:MinaRagy06,2024-10-20]'s [Comment](https://codeforces.me/blog/entry/135260#comment-1209307) on [user:Farsh_LE,2024-10-20]'s [blog](https://codeforces.me/blog/entry/135260). If your team is not listed or if there’s an error in the team details, please leave a comment on the blog, and I’ll update the blog. ACPC is supposed to be in december so good luck to all participating teams! <h2>University Teams</h2> <table class = "bordertable"><thead> <tr> <th>Country</th> <th>University</th> <th>Team Name</th> <th>Member 1</th> <th>Member 2</th> <th>Member 3</th><th>Team Rating</th> </tr> </thead><tbody><tr> <td>Egypt</td> <td>FCAI Cairo University</td> <td>El Tor 3ada wna 3al M5da</td> <td>[user:Gamal74,2024-12-01] </td> <td>[user:Drakkon,2024-12-01] </td> <td>[user:RaiseFromDeath,2024-12-01] </td> <td>2422.231</td> </tr> <tr> <td>Tunisia</td> <td>École Polytechnique de Tunisie</td> <td>for the win</td> <td>[user:Kurlex,2024-12-...
ACPC 2024 qualified teams list

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71.
Teams going to ICPC WF 2022 (Egypt 2023) — WIP List
Автор FedeNQ, история, 3 года назад, По-английски
Teams going to ICPC WF 2022 (Egypt 2023) — WIP List Hi there! While we're waiting for the formal invitations to the ICPC World Final 2023, let's start the new post for the incoming competition, keeping the same idea of the [previous blog](https://codeforces.me/blog/entry/102593) As many of you already know, next WF will be something like a two-in-one competition, without knowing the actual format yet. I think it would be good to make two differents post, one per WF, because otherwise it would probably be a _very long_ post. Anyway, let the people decide :) _(I don't know if this poll works)_ Two posts: The same post: At least for now, we'll fill this post with teams of **THE FIRST WF** in Egypt, assuming that those are the qualified from Regionals **2021/2022**. (Trying to be more specific: the teams that qualified in the Regional held after the one that qualified to Dhaka) Please add a comment with your team information and I will add it to the post. Info preferre...
are the qualified from Regionals **2021/2022**. (Trying to be more specific: the teams that

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72.
Hacker Cup Shirts 2023
Автор SecondThread, история, 3 года назад, По-английски
Hacker Cup Shirts 2023 Meta Hacker Cup Shirts ================== Hacker Cup prizes are back this year, and the shirts are back in black! The **top 2000 participants** in [Round 2](https://www.facebook.com/codingcompetitions/hacker-cup/2023/round-2) will win a shirt. If you qualify for [Round 3](https://www.facebook.com/codingcompetitions/hacker-cup/2023/round-3) and finish in the top 200, you'll win a shirt with a top-200 badge on the sleeve instead of the normal shirt. Just like last year, T-Shirts will be able to be claimed in your [Hacker Cup Profile](https://www.facebook.com/codingcompetitions/profile) after we have finished plagiarism checks for the Round 3. <strike>(or after we have finished plagiarism checks for Round 2 if you didn't qualify for Round 3 and have no chance of winning a top-200 shirt)</strike> ![ ](https://wumbogames.github.io/cfPictures/hc2023profileprize.png) ![ ](https://wumbogames.github.io/cfPictures/hc2023shirt.png) You must claim your shirt by **December 15th*...
shirt. If you qualify for [Round 3](https://www.facebook.com/codingcompetitions/hacker-cup/2023/round-3, . (or after we have finished plagiarism checks for Round 2 if you didn't qualify for Round 3 and

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73.
Codeforces Round #642 (Div. 3)
Автор vovuh, история, 6 лет назад, перевод, По-русски
Codeforces Round #642 (Div. 3) &lt;almost-copy-pasted-part&gt; Hello! [contest:1353] will start at [contest_time:1353]. You will be offered 6 or 7 problems (or 8) with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have rating 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ACM-ICPC). Thus, during the round, solutions will be judged on preliminary tests, and after the round it will be a 12-hour phase of open hacks. I tried to make strong tests &mdash; just like you will be upset if many solutions fail after the contest is over. You will be given 6 or 7 (or 8) problems and 2 hours to solve them. Note that **the penalty** for the wrong submission in this round (and the following Div. 3 rounds) is **10 minutes**. [Remember] (/blog/entry/59228) that only the <i>trusted participants of the third division</i> will be included in the ...
for combating unsporting behavior. To qualify as a trusted participants of the third division

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74.
Codeforces Round #760 (Div. 3)
Автор BledDest, 5 лет назад, По-русски
Codeforces Round #760 (Div. 3) Hello, Codeforces! On [contest_time:1618] the [contest:1618] will start. This is a usual round for the participants from the third division. The round will contain 8 problems, which are mostly suited for participants with rating below 1600 (or we hope so). Although, as usual, participants with rating of 1600 and greater can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ACM-ICPC). Thus, during the round, solutions will be judged on preliminary tests, and after the round it will be a 12-hour phase of open hacks (we hope that our tests are strong enough, so there won't be too many solutions hacked during this phase). You will have to solve **8 problems** in **2 hours and 15 minutes**. The penalty for a wrong submission is equal to **10 minutes**. [We remind you](https://codeforces.me/blog/entry/59228) that only _the trusted participants of the third division_ will be included in the official standings table. As it is w...
qualify as _a trusted participant of the third division_, you must:

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75.
Useful functions that nobody uses
Автор Qualified, 6 лет назад, По-английски
Useful functions that nobody uses With [user:pllk,2021-01-15] introducing 100 more problems to the [CSES problemset](https://cses.fi/problemset/), the race for shortest code is on. Here in this blog, I talk about the many different ways of shortening code to get that shortest code. <h2>std::any_of</h2> This is a very useful function that returns true iff any of the elements in the range `[first, last)` satisfies some condition. Let's say you want to figure out if an array contains at least one 9. You could just write the naive loop and waste time in contest. ~~~~~ bool ok = 0; for(int i = 0; i < (int)(a).size(); ++i) { if(a[i] == 9) { ok = 1; break; } } ~~~~~ but you could be smart and write this all in one line. ~~~~~ bool ok = any_of(a.begin(), a.end(), [](int x) { return x == 9; }); ~~~~~ <h5>Time Complexity</h5> This is linear aka $O(n)$. <h2>std::all_of</h2> This is another useful function that functions similar to `std::any_of`. The difference is that it returns true iff all...
Qualified

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76.
Strange Situation about IOI eligibility
Автор tmwilliamlin168, история, 9 лет назад, По-английски
Strange Situation about IOI eligibility Hello, I have dual citizenship (Taiwan and USA), and I currently study in an American high school located in Taiwan. I've already participated in the regional contest about 7 weeks ago and did pretty well, so I qualified for the national contest. So now I'm practicing as much as I can for the national contest, but recently I was told that I could qualify for the training camp but not the national team for Taiwan. I searched online for IOI rules and found this link on the IOI-2017 site: http://www.ioinformatics.org/rules/reg17.pdf. Here are some parts of it that stood out: "A Contestant is a student who was enrolled in a school at a level not higher than secondary education, in the Country they are representing, for the majority of the period 1 September to 31 December in the year before IOI’n. Students who are studying abroad may represent the Country of their nationality." Not only am I studying in Taiwan, I also have Taiwan citizenship, so I definitely fit this criteri...
could qualify for the training camp but not the national team for Taiwan., , so I qualified for the national contest.

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77.
Codeforces Round #881 (Div. 3)
Автор EJIC_B_KEDAX, история, 3 года назад, По-русски
Codeforces Round #881 (Div. 3) Hello, Codeforces! On [contest_time:1843] [contest:1843] will start. You will be offered 7 problems with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have a rating of 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ICPC). Thus, solutions will be judged on preliminary tests during the round, and after the round, it will be a 12-hour phase of **open hacks**. You will be given **7 problems** and **2 hours and 15 minutes** to solve them. Note that the **penalty** for the wrong submission in this round is **10 minutes**. [Remember](https://codeforces.me/blog/entry/59228) that only the *trusted participants of the third division* will be included in the official standings table. As it is written by link, this is a compulsory measure for combating unsporting behavior. To qualify as a *trusted partic...
compulsory measure for combating unsporting behavior. To qualify as a *trusted participant of the

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78.
Codeforces Round #693 (Div. 3)
Автор Stepavly, история, 6 лет назад, По-русски
Codeforces Round #693 (Div. 3) Happy New Year, Codeforces! UPD: _**We have received such different opinions about the order of problems, that we cannot be completely sure about it. We recommend you to read all the problems and do not strongly hope that the difficulty for you necessarily coincides with the order in the round.**_ \<almost-copy-pasted-part\> Hello! [Codeforces Round #693 (Div. 3)](https://codeforces.me/contest/1472) will start at [contest_time:1472]. You will be offered 7 problems with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have a rating 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ICPC). Thus, during the round, solutions will be judged on preliminary tests, and after the round it will be a 12-hour phase of open hacks. We tried to make strong tests — just like you will be upset if many solutions fail after t...
compulsory measure for combating unsporting behavior. To qualify as trusted participants of the third

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79.
Discussion on the latest update of WF2020
Автор chenjb, история, 5 лет назад, По-английски
Discussion on the latest update of WF2020 The ICPC headquarter sents an e-mail to update the status of WF2020: <spoiler summary="Content"> Response needed by Friday, July 16, 2021. Dear 2020 World Finals Coach, Your 2020 ICPC World Finals team has qualified to compete in the ICPC World Finals Moscow hosted by MIPT, scheduled for October 5, 2021! Team arrival is on October 1, 2021, with a departure on October 6, 2021. MIPT is working toward providing rapid, online visa processing that supersedes published travel restrictions in Russia for all participants holding valid passports. More details will be sent by email soon. To assure full team participation on the scheduled date, we have made changes to the conduct of the World Finals that permit hybrid teams. Each contestant has the option to compete either on-site in Moscow or remotely. Your three contestants do not have to select the same options. We are working with MIPT to ensure that the events, hotels, and local transportation follow all public healt...
Your 2020 ICPC World Finals team has qualified to compete in the ICPC World Finals Moscow hosted by

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80.
Codeforces Round #667 (Div. 3)
Автор vovuh, история, 6 лет назад, По-русски
Codeforces Round #667 (Div. 3) Hello! [contest:1409] will start at [contest_time:1409]. You will be offered 6 or 7 problems (or 8) with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have rating 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ACM-ICPC). Thus, during the round, solutions will be judged on preliminary tests, and after the round it will be a 12-hour phase of open hacks. I tried to make strong tests &mdash; just like you will be upset if many solutions fail after the contest is over. You will be given 6 or 7 (or 8) problems and 2 hours to solve them. Note that **the penalty** for the wrong submission in this round (and the following Div. 3 rounds) is **10 minutes**. [Remember] (/blog/entry/59228) that only the <i>trusted participants of the third division</i> will be included in the official standings table. As it is ...
for combating unsporting behavior. To qualify as a trusted participants of the third division

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81.
CodeCraft-22 and Codeforces Round #795 (Div 2.)
Автор amul_agrawal, 4 года назад, По-английски
CodeCraft-22 and Codeforces Round #795 (Div 2.) **Namaste Codeforces!** We are excited to invite everyone to **CodeCraft-22** which will take place on [contest_time:1691]. It is rated for all people who are below **<font color="#ff8c00">yellow</font>**! (rating under 2100) The [**Programming Club at IIIT-H**](https://iiit-programming-club.github.io/) organizes this event under Threads'22, as a part of our techno-cultural fest [**Felicity, IIIT Hyderabad**](http://felicity.iiit.ac.in). <img src="/predownloaded/91/7b/917ba5fc64144c1effe15bd932cfb39dab2f7fda.png" width="400px"> There are **6** Problems with **2 hours** to solve them. The scoring distribution will be released soon! We have worked hard to keep the statements clean and the pretests strong! After the contest, **step-wise tutorial** and **video tutorial** will be released along with the code! - This round was wonderfully co-ordinated by [user:darkkcyan,2022-05-27] and [user:KAN,2022-05-27] orz! - This round was a joint effort by [user:rahulgoel,2022-05-...
set to India in their CF profile will qualify as Indian participants.

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82.
Codeforces Round #634 (Div. 3)
Автор vovuh, история, 6 лет назад, перевод, По-русски
Codeforces Round #634 (Div. 3) &lt;almost-copy-pasted-part&gt; Hello! [contest:1335] will start at [contest_time:1335]. You will be offered 6 or 7 problems (or 8) with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have rating 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ACM-ICPC). Thus, during the round, solutions will be judged on preliminary tests, and after the round it will be a 12-hour phase of open hacks. I tried to make strong tests &mdash; just like you will be upset if many solutions fail after the contest is over. You will be given 6 or 7 (or 8) problems and 2 hours to solve them. Note that **the penalty** for the wrong submission in this round (and the following Div. 3 rounds) is **10 minutes**. [Remember] (/blog/entry/59228) that only the <i>trusted participants of the third division</i> will be included in the ...
for combating unsporting behavior. To qualify as a trusted participants of the third division

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83.
Retiring from rated contests
Автор bmerry, история, 8 лет назад, По-английски
Retiring from rated contests I've been thinking of retiring from algorithm contests for a while, having failed to qualify for any on-sites in 2017 or 2018 (I'm excluding DCJ from algorithm contests). This is definitely a young person's game and I can feel I'm not as sharp as I used to be. I still love problem solving, but when I'm under time pressure and just can't see the solution and know my rating is going to crash, I get so stressed and frustrated that I don't enjoy it any more. Now that both my Topcoder and Codeforces ratings are back over 3000 I've decided to retire from rated contests so that I'll go out on a high. I will most likely continue to do unrated contests where if I have a bad day I can just walk away instead of stressing myself out. I might also get more involved in testing contests.
I've been thinking of retiring from algorithm contests for a while, having failed toqualify for

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84.
Codeforces Round #799 (Div. 4)
Автор SlavicG, 4 года назад, По-английски
Codeforces Round #799 (Div. 4) Hello Codeforces! [user:mesanu,2022-06-12], [user:flamestorm,2022-06-12], [user:MikeMirzayanov,2022-06-12] and I want to invite you to [contest:1692]! It starts on [contest_time:1692]. The format of the event will be identical to Div. 3 rounds: - 5-8 tasks; - ICPC rules with a penalty of 10 minutes for an incorrect submission; - 12-hour phase of open hacks after the end of the round (hacks do not give additional points) - after the end of the open hacking phase, all solutions will be tested on the updated set of tests, and the ratings recalculated - by default, only "trusted" participants are shown in the results table (but the rating will be recalculated for all with initial ratings less than 1400 or you are an unrated participant/newcomer). We urge participants whose rating is 1400+ not to register new accounts for the purpose of narcissism but to take part unofficially. Please do not spoil the contest for the official participants. Only _trusted participants of th...
. This is a forced measure for combating unsporting behavior. To qualify as _a trusted participant

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85.
Teams Qualified for Africa and Arab Collegiate Programming Championship — ACPC 2020
Автор MuhammadAl-Halaby, история, 6 лет назад, По-английски
Teams Qualified for Africa and Arab Collegiate Programming Championship — ACPC 2020 Hello everyone! Congratulations to all of the qualified teams for ACPC 2020. Since the championship is finally closing up, it's exciting to take a look and know who your competitors are, and that's why I made a list of the competing teams with the help of many participating contestants. Teams are sorted by rating calculated by [this formula](https://codeforces.me/blog/entry/16986). If you qualified to ACPC 2020 and your team is not on the list, please write your team info in the comments section and I'll keep the list updated. Don't forget to follow this format: <spoiler summary="Team info format"> Country University Team Name Coach Name Handle1 Handle2 Handle3 (separated by spaces) </spoiler> I hope you can all make it to Luxor this year! See you there and good luck! <table><tr><th bgcolor="#d3d3d3">#</td><th bgcolor="#d3d3d3">Country</td><th bgcolor="#d3d3d3">University</td><th bgcolor="#d3d3d3">Team Name</td><th bgcolor="#d3d3d3">Team Members</td><th...
Teams Qualified for Africa and Arab Collegiate Programming Championship — ACPC 2020, Congratulations to all of the qualified teams for ACPC 2020. Since the championship is finally, If you qualified to ACPC 2020 and your team is not on the list, please write your team info in the

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86.
Codeforces Round 1076 (Div. 3)
Автор KluydQ, история, 7 месяцев назад, По-русски
Codeforces Round 1076 (Div. 3) Hello, Codeforces! ------------------ <img src="/predownloaded/b1/86/b1863bb9ac63822d00c2bcf47725b2cb03758307.png" style="float: right; width: 200px; margin-left: 0px;"> We are glad and excited to invite you to take part in [contest:2193], which will take place on [contest_time:2193]. You will be given **2** hours and **15** minutes to solve **7-8** probmles. At least one problem will be interactive, so we highly recommend to read [guide for interactive problems](https://codeforces.me/blog/entry/45307) before the contest. The round will be hosted by the rules of educational rounds (extended ICPC). Thus, all solutions will be judged on preliminary tests during the round, and after the round, there will be a 12-hour phase of open hacks. After the open hack phase, all accepted solutions will be rejudged on successful hacks. [As a reminder](https://codeforces.me/blog/entry/59228), only trusted participants of the third division will be included in the official standings table....
unsporting behavior. To qualify as a trusted participant of the third division, you must:

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87.
9th BSUIR Open Programming Championship
Автор aropan, 7 лет назад, По-русски
9th BSUIR Open Programming Championship <div style="text-align: center; margin-bottom: 10px;"> <img src="http://fksis.bsuir.by/wps/wcm/connect/0b2ce08048f7551a8edcee2567d03bb3/1/photo_2019-02-26_16-25-55.jpg?MOD=AJPERES"/> </div> The results and upsolving of the semifinal are available at [link](https://official.contest.yandex.ru/bsuir2019/contest/12360/standings). Many thanks to all guys who made this contest for you: [user:hloya_ygrt,2019-03-20], [user:teleport,2019-03-20], [user:wilcot,2019-03-20], [user:ShavelV,2019-03-20], [user:rui-de,2019-03-20], [user:Vladik,2019-03-20], [user:vilcheuski,2019-03-20], [user:netman,2019-03-20], [user:tkach1024,2019-03-20] and [user:jklementseva,2019-03-21]. The **9th BSUIR Open Programming Championship** will be held from March 13 till April 25, 2019 (Minsk, Belarus). [cut] Undergraduates and postgraduates of BSUIR, students of other educational institutions, students from other universities and countries are invited to participate in the Championship. The competition wi...

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88.
overwhelmed
Автор Lyde, история, 3 года назад, По-английски
overwhelmed **Note: it's a mile-long wall of text about my story in the recent ICPC Regional Contest, which is my first time experiencing it, so if I wasted anyone's time, I'm truly sorry.** <spoiler summary="Backstory"> I kinda lost motivation in Competitive Programming for a while and decided to take a long hiatus since March. I had a lot of work to study and do, given semesters and stuff, and preparing to go to university (I'm 18). It wasn't fun back then. Fast forward to June, when everything was done, I had a bunch of universities to choose from, and it really messed up my mind. Every school felt, equal. It took like a whole 2 months before I chose Hanoi University of Science and Technology (HUST), most probably because it's well-known in Vietnam and has a long and successful history and stuff. I knew that it was really hard to not choose Vietnam National University (VNU), since it's a really good school and most of the strongest people in programming, especially CP, went there. My s...
it's really good to pursue some hope in life and expect a better future. Maybe we didqualify for, , and I did 0). But again being saved by the teammate and doing enough problems, wequalified to the

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89.
VK Cup 2018 Round 1 and CF Round #470 (div. 1 & 2)
Автор majk, 8 лет назад, перевод, По-русски
VK Cup 2018 Round 1 and CF Round #470 (div. 1 & 2) The round 1 of VK Cup 2018 will take place on March 10 at 18:35 MSK ([check your timezone](https://www.timeanddate.com/worldclock/fixedtime.html?day=10&month=3&year=2018&hour=18&min=35&sec=0&p1=166)). The contest "VK Cup 2018 — Round 1" is for teams qualified from two Qualification Rounds. The top 400 teams will advance to the Round 2, along with teams that qualify in the Wild Card Round 1 a week later. As usual, there will be two parallel rounds for those ineligible to participate in VK Cup, one for each division. I'd like to thank [user:KAN,2018-03-08] for steering my crazy ideas into a coherent unit, the coordination and also for suggesting one of the problems, [user:AlexFetisov,2018-03-08], [user:qwerty787788,2018-03-08], [user:winger,2018-03-08], [user:Errichto,2018-03-09], [user:Tommyr7,2018-03-10] and [user:misof,2018-03-08] for testing the problems, [user:MikeMirzayanov,2018-03-08] for building Codeforces and Polygon and VK for organising the contest. All three rounds ...
)). The contest "VK Cup 2018 — Round 1" is for teams qualified from two Qualification Rounds. The top

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90.
Codeforces Round 895 (Div. 3)
Автор sevlll777, история, 3 года назад, По-русски
Codeforces Round 895 (Div. 3) Hello Codeforces! [contest:1872] will start at [contest_time:1872]. You will be offered 7 problems with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have a rating of 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ICPC). Thus, solutions will be judged on preliminary tests during the round, and after the round, it will be a 12-hour phase of **open hacks**. You will be given **7 problems** and **2 hours and 15 minutes** to solve them. Note that the **penalty** for wrong submission in this round is **10 minutes**. [Remember](https://codeforces.me/blog/entry/59228), that only the _trusted participants of the third division_ will be included in the official standings table. As it is written by link, this is a compulsory measure for combating unsporting behavior. To qualify as a _trusted participant of t...
compulsory measure for combating unsporting behavior. To qualify as a _trusted participant of the

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91.
Codeforces Round 1029 (Div. 3)
Автор yse, 15 месяцев назад, По-английски
Codeforces Round 1029 (Div. 3) أهلاً, Codeforces! ---------------------- [user:cry,2025-06-04], [user:Intellegent,2025-06-04], and I are really excited to invite you to participate in [contest:2117], which will take place on [contest_time:2117]. You will be given $2$ hours and $15$ minutes to solve $8$ problems. The round will be hosted by rules of educational rounds (extended ICPC). Thus, all solutions will be judged on preliminary tests during the round, and after the round, there will be a 12-hour phase of **open hacks**. After the open hack phase, all accepted solutions will be rejudged on successful hacks. Also, note that there is no score distribution but the usual penalty of **10 minutes** for each wrong submission, following the rules of educational rounds. Note that the penalty for each wrong submission in this round is **10 minutes**. Also, **note the rule [restricting AI use](https://codeforces.me/blog/entry/133941)**. If you are caught using AI in an unorthodox manner, you will be sent to [use...
compulsory measure for combating unsporting behavior. To qualify as a _trusted participant of the third

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92.
Codeforces Round #849 (Div. 4)
Автор mesanu, история, 4 года назад, По-английски
Codeforces Round #849 (Div. 4) Hello Codeforces! [user:flamestorm,2022-08-28], [user:SlavicG,2023-02-01], [user:MikeMirzayanov,2022-07-11] and I want to invite you to [contest: 1791]. It starts on [contest_time: 1791]. The format of the event will be identical to Div. 3 rounds: - 5-8 tasks; - ICPC rules with a penalty of 10 minutes for an incorrect submission; - 12-hour phase of open hacks after the end of the round (hacks do not give additional points) - after the end of the open hacking phase, all solutions will be tested on the updated set of tests, and the ratings recalculated - by default, only "trusted" participants are shown in the results table (but the rating will be recalculated for all with initial ratings less than 1400 or you are an unrated participant/newcomer). We urge participants whose rating is 1400+ not to register new accounts for the purpose of narcissism but to take part unofficially. Please do not spoil the contest for the official participants. Only _trusted participants...
. This is a forced measure for combating unsporting behaviour. To qualify as _a trusted participant

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93.
Codeforces Round #629 (Div. 3)
Автор vovuh, история, 6 лет назад, По-русски
Codeforces Round #629 (Div. 3) &lt;almost-copy-pasted-part&gt; Hello! [contest:1328] will start at [contest_time:1328]. You will be offered 6 or 7 problems (or 8) with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have rating 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ACM-ICPC). Thus, during the round, solutions will be judged on preliminary tests, and after the round it will be a 12-hour phase of open hacks. I tried to make strong tests &mdash; just like you will be upset if many solutions fail after the contest is over. You will be given 6 or 7 (or 8) problems and 2 hours to solve them. Note that **the penalty** for the wrong submission in this round (and the following Div. 3 rounds) is **10 minutes**. [Remember] (/blog/entry/59228) that only the <i>trusted participants of the third division</i> will be included in the ...
for combating unsporting behavior. To qualify as a trusted participants of the third division

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94.
Codeforces Round #590 (Div. 3)
Автор vovuh, история, 7 лет назад, перевод, По-русски
Codeforces Round #590 (Div. 3) **UPD**: Special thanks to Mikhail [user:PikMike,2019-10-01] Piklyaev for help with translation and problems discussing, Maksim [user:Ne0n25,2019-10-01] Mescheryakov for problems discussing, Artem [user:Rox,2019-10-01] Plotkin, Daria [user:ZeroAmbition,2019-10-01] Stepanova and Tommy [user:STommydx,2019-10-01] Li for testing the round! **UPD2**: [Editorial](https://codeforces.me/blog/entry/70233) is published! &lt;almost-copy-pasted-part&gt; Hello! [contest:1234] will start at [contest_time:1234]. You will be offered 6 or 7 problems (or 8) with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have rating 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ACM-ICPC). Thus, during the round, solutions will be judged on preliminary tests, and after the round it will be a 12-hour phase of open hacks. I tried ...
for combating unsporting behavior. To qualify as a trusted participants of the third division

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95.
Codeforces Round 981 (Div. 3)
Автор FBI, история, 22 месяца назад, По-английски
Codeforces Round 981 (Div. 3) Hello Codeforces! ![ ](/predownloaded/e0/b6/e0b6aa48b6844684f79ff84fdcea7b8570e0d033.jpg) I am pleased to invite you all to participate in [Codeforces Round 981 (Div. 3)](https://codeforces.me/contests/2033), which will start on [contest_time:2033]. The format of the event will be like any Div. 3 rounds: - 6-8 tasks; - ICPC rules with a penalty of 10 minutes for an incorrect submission; - 12-hour phase of open hacks after the end of the round (hacks do not give additional points) - after the end of the open hacking phase, all solutions will be tested on the updated set of tests, and the ratings recalculated - by default, only "trusted" participants are shown in the results table. I encourage participants with a rating of 1600+ not to create new accounts but to participate unofficially. Only [trusted participants](https://codeforces.me/blog/entry/59228) of the third division will be included in the official standings table. This is a forced measure for co...
. To qualify as a _trusted participant_ of the third division, you must:

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96.
Unusually drastic runtime difference for same code
Автор Qualified, история, 5 лет назад, По-английски
Unusually drastic runtime difference for same code There was some problem with the validator on problems A and G in the recent Div 3 and invalid hacks were considered valid and a lot of solutions got "hacked" because of that. After fixing the issue, the solutions have been rejudged and some AC solutions on G got TLE after being rejudged. But apparently, its not only happening with the submissions to the problems on the recent Div 3, its happening everywhere. This has been brought to my attention by [user:magnus.hegdahl,2021-04-11] who submitted 2 submissions https://codeforces.me/contest/1512/submission/112567753 https://codeforces.me/contest/1512/submission/112578347 <br> Now if you compare these two codes, the only difference is that the second submission has this line ~~~~~ #pragma Voodoo magic("superfast") ~~~~~ which obviously does nothing. Now look at the execution time. One is TLE, the other is AC with 160 ms to spare. This is very weird. Usually if you submit the same code, the difference is at most 60 ms not ...
Qualified

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97.
India ICPC — Amritapuri 2020 Preliminary Round
Автор Ashishgup, 5 лет назад, По-английски
India ICPC — Amritapuri 2020 Preliminary Round Hi Codeforces, **ICPC Amritapuri 2020 Preliminary Round** will be held on [Codedrills](https://codedrills.io/contests/icpc-amritapuri-2020-preliminary-round) today. ![ ](https://storage.googleapis.com/cdcontent/images/Amrita%20Banner.png) **Contest Details** * Contest Link — [ICPC Amritapuri 2020 Preliminary Round](https://codedrills.io/contests/icpc-amritapuri-2020-preliminary-round) * Date & Time — [7 August 2021, Saturday, 18:00 IST](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Amritapuri+Online+Round&iso=20210807T18&p1=438&ah=2&am=30) * Duration — **2.5 Hours** * There will be **6** problems to solve * Will follow standard ICPC scoring system (20 minutes penalty and 1 point per problem) * The questions may not be sorted by difficulty **Selection Criteria** * 700 slots are available for the regional (out of ~4400 teams registered for online round) * Top team from each institution is selected first, to compete in the regional round * Rest of the...
final ranklist and qualified list [here](https://codedrills.io/amritaicpc).

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98.
Codeforces Round 871 (Div. 4)
Автор SlavicG, история, 3 года назад, По-английски
Codeforces Round 871 (Div. 4) Hey, hi Codeforces! It's [user:mesanu,2023-03-18], [user:flamestorm,2023-03-18] and me and we are very excited to invite you to [contest:1829]! It starts on [contest_time:1829]. We worked swiftly to tailor the problems for this contest, so we hope you will enjoy them! We tried to make the statements short, epic and concise. The format of the event will be identical to Div. 3 rounds: - 5-8 tasks; - ICPC rules with a penalty of 10 minutes for an incorrect submission; - 12-hour phase of open hacks after the end of the round (hacks do not give additional points) - after the end of the open hacking phase, all solutions will be tested on the updated set of tests, and the ratings recalculated - by default, only "trusted" participants are shown in the results table (but the rating will be recalculated for all with initial ratings less than 1400 or you are an unrated participant/newcomer). We urge participants whose rating is 1400+ not to register new accounts for the purpose...
. This is a forced measure for combating unsporting behavior. To qualify as _a trusted participant

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99.
Codeforces Round #710 (Div. 3)
Автор Supermagzzz, 5 лет назад, По-русски
Codeforces Round #710 (Div. 3) Hello, Codeforces! \<almost-copy-pasted-part\> Hello! [Codeforces Round #710 (Div. 3)](https://codeforces.me/contest/1506) will start at [contest_time:1506]. You will be offered 7 problems with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have a rating 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ICPC). Thus, during the round, solutions will be judged on preliminary tests, and after the round it will be a 12-hour phase of open hacks. I tried to make strong tests — just like you will be upset if many solutions fail after the contest is over. You will be given 7 problems and 2 hours to solve them. Note that **the penalty** for the wrong submission in this round (and the following Div. 3 rounds) is **10 minutes**. [Remember](https://codeforces.me/blog/entry/59228) that only the trusted partici...
compulsory measure for combating unsporting behavior. To qualify as trusted participants of the third

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100.
Codeforces Round 886 (Div. 4)
Автор SlavicG, история, 3 года назад, По-английски
Codeforces Round 886 (Div. 4) Hello Codeforces! [user:mesanu,2023-07-20], [user:flamestorm,2023-07-20] and I are very excited to invite you to [contest:1850]! It starts on [contest_time:1850]. The format of the event will be identical to Div. 3 rounds: - 5-8 tasks; - ICPC rules with a penalty of 10 minutes for an incorrect submission; - 12-hour phase of open hacks after the end of the round (hacks do not give additional points) - after the end of the open hacking phase, all solutions will be tested on the updated set of tests, and the ratings recalculated - by default, only "trusted" participants are shown in the results table (but the rating will be recalculated for all with initial ratings less than 1400 or you are an unrated participant/newcomer). We urge participants whose rating is 1400+ not to register new accounts for the purpose of narcissism but to take part unofficially. Please do not spoil the contest for the official participants. Only _trusted participants of the fourth division_ wil...
. This is a forced measure for combating unsporting behavior. To qualify as _a trusted participant

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101.
Codeforces Round 1047 (Div. 3)
Автор Proof_by_QED, история, 12 месяцев назад, По-английски
Codeforces Round 1047 (Div. 3) # Hello Codeforces ---------- <center> <br/> <img src="https://i.ibb.co/Y7DHkcpW/2025-09-06-12-40-07.png" alt="2025-09-06-12-40-07" border="0" /> <br/> Thanks to these nerds for 15 winstreak on Hypixel bedwars </center> ---------- [user:SpyrosAliv,2025-09-02] and I are excited to welcome you to participate in [contest:2137] at [contest_time:2137]. You will be given $2$ hours and $15$ minutes to solve $7$ problems. The round will be hosted by rules of educational rounds (extended ICPC). Thus, solutions will be judged on preliminary tests during the round, and after the round, it will be a 12-hour phase of **open hacks**. After open hacks all accepted solutions will be rejudged on successful hacks. The **penalty** for each wrong submission in this round is **10 minutes**. [Remember](https://codeforces.me/blog/entry/59228) that only the trusted participants of the third division will be included in the official standings table. As it is written by link, this is a...
compulsory measure for combating unsporting behavior. To qualify as a _trusted participant of the third

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102.
SIT STAR Contest
Автор MikeMirzayanov, 6 лет назад, По-английски
SIT STAR Contest <b><i>Hello!</i></b> <b><i>Together with colleagues [Schaffhausen Institute of Technology](https://sit.org/) we hold such an event. If you want to study in Switzerland, then perhaps this is your chance!</i></b> <b><i>&mdash; Mike</i></b> Hello, Codeforces! <center> <img alt="SIT" src="https://static.tildacdn.com/tild6536-6661-4864-b937-393639346635/sit_logo_black_short.svg" style="float:right; height: 200px; margin: 10px; max-width:50%;"/> </center> We are thrilled to announce a new SIT STAR Contest by the [Schaffhausen Institute of Technology in Switzerland](https://sit.org/). The winners will have a chance to get a fully-funded Master’s scholarship in Computer Science and Software Engineering. **<font color="red">What is the SIT STAR Contest?</font>** The goal of the SIT STAR Contest is to promote interest in the field of Computer Science and Software Engineering, give students an opportunity to demonstrate their knowledge of programming, and be considered for...
offers qualified students attractive scholarships and the possibility of a second year in one of our

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103.
Codeforces Round #894 (Div.3)
Автор diskoteka, 3 года назад, По-русски
Codeforces Round #894 (Div.3) **☀ ☀ ☀ Hey Codeforces ☀ ☀ ☀** ---------------------------------- Summer is ending, but my team and I are happy to invite you to participate in [contest:1862]. The round will take place on [contest_time:1862]. You will be offered 7 problems with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have a rating of 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ICPC). Thus, solutions will be judged on preliminary tests during the round, and after the round, it will be a 12-hour phase of **open hacks**. You will be given **7 problems** and **2 hours and 15 minutes** to solve them. Note that the **penalty** for the wrong submission in this round is **10 minutes**. [Remember](https://codeforces.me/blog/entry/59228) that only the trusted participants of the third division will be included in the official s...
compulsory measure for combating unsporting behavior. To qualify as a _trusted participant of the third

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104.
Things that occurred since qualifying for ICPC WF
Автор MladenP, 2 года назад, По-английски
Things that occurred since qualifying for ICPC WF Our team qualified for ICPC World Finals 2022 on November 21st, 2021 at SEERC. We will participate at the World Finals this Thursday, April 18th, 2024 in Luxor. We've been thinking how much time has passed since then and about all the things that occurred since. Here are a few of my notes: - 879 days have passed, or 2 years 4 months and 28 days - Got engaged and married - My rating dropped by 116 points - I gained 35kg - My teammates moved into two different countries to study - Novak Đoković won 4 Grand Slams, 3 Masters and 2 ATP Finals - Two major international wars were (re)started - Messi became World Champion - India became most populous country - Queen Elizabeth died - Everybody started caring about AI again I'm sure many of you have the same experience as us, leave any cool facts in the comments :) Best of luck to everyone, especially those not directly competing with us! P.S. Don't take this as a dig at ICPC &mdash; while I dislike this long pause, some ...
this grand event. One thing they could fix is not knowing whether we qualified until last August..., Our team qualified for ICPC World Finals 2022 on November 21st, 2021 at SEERC. We will participate

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105.
Northern Eurasia Finals 2020: Offline
Автор NercNews, 5 лет назад, По-русски
Northern Eurasia Finals 2020: Offline <img src="/predownloaded/c0/fe/c0fe3f2c5397274930f617ee822bdaecd5966927.jpg" align="right" style="height: 255px; margin: 10px;" alt="text"/> Hello everyone! After all online qualifiers, we are pleased to announce that the **Northern Eurasia Finals** and ICPC 2021 semi-final offline stage will take place this weekend on **April 3-4**! <a href="https://youtu.be/65oO4Zauvgc" style="font-size: 15.0px;padding: 8.0px 14.0px;background-color: rgb(240, 170, 10);color: white;">ICPCLive broadcast</a> <a href="http://nerc.itmo.ru/archive/2020/standings.html" style="font-size: 15.0px;padding: 8.0px 14.0px;background-color: rgb(76, 131, 195);color: white;">Standings</a> <a href="https://codeforces.me/contests/1510" style="font-size: 15.0px;padding: 8.0px 14.0px;background-color: rgb(76, 131, 195);color: white;">Mirror</a> <a href="http://nerc.itmo.ru/archive/2020/problems.pdf" style="font-size: 15.0px;padding: 8.0px 14.0px;background-color: rgb(76, 131, 195);color: white;">Problems</...
**UPD** today were qualified for ICPC 2021 World Finals next 12 teams:

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106.
Codeforces Round #909 (Div. 3)
Автор zwezdinv, 3 года назад, перевод, По-русски
Codeforces Round #909 (Div. 3) Hello, Codeforces! ☀️☀️☀️ We are glad to invite you to our second [Div. 3](https://codeforces.me/contest/1899) round, which will take place on [contest_time:1899]. **The round will be rated for all participants with rating less than 1600.** You will be given 7 tasks and 2 hours 15 minutes to solve it. The tasks were prepared by [user:zwezdinv,2023-11-15], [user:meowcneil,2023-11-15], [user:EJIC_B_KEDAX,2023-11-15], [user:Sokol080808,2023-11-15] and [user:molney,2023-11-15]. [Remember](https://codeforces.me/blog/entry/59228), that only _trusted Div. 3 participants_ will be included in official standings. To qualify as trusted participant you need: 1. Participate in at least five rounds (and solve at least one problem in each of them) 2. Do not to have a point 1900 or greater in the rating We would like to thank: - [user:MikeMirzayanov,2023-11-15] for Polygon and Codeforces - Coordinators [user:Vladosiya,2023-11-15] and [user:Gornak40,2023-11-15] for excellent ...
be included in official standings. To qualify as trusted participant you need:

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107.
Codeforces Round 929 (Div. 3)
Автор erniepsycholone, 3 года назад, По-английски
Codeforces Round 929 (Div. 3) _“It is not important to be better than someone else, but to be better than you were yesterday.”_ — Master Oogway, Kung Fu Panda Hello, Codeforces! We are proud to present [contest:1933], and we hereby invite all of you to take part in it. This round will start on [contest_time:1933]. You will have **2 hours and 15 minutes** to solve **7 problems**. The **penalty** for a wrong submission is equal to **10 minutes**. This round will be rated for participants with ratings lower than 1600. However, all of you who wish to take part and have a rating of 1600 or higher, are welcome to register for the round unofficially. The round will be hosted by rules of educational rounds (extended ICPC). Thus, solutions will be judged on preliminary tests during the round, and after the round, it will be a 12-hour phase of open hacks. Remember that only the trusted participants of the third division will be included in the official standings table. As stated in [this blog](https://codeforce...
qualify as a trusted participant of the third division, you must:

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108.
Codeforces Round 1090 (Div. 4)
Автор macaquedev, 5 месяцев назад, По-английски
Codeforces Round 1090 (Div. 4) Hello Codeforces!! I ([user:macaquedev,2026-04-02]) and [user:damamila,2026-04-02] would like to invite all of you to my long-awaited [contest:2218] on [contest_time:2218]! You will be given $6$ or $7$ problems, and you will be given $2$ hours and $15$ minutes to solve them. We hope that you will find the problems interesting, and that all participants will learn at least $6$, $7$ or (ideally) $67$ things. The format of the event will be identical to Div. 3 rounds: - ICPC rules with a penalty of 10 minutes for an incorrect submission; - 12-hour phase of open hacks after the end of the round (hacks do not give additional points) - after the end of the open hacking phase, all solutions will be tested on the updated set of tests, and the ratings recalculated - by default, only "trusted" participants are shown in the results table (but the rating will be recalculated for all with initial ratings less than 1400 or you are an unrated participant/newcomer). We urge participants...
. This is a forced measure for combating unsporting behavior. To qualify as _a trusted participant

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109.
Codeforces Round #650 (Div. 3)
Автор Stepavly, история, 6 лет назад, По-русски
Codeforces Round #650 (Div. 3) Hello, Codeforces! \<almost-copy-pasted-part> Hello! [contest:1367] will start at [contest_time:1367]. You will be offered 6 problems (one of them will have subtasks) with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have a rating 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ACM-ICPC). Thus, during the round, solutions will be judged on preliminary tests, and after the round it will be a 12-hour phase of open hacks. We tried to make strong tests — just like you will be upset if many solutions fail after the contest is over. You will be given 6 problems and 2 hours to solve them. Note that **the penalty** for the wrong submission in this round (and the following Div. 3 rounds) is **10 minutes**. [Remember](https://codeforces.me/blog/entry/59228) that only the trusted participants of the third ...
compulsory measure for combating unsporting behavior. To qualify as trusted participants of the third

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110.
Complaint against ACPC
Автор aka.Sohieb, история, 10 лет назад, По-английски
Complaint against ACPC Hello everyone! 2 weeks ago the ACM-ICPC Arab regional contest was held. Our [Team](http://codeforces.me/team/24593) participated in it after earning gold medals at the ECPC ([3rd place](https://icpc.baylor.edu/regionals/finder/ecpc-2016/standings)). Our Sad Story ------------------ During the contest we came upon a problem that no other team has attempted yet, and we actually submitted about 6 solutions for it, with the first two getting TLE response and the other four getting WA. After failing to see what the problem is with our code we decided to leave it be and concern ourselves with other problems, that was nearly at minute 140. After exactly 194 minutes from the start of the contest another team attempted the problem only to get WA. Also, at minute 214 another team (which happens to be the champion of both the ECPC and the ACPC) submitted a solution and also got a WA. Then after a few minutes we find that there was some problems with the judge's solu...
Now, 9 teams from our region have all been qualified to the WF (6 of them were Egyptians) and we

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111.
Teams qualified for ICPC Asia West Continent Championship 2025
Автор Pols_Agyi_Pols, 19 месяцев назад, По-английски
Teams qualified for ICPC Asia West Continent Championship 2025 The list of teams qualified for the ICPC Asia West Continent Championship 2025 has been [posted here](https://wc.indiaicpc.in/?page_id=647). So far, there are 65 teams there. Please comment the codeforces handles of your university's team and I will add them to the list. Asia West Region ======================== | Team Name | Institute | Member 1 | Member 2 | Member 3 | Team Rating (Max.) | Team Rating (Curr.) | |----------------- ----------|--------------------------------|----------|----------|----------|----------|----------| |on_the_spectrum|Indian Institute of Technology Delhi|[user:MridulAhi,2025-02-06]|[user:etherinmatic,2025-02-06]|[user:BladeRunner,2025-02-06]|2642|2558| |SubtasksWhere|International Institute of Information Technology, Hyderabad|[user:shiven,2025-02-06]|[user:SmolBrain,2025-02-06]|[user:hariaakash646,2025-02-06]|2642|2541| |404_solution_not_found|Indian Institute of Technology Indore|[user:nishkarsh,2025-02-06]|[use...
Teams qualified for ICPC Asia West Continent Championship 2025, The list of teams qualified for the ICPC Asia West Continent Championship 2025 has been [posted

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112.
underwhelmed
Автор Lyde, история, 2 года назад, По-английски
underwhelmed You guys may not have seen a light-hearted blog in a little while. So I made one. Enjoy! <spoiler summary="Backstory"> You may read [that previous blog from Millienium](https://codeforces.me/blog/entry/123126). Otherwise, there isn't much. </spoiler> So after that miraculous Silver Medal run in that 2023 ICPC Asia Hue City Regional Contest, our team went back to normal life and waited for more information. A few days later, we were announced as a participant in the 2024 ICPC Asia Pacific Championship (or in short, Super Regional), which is nice, although it's expected. So back to training, I guess? In that gap time between the Regional and Super Regional contests, we still kept that positive mentality and practiced together like normal. The Lunar New Year and end-term exams from our university took a lot of time from us, but everything went pretty well and it was a lot of fun. Actually, my most memorable moment at that time was when I found out the Super Regional Contest...
will come to people who believe. And to the ones that qualified for ICPC World Finals like us as, ) that out of five winners of each regional automatically qualified for the World Finals, one team, . I did pretend to be a person who qualified for the ICPC World Finals, but deep inside me, I feel, qualified for ICPC World Finals. A message from 2 weeks ago.

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113.
LAZY solution to problem D in Codeton round 8 + PYTHON solution
Автор drdilyor, история, 2 года назад, По-английски
LAZY solution to problem D in Codeton round 8 + PYTHON solution Heyo! If you tried to solve problem D you have probably ended up trying to optimize this algorithm: <spoiler summary="C++ brute force"> ``` // input int n, k; cin >> n >> k; vector arr(n, vector<int>(n)); for (int i = 0; i < n;i++) for (int j = i; j < n; j++) cin >> arr[i][j]; vector dp(n+2, vector<int>()); dp[n] = dp[n+1] = {0}; for (int i = n-1; i >= 0; i--) { vector<int> cur; for (int j = i-1; j < n; j++) { // prepare to merge by adding a[i][j] vector<int> tomerge = dp[j+2]; if (j >= i) { for (int& x : tomerge) x += arr[i][j]; } vector<int> merged; merge(cur.begin(), cur.end(), tomerge.begin(), tomerge.end(), back_inserter(merged), greater()); cur = merged; } dp[i] = cur; } // output top k values ...
import Control.Monad import qualified Data.ByteString.Char8 as B import Data.Maybe

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114.
X BSUIR Open Programming Championship
Автор hloya_ygrt, 6 лет назад, По-русски
X BSUIR Open Programming Championship <div style="text-align: center; margin-bottom: 10px;"> <img src="/predownloaded/8e/c4/8ec47dc8ee73d992e81bb7974a1dde9590a4490f.png" /> </div> The **X BSUIR Open Programming Championship** will be held from March 21 till May 7, 2020 (Minsk, Belarus). Semifinal is over, upsolving is open and standings are unfreezed. Thanks to the problemsetters: [user:aropan,2016-11-08], [user:teleport,2016-08-06], [user:wilcot,2020-04-08], [user:ShavelV,2020-04-08], [user:rui-de,2020-04-08], [user:Vladik,2020-04-08], [user:netman,2016-11-08]. Results here: [students](https://contest.yandex.ru/contest/17437/standings?lang=en) и [school](https://contest.yandex.ru/contest/17438/standings?lang=en). **UPD3:** Registration deadline comes in **30 hours**. **UPD:** [Telegram channel](https://t.me/bsuir_open_x_news). There's a link there to a chat, where you can talk to other participants and team up. **UPD2:** With respect to the situation in the world, organizing committee decided to mak...

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115.
ICPC Amritapuri 2020 Regionals — Live Updates
Автор Ashishgup, 5 лет назад, По-английски
ICPC Amritapuri 2020 Regionals — Live Updates Hello everyone! [user:T1duS,2021-08-14], [user:kshitij_sodani,2021-08-14] and I will be capturing the live updates of the Amritapuri 2020 Regionals, for teams to later refer to first-solves and the state of ranklist after various times. It is inspired by similar blogs in the past, like[ this](https://blog.codechef.com/2019/12/08/icpc-kharagpur-regionals-2019-20-live-updates/), for example. **Important Information**: - Rank List (Scoreboard): https://codedrills.io/contests/icpc-amritapuri-2020-regional-round/scoreboard - Contest Page: https://codedrills.io/contests/icpc-amritapuri-2020-regional-round - Contest Blog: https://codeforces.me/blog/entry/93818 - There are **726** qualified teams who will be competing for the world finals slots from this regional! - Contest Duration: **4 hours**. - Tentative Start Time: **18:30 IST** **Announcements**: - All problems have a memory limit of **1GB**, and solutions that exceed this would be marked as RTE instead of MLE due...
Blog: https://codeforces.me/blog/entry/93818 - There are **726** qualified teams who will be

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116.
Codeforces Round #644 (Div. 3)
Автор Supermagzzz, история, 6 лет назад, По-русски
Codeforces Round #644 (Div. 3) Hello, Codeforces! We have planned this round as a Div. 4, but testing showed us, that problems are more suitable for Div. 3. **Therefore, instead of the previously announced Div. 4 we will hold Div. 3 round**. \<almost-copy-pasted-part\> Hello! [Codeforces Round #644 (Div. 3)](https://codeforces.me/contest/1360) will start at [contest_time:1360]. You will be offered 8 problems with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have a rating 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ACM-ICPC). Thus, during the round, solutions will be judged on preliminary tests, and after the round it will be a 12-hour phase of open hacks. I tried to make strong tests — just like you will be upset if many solutions fail after the contest is over. You will be given 8 problems and 2 hours to solve them. Not...
compulsory measure for combating unsporting behavior. To qualify as trusted participants of the third

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117.
Educational Codeforces Round 141 [Rated for Div. 2]
Автор awoo, история, 4 года назад, По-русски
Educational Codeforces Round 141 [Rated for Div. 2] Hello Codeforces! On [contest_time:1783] [contest:1783] will start. Series of Educational Rounds continue being held as [Harbour.Space University](https://harbour.space/) initiative! You can read the details about the cooperation between [Harbour.Space University](https://harbour.space/) and Codeforces in the <a href="http://codeforces.me/blog/entry/51208">blog post</a>. This round will be **rated for the participants with rating lower than 2100**. It will be held on extended ICPC rules. The penalty for each incorrect submission until the submission with a full solution is 10 minutes. After the end of the contest, you will have 12 hours to hack any solution you want. You will have access to copy any solution and test it locally. You will be given **6 or 7 problems** and **2 hours** to solve them. The problems were invented and prepared by Adilbek [user:adedalic,2023-01-07] Dalabaev, Vladimir [user:vovuh,2023-01-07] Petrov, Ivan [user:BledDest,2023-01-07] Androsov, Ma...
teams who already qualified for the world finals ICPC or are aiming that high._ - _**Division B

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118.
Teams going to the 2025 ICPC Asia Pacific Championship
Автор DeMen100ns, история, 20 месяцев назад, По-английски
Teams going to the 2025 ICPC Asia Pacific Championship This year, the 2025 ICPC Asia Pacific Championship will be hosted by National University of Singapore. The list of 65 qualified teams was posted on the [official website](https://icpc-apac-2025.vercel.app/competition/teams). If you know the Codeforces handles of any team that is not yet filled in, please let me know so I can add them. ## Invited Teams <style type="text/css"> .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;font-size:14px; overflow:hidden;padding:10px 5px;word-break:normal;} .tg th{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;font-size:14px; font-weight:normal;overflow:hidden;padding:10px 5px;word-break:normal;} .tg .tg-0lax{text-align:left;vertical-align:top} </style> <table class="tg"> <thead> <tr> <th class="tg-0lax">Regional</th> <th class="tg-0lax">Institution</th> <th class="tg-0lax">Team</th> ...
Singapore. The list of 65 qualified teams was posted on the [official website](https://icpc-apac-2025

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119.
ICPC WF 2026 Team List
Автор ismailfateen, 8 месяцев назад, По-английски
ICPC WF 2026 Team List Hello Codeforces, Earlier this month, the ACPC (African and Arab Collegiate Programming Championship) concluded, determining the teams qualified for the ICPC World Finals from our region. I decided to write a blog post to gather the full team list somewhere (yes, I know this is very early and most championships are still in March, but I'm so excited anyway, and I already had the script for the ACPC list, so why not!) To add your team to the list, please comment these details: - Your region - Your country - Your university - Your team name - Team members' handles Wish everyone the best of luck in preparing for the ICPC, and can't wait to meet you all! <h2>Northern Eurasia</h2> <table> <tr> <th>Country</th> <th>University</th> <th>Team Name</th> <th>Member 1</th> <th>Member 2</th> <th>Member 3</th> <th>Team Rating</th> </tr> <tr> <td>Russia</td> <td>HSE University</td> <td>FFTilted</td> <td><a href="https://codeforces.me/profile/teraqqq" style="color...
, determining the teams qualified for the ICPC World Finals from our region.

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120.
ICPC North America Championship: Call for Fun Facts
Автор SecondThread, 3 года назад, По-английски
ICPC North America Championship: Call for Fun Facts Fun Facts about NAC Teams ================== Are you or someone you know attending the North America Programming Camp? If so, we'd love to get some fun facts about the teams that are here! Please submit your fun facts [in this google form](https://forms.gle/6urswk25LchFw2uR6), or send them in a direct message to me, [user:SecondThread,2023-05-27] on Codeforces! ![ ](https://github.com/WumboGames/WumboGames.github.io/blob/master/cfPictures/nac.jpg?raw=true) What kind of facts are you looking for? ------------------ We're looking for anything exciting, interesting, or varied about your team that you're willing to share. Some great examples that we've seen in the past include: - I play Smash Melee competitively in my free time - One of our team members (his_handle) is getting married within a week of finals - I'm surprisingly not actually a Computer Science major, instead I'm majoring in x and plan to use it for y. - 2/3 of our team uses the non-C++ programming langua...
language X. - This weird thing happened at regionals when we qualified. - Our team practiced pretending

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121.
The 2026 Universal Cup Finals Announcement
Автор Qingyu, 7 месяцев назад, По-английски
The 2026 Universal Cup Finals Announcement Hello Codeforces! I am excited to announce that The 2026 Universal Cup Finals will be held in Shanghai, China from May 7 to 12, 2026! <center style="margin-top:20px;"> <img src="/predownloaded/40/72/40729f130c6d86d6ec06078b24e2f5c8fd61e5dc.png" alt="2026 ucup finals" style="zoom:80%;" /> </center> <center style="margin-top:20px;"> <img src="/predownloaded/b8/87/b887ffab8b998244f31367f6867d25c1ccfc20f7.png" alt="lianqiu" style="zoom:80%;" /> </center> Based on the results of The 3rd Universal Cup Online Stages and The 3rd Universal Cup Semifinals, the Universal Cup Scientific Committee will start promoting teams to the Finals according to [this rule](https://ucup.ac/news/the-3rd-ucup-finals-qualification-rules/). Invitations will be delivered through email. <!-- more --> ## Competition Overview Universal Cup is a non-profit organization dedicated to providing practical training opportunities for teams aspiring to improve their algorithmic competition skills. At ...

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122.
Coding & Algorithms Tournament (CAT) 2026 Final Round — Online Mirror
Автор jonathanirvings, 3 месяца назад, По-английски
Coding & Algorithms Tournament (CAT) 2026 Final Round — Online Mirror Hi, ![ ](/predownloaded/9e/9e/9e9ec904a51fffcf41d260582ba7a4df0ad1ae77.png) We would like to invite you to participate in the live online mirror contest of Coding & Algorithms Tournament (CAT) 2026 Final Round. [Coding & Algorithms Tournament (CAT)](https://catournament.org/) is an open Indonesian nationwide programming competition organized by [Ecommurz](https://www.instagram.com/ecommurz/) and [CSRelatedCompetitions](https://www.instagram.com/csrelatedcompetitions/) as a celebration of programming skills. We are proud to announce [Google Cloud](https://cloud.google.com), [Virtu Financial](https://virtu.com), and [Indosat Ooredoo Hutchison](https://ioh.co.id) as our Gold Partners, [Hudson River Trading](https://hudsonrivertrading.com), [Dana](https://dana.id), and [Candor Analytica Research](https://www.candoranalytica.com/) as our Silver Partners, and [BINUS University](https://binus.ac.id/) as our Venue Partner. More than 2,200 Indonesians registered for this competition...
Semi Final round, [30 great programmers](https://catournament.org/final-list) havequalified to the

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123.
My Meta hacker cup experience
Автор hxu10, история, 21 месяц назад, По-английски
My Meta hacker cup experience I have participated in the Meta Hacker Cup for four consecutive years: 2021, 2022, 2023, and 2024. After receiving the T-shirt today, I would like to share my experiences and progress. **2021: A newbie want a T shirt** ![2021](https://github.com/user-attachments/assets/9abd55cc-3008-47ba-9399-a301a35bed51) This year, I was a complete newbie. The first two rounds lasted over 24 hours, which gave me more time to solve the problems, so my rank looked good. However, Round 2 was only 3 hours long, and it turned out to be a complete disaster for me. I got stuck on the first problem and doubted my solution repeatedly. Although I finally solved it 30 minutes before the contest ended, I had no time left for the other problems. In the end, I only solved one problem and ranked 2700+, which meant I didn’t even qualify for a T-shirt. I shared my result with some Meta HR representatives, but they didn’t respond. I applied to several positions at Meta, but my resume was rejected. I also...
D was much easier. If I had focused on Problem D earlier, I might have qualified for Round 3. Still, all three rounds and historically qualified for Round 3! My goal this year was to win the coveted "Top, problem, there was a great chance I could have qualified for Round 3., First, I wanted to challenge myself with Google Code Jam again because, although Iqualified for, I also participated in the Google Code Jam Round 2 and ranked 1000+, but I failed toqualify for

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124.
Codeforces Round 964 (Div. 4)
Автор SlavicG, история, 2 года назад, По-английски
Codeforces Round 964 (Div. 4) Hello Codeforces! [user:flamestorm,2024-08-05], [user:mesanu,2024-08-05] and I want to invite you to [contest: 1999]. It starts on [contest_time: 1999]. The format of the event will be identical to Div. 3 rounds: - 5-8 tasks; - ICPC rules with a penalty of 10 minutes for an incorrect submission; - 12-hour phase of open hacks after the end of the round (hacks do not give additional points) - after the end of the open hacking phase, all solutions will be tested on the updated set of tests, and the ratings recalculated - by default, only "trusted" participants are shown in the results table (but the rating will be recalculated for all with initial ratings less than 1400 or you are an unrated participant/newcomer). Additionally, there might be problems that are interactive, so please read the guide of [interactive problems](https://codeforces.me/blog/entry/45307) before the contest. We urge participants whose rating is 1400+ not to register new accounts for the purpo...
. This is a forced measure for combating unsporting behaviour. To qualify as _a trusted participant

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125.
Thoughts on Coaching Grays?
Автор TheScrasse, история, 4 года назад, По-английски
Thoughts on Coaching Grays? Hello everyone, I'm asking for some help about how to train my schoolmates for Regional OI. Most of them have a fairly good MO background, so they are supposed to get good even if they don't practice at home (i.e., I think the $2$ hours a week at school should be enough to qualify to National OI). However, the results so far are quite disappointing: I feel I'm doing something really wrong. #### Format of Regional OI The statements are [here](https://territoriali.olinfo.it/) (requires registration). Each year, there are usually - $2$ easy problems (let's say A, B); - $1$ standard DP with a twist (C); - $1$ standard graph problem with a twist (D). A < B < C < D (in order of difficulty and points). They are similar to Div. 3 C, D, E, F. Solving A and C is enough to go to National OI. #### Schedule of this year The training started in October 2021. - October \- November: introduction to C++ and STL (in the [CPH](https://cses.fi/book/book.pdf), they correspond to c...
potential to qualify to National OI, but I feel I wasted that potential. Moreover, I don't want to, ., I think the $2$ hours a week at school should be enough to qualify to National OI). However, the

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126.
Deadline24 2017 — Qualifying Round and GYM replay of previous edition
Автор Errichto, 9 лет назад, По-английски
Deadline24 2017 — Qualifying Round and GYM replay of previous edition Hi everybody. Deadline24 is an international programming marathon, organized continually since 2009 by Future Processing. During the contest, the teams of three tackle algorithmic problems. The marathon is composed of two phases. The qualifying round starts on March 12. For 5 clock hours, the teams will be solving tasks and generating responses assessed by the verification server. This stage of the competition is remote. Then, the best teams of the qualifying round will meet at the 24-hour finals held on April 22-23, 2017, in Katowice (Poland). **The teams can sign up until March 9**, 2017 (23.59 CET). Registration is available on the contest website [www.deadline24.pl](//www.deadline24.pl). ------------------ You can get familiar with the type and difficulty level of the tasks in the Qualifying round by competing in the GYM contest on this Thursday and will last 5 hours (check your timezone [here](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Deadline24+20...

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127.
Codeforces Round 927 (Div. 3)
Автор pashka, история, 3 года назад, перевод, По-русски
Codeforces Round 927 (Div. 3) Hello! On [contest_time:1932] will start [contest:1932], the next Codeforces round for the third division. **The round is based on problems from [JetBrains Academy Youth Challenge](https://lp.jetbrains.com/youth-challenge/). If you participated in it, please don't participate in this round.** Problems for this round are prepared by [user:denk,2024-02-17], [user:step_by_step,2024-02-17], [user:goncharovmike,2024-02-17], [user:ikrpprppp,2024-02-17], [user:pashka,2024-02-17], [user:Vladosiya,2024-02-17] and [user:MikeMirzayanov,2024-02-17]. Thank you very much [user:awoo,2024-02-17], [user:BledDest,2024-02-17], [user:buyolitsez,2024-02-17], [user:EgorUlin,2024-02-17], [user:Gojova,2024-02-17], [user:GrandFruit,2024-02-17], [user:Hello_zoka,2024-02-17], [user:petyb,2024-02-17], [user:scanhex,2024-02-17], [user:senjougaharin,2024-02-17], [user:shnirelman,2024-02-17], [user:SomethingNew,2024-02-17], [user:Toy_mouse,2024-02-17], [user:Zandler,2024-02-17] for testing the round. As ...
compulsory measure for combating unsporting behaviour. To qualify as a trusted participant of the third

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128.
Codeforces Round #762 (Div. 3)
Автор Vladosiya, 5 лет назад, По-русски
Codeforces Round #762 (Div. 3) Hello! [contest:1619] will start at [contest_time:1619]. You will be offered 7-8 problems with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have a rating of 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ACM-ICPC). Thus, solutions will be judged on preliminary tests during the round, and after the round, it will be a 12-hour phase of open hacks. You will be given 7-8 problems and 2 hours and 15 minutes to solve them. Note that the penalty for the wrong submission in this round (and the following Div. 3 rounds) is 10 minutes. Remember that only the trusted participants of the third division will be included in the official standings table. As it is written by link, this is a compulsory measure for combating unsporting behavior. To qualify as a trusted participant of the third division, you must: ...
behavior. To qualify as a trusted participant of the third division, you must:

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129.
Codeforces Round 859 (Div. 4)
Автор SlavicG, история, 3 года назад, По-английски
Codeforces Round 859 (Div. 4) Hello Codeforces! [user:mesanu,2023-03-18], [user:flamestorm,2023-03-18] and I are very excited to invite you to [contest:1807]! It starts on [contest_time:1807]. The format of the event will be identical to Div. 3 rounds: - 5-8 tasks; - ICPC rules with a penalty of 10 minutes for an incorrect submission; - 12-hour phase of open hacks after the end of the round (hacks do not give additional points) - after the end of the open hacking phase, all solutions will be tested on the updated set of tests, and the ratings recalculated - by default, only "trusted" participants are shown in the results table (but the rating will be recalculated for all with initial ratings less than 1400 or you are an unrated participant/newcomer). We urge participants whose rating is 1400+ not to register new accounts for the purpose of narcissism but to take part unofficially. Please do not spoil the contest for the official participants. Only _trusted participants of the fourth division_ wil...
. This is a forced measure for combating unsporting behavior. To qualify as _a trusted participant

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130.
Codeforces Round 1080 (Div. 3)
Автор chromate00, 7 месяцев назад, По-английски
Codeforces Round 1080 (Div. 3) Oh hello there. I, [user:chromate00,2026-02-14], am back! Oh no, I hope you are not misunderstanding me, I'm not pulling a joke on the announcement this time. I'm too busy for that right now. So here's the <strike>(mostly copy-pasted)</strike> announcement of [contest:2195]. Anyways. Starting from [contest_time:2195], you will be given **$\mathbf{7}$ or $\mathbf{8}$ problems** to be solved in **$\mathbf{2.5}$ hours**. The round will be hosted by rules of educational rounds (extended ICPC). Thus, all solutions will be judged on preliminary tests during the round, and after the round, there will be a 12-hour phase of **open hacks**. After the open hack phase, all accepted solutions will be rejudged on successful hacks. Also, note that there is no score distribution but the usual penalty of **10 minutes** for each wrong submission, following the rules of educational rounds. [Remind](https://codeforces.me/blog/entry/59228) yourself that only the trusted participants of the third ...
a compulsory measure for combating unsporting behavior. To qualify as a trusted participant of the

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131.
IICPC Codefest Prelims Mirror
Автор Dominater069, история, 7 месяцев назад, По-английски
IICPC Codefest Prelims Mirror Hi, The IICPC Codefest Prelims were held on 31st of January, and you can now solve the problems on [Codechef](https://www.codechef.com/CDFESTMR2026?order=desc&sortBy=successful_submissions). The problems were authored by [user:arpit_kr,2026-02-04], [user:synthborne,2026-02-04] and myself. I would also like to thank [user:244mhq,2026-02-04], [user:awoo,2026-02-04], [user:Iceknight1093,2026-02-04], [user:Soumil69,2026-02-04] and [user:Dragmon,2026-02-04] for testing. Congratulations to all the participants who qualified. The entire ranklist will be mailed soon. Top 5: (Global) - Rank $1$ : [user:yuto1115,2026-02-04] (9 / 9) - Rank $2$ : [user:ttamx,2026-02-04] (9 / 9) - Rank $3$ : [user:maomao90,2026-02-04] (8 / 9) - Rank $4$ : [user:smolbrain,2026-02-04] (8 / 9) - Rank $5$ : [user:weirdflexbutok,2026-02-04] (7 / 9) Top 5: (India) - Rank $1$ : [user:smolbrain,2026-02-04] (8 / 9) - Rank $2$ : [user:weirdflexbutok,2026-02-04] (7 / 9) - Rank $3$ : [us...
Congratulations to all the participants who qualified. The entire ranklist will be mailed soon.

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132.
VNOI Cup 2022 Round 1 [Mirror invitation]
Автор darkkcyan, история, 4 года назад, По-английски
VNOI Cup 2022 Round 1 [Mirror invitation] Hello Codeforces! <!-- Short sentence for invitation --> We are glad to invite you to take part in mirror round of [the first round of VNOI Cup](https://oj.vnoi.info/contest/vnoicup22_r1_mirror), which will take place [at 13:00 UTC, on this Saturday, 18th June](https://www.timeanddate.com/worldclock/fixedtime.html?msg=%5BMirror%5D%20VNOI%20Cup%202022%20-%20Round%201&iso=2022-06-18T13:00:00), and it is hosted on our builtin platform &mdash; [VNOJ](https://oj.vnoi.info/)! <center> <img src="/predownloaded/5a/27/5a27775a5a9c31eea4eb942d31bdd4ade1ef35e7.png" alt="round1-poster" /> </center> <!-- Ask qualified participants to take part in the official round --> **If you are Vietnamese and _qualified_ according to these rules mentioned on [this post](https://cup.vnoi.info/rule/)**, please consider taking part in [the official round](https://oj.vnoi.info/contest/vnoicup22_r1)! <!-- Introduce VNOI --> VNOI Cup is a Competitive Programming competition held by VNOI (Vietnam Oly...
**If you are Vietnamese and

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133.
The 8th Turing Cup Tournament
Автор dXqwq, 5 недель назад, По-английски
The 8th Turing Cup Tournament **UPD 1: Submitting a recording will be required in order to win (division top 3 or best female coder) prize. The format of the recording & rules are the same with [AGC](https://atcoder.jp/posts/agc_proctoring_en).** **UPD 2: We've noticed that contest is unavailable in the X-Camp Contest System. We are investigating.** **UPD 3: International contestants should also register at XinYouDui contest system.** **UPD 4: You should submit your video file(or url) to `[email protected]`.** # 2026 · The 8th Turing Cup Tournament The Turing Cup is an invitational competition that is organized by one of the most successful informatics competition teams in China, the XinYouDui and partner with X-Camp Academy. ## Timeline | Event | Time (UTC+8) | |----------------------|-----------------------------------------| | Registration Time | Jun 18, 2026, 06:00 PM &mdash; Jul 30, 2026, 12:29 PM | | Opening Ceremony | Jul 30, 2026, 07:...

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134.
Codeforces Round 995 (Div. 3)
Автор BledDest, история, 20 месяцев назад, перевод, По-русски
Codeforces Round 995 (Div. 3) Hello, Codeforces! On [contest_time:2051] the [contest:2051] will start. The round will contain 7 problems, which are mostly suited for participants with rating below 1600 (or we hope so). Although, as usual, participants with rating of 1600 and greater can register for the round unofficially. Participants with rating below 1600 can also use unrated registration to participate unofficially. The round will be hosted by rules of educational rounds (extended ACM-ICPC). Thus, during the round, solutions will be judged on preliminary tests, and after the round it will be a 12-hour phase of open hacks (we hope that our tests are strong enough, so there won't be too many solutions hacked during this phase). You will have to solve **7 problems** in **2 hours and 15 minutes**. The penalty for a wrong submission is equal to **10 minutes**. [We remind you](https://codeforces.me/blog/entry/59228) that only _the trusted participants of the third division_ will be included in the offic...
qualify as _a trusted participant of the third division_, you must:

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135.
Codeforces Round #636 (Div. 3)
Автор vovuh, история, 6 лет назад, По-русски
Codeforces Round #636 (Div. 3) &lt;almost-copy-pasted-part&gt; Hello! [contest:1343] will start at [contest_time:1343]. You will be offered 6 or 7 problems (or 8) with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have rating 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ACM-ICPC). Thus, during the round, solutions will be judged on preliminary tests, and after the round it will be a 12-hour phase of open hacks. I tried to make strong tests &mdash; just like you will be upset if many solutions fail after the contest is over. You will be given 6 or 7 (or 8) problems and 2 hours to solve them. Note that **the penalty** for the wrong submission in this round (and the following Div. 3 rounds) is **10 minutes**. [Remember] (/blog/entry/59228) that only the <i>trusted participants of the third division</i> will be included in the ...
for combating unsporting behavior. To qualify as a trusted participants of the third division

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136.
Codeforces Round #878 (Div.3)
Автор diskoteka, 3 года назад, По-русски
Codeforces Round #878 (Div.3) **Hey Codeforces (ﾉ◕ヮ◕)ﾉ*:･ﾟ✧** ---------------------------------- My team and I are happy to invite you to participate in [contest:1840]. The round will take place on [contest_time:1840]. You will be offered 8 problems with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have a rating of 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ICPC). Thus, solutions will be judged on preliminary tests during the round, and after the round, it will be a 12-hour phase of **open hacks**. You will be given **8 problems** and **2 hours and 15 minutes** to solve them. One of the problems in this round is interactive. Don't forget to read the [guide on interactive problems](https://codeforces.me/blog/entry/45307). Note that the **penalty** for the wrong submission in this round is **10 minutes**. [Remember](http...
compulsory measure for combating unsporting behavior. To qualify as a _trusted participant of the third

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137.
Codeforces Round #839 (Div. 3)
Автор awoo, история, 4 года назад, По-русски
Codeforces Round #839 (Div. 3) Привет, Codeforces! On [contest_time:1772], [contest:1772] will start. This is a usual round for the participants from the third division. The round will contain 7 problems, which are mostly suited for participants with rating below 1600 (or we hope so). Although, as usual, participants with rating of 1600 and greater can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ICPC). Thus, during the round, solutions will be judged on preliminary tests, and after the round it will be a 12-hour phase of open hacks. You will be given **7 problems** and **2 hours and 15 minutes** to solve them. The penalty for a wrong submission is equal to **10 minutes**. [We remind you](https://codeforces.me/blog/entry/59228) that only the _trusted participants of the third division_ will be included in the official standings table. As it is written on the blog which you can access by this link, this is a compulsory measure for combating unspor...
qualify as a _trusted participant of the third division_, you must:

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138.
Codeforces Round 913 (Div. 3)
Автор Vladosiya, история, 3 года назад, По-русски
Codeforces Round 913 (Div. 3) Hello! [contest:1907] will start at [contest_time:1907]. You will be offered 6-8 problems with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have a rating of 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ICPC). Thus, solutions will be judged on preliminary tests during the round, and after the round, it will be a 12-hour phase of **open hacks**. You will be given **6-8 problems** and **2 hours and 15 minutes** to solve them. Note that the **penalty** for the wrong submission in this round is **10 minutes**. [Remember](https://codeforces.me/blog/entry/59228) that only the trusted participants of the third division will be included in the official standings table. As it is written by link, this is a compulsory measure for combating unsporting behavior. To qualify as a _trusted participant of the thi...
compulsory measure for combating unsporting behavior. To qualify as a _trusted participant of the third

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139.
Codeforces Round 1096 (Div. 3)
Автор yse, 4 месяца назад, По-английски
Codeforces Round 1096 (Div. 3) Hello, Codeforces! ------------------ I am super excited to invite you to participate in [contest:2227], which will take place on [contest_time:2227]. You will be given $2$ hours and $30$ minutes to solve $8$ problems. All problems were authored and prepared by me. The round will be hosted by rules of educational rounds (extended ICPC). Thus, all solutions will be judged on preliminary tests during the round, and after the round, there will be a 12-hour phase of **open hacks**. After the open hack phase, all accepted solutions will be rejudged on successful hacks. Also, note that there is no score distribution but the usual penalty of **10 minutes** for each wrong submission, following the rules of educational rounds. [Remember](https://codeforces.me/blog/entry/59228) that only the trusted participants of the third division will be included in the official standings table. As it is written by link, this is a compulsory measure for combating unsporting behavior. To qualify as...
compulsory measure for combating unsporting behavior. To qualify as a _trusted participant of the third

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140.
Codeforces Round #744 (Div. 3)
Автор doreshnikov, история, 5 лет назад, По-русски
Codeforces Round #744 (Div. 3) Hello Codeforces! Sorry for a bit delayed English announcement, we are glad to invite you all to [contest:1579], third division round held on [contest_time:1579]. This round was prepared by me and [user:MikeMirzayanov,2021-09-26] and we hope that you'll find the problems interesting and enjoy solving them. I would like to thank [user:MikeMirzayanov,2021-09-26] for helping me with both writing and preparing the problems for this round. Since it's the second Div. 3 round held I'm involved in but only the first one I'm preparing problems for from zero all the way to the end, without his guidance it would've taken much more of my time. Also special thanks to [user:nizamoff,2021-09-28], [user:andreumat,2021-09-28], [user:QAZZY,2021-09-28], [user:Vladosiya,2021-09-28], [user:CtrlAlt,2021-09-28], [user:vladmart,2021-09-28], [user:Igorjan94,2021-09-28], [user:okwedook,2021-09-28], [user:I_Remember_Olya_ashmelev,2021-09-28] and [user:Aris_244_,2021-09-28] for testing the round and givi...
behavior. To qualify as trusted participants of the third division, you must:

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141.
Codeforces Round #790 (Div. 4)
Автор flamestorm, 4 года назад, По-английски
Codeforces Round #790 (Div. 4) Hello Codeforces! [user:SlavicG,2022-05-09], [user:mesanu,2022-05-09], [user:MikeMirzayanov,2022-05-09], [user:Errichto,2022-05-09], and I welcome you to [contest:1676]. It starts on [contest_time:1676]. The format of the event will be the same as before: - 5-8 tasks; - ICPC rules with a penalty of 10 minutes for an incorrect submission; - 12-hour phase of open hacks after the end of the round (hacks do not give additional points) - after the end of the open hacking phase, all solutions will be tested on the updated set of tests, and the ratings recalculated - by default, only "trusted" participants are shown in the results table (but the rating will be recalculated for all with initial ratings less than 1400 or you are an unrated participant/newcomer). We urge participants whose rating is 1400+ not to register new accounts for the purpose of narcissism but to take part unofficially. Please do not spoil the contest for the official participants. Only _trusted partic...
. This is a forced measure for combating unsporting behavior. To qualify as _a trusted participant

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142.
Codeforces Round #888 (Div. 3)
Автор Vladosiya, история, 3 года назад, По-русски
Codeforces Round #888 (Div. 3) Hello! [contest:1851] will start at [contest_time:1851]. You will be offered 6-8 problems with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have a rating of 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ICPC). Thus, solutions will be judged on preliminary tests during the round, and after the round, it will be a 12-hour phase of **open hacks**. You will be given **7 problems** and **2 hours and 15 minutes** to solve them. Note that the **penalty** for the wrong submission in this round is **10 minutes**. [Remember](https://codeforces.me/blog/entry/59228) that only the trusted participants of the third division will be included in the official standings table. As it is written by link, this is a compulsory measure for combating unsporting behavior. To qualify as a _trusted participant of the third...
compulsory measure for combating unsporting behavior. To qualify as a _trusted participant of the third

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143.
Indian ICPC Regionals 2019 Experience
Автор TheOneYouWant, история, 6 лет назад, По-английски
Indian ICPC Regionals 2019 Experience **Update: Part 2 can be found [here](https://thesestraythoughts.blogspot.com/2020/04/qualifying-for-icpc-world-finals-2020_23.html)!** Many thanks to [user:aryanc403,2020-04-23] for helping me with various things for both Part 1 and Part 2. I'd also like to thank [user:_Aaryan_,2020-04-23], [user:forgotter,2020-04-23], [user:smit_mandavia,2020-04-23] and [user:jeel_vaishnav,2020-04-23] for their useful comments while test-reading part 2! <spoiler summary="Spoilers from Part 1, build-up to Part 2"> After the ICPC online qualifications, we learn that we made both the regionals we opted for. As vowed at the end of Part-1, we practice more frequently with the aim of making World Finals, the eternal dream. The first regional we have is Kharagpur regionals &mdash; however, it is just the 2nd ICPC regionals of our lives, and we are nowhere near favorites to end up at the top. Will we rise to the challenge, or buckle under the pressure? </spoiler> x----------------------------------...

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144.
Codeforces Round #677 (Div. 3)
Автор vovuh, история, 6 лет назад, По-русски
Codeforces Round #677 (Div. 3) Hello! [contest:1433] will start at [contest_time:1433]. You will be offered 6 or 7 problems (or 8) with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have rating 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ACM-ICPC). Thus, during the round, solutions will be judged on preliminary tests, and after the round it will be a 12-hour phase of open hacks. I tried to make strong tests &mdash; just like you will be upset if many solutions fail after the contest is over. You will be given 6 or 7 (or 8) problems and 2 hours to solve them. Note that **the penalty** for the wrong submission in this round (and the following Div. 3 rounds) is **10 minutes**. [Remember] (/blog/entry/59228) that only the <i>trusted participants of the third division</i> will be included in the official standings table. As it is ...
for combating unsporting behavior. To qualify as a trusted participants of the third division

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145.
Codeforces Round #595 (Div. 3)
Автор vovuh, история, 7 лет назад, По-русски
Codeforces Round #595 (Div. 3) **UPD**: Thanks to Daria [user:ZeroAmbition,2019-10-22] Stepanova, Mikhail [user:PikMike,2019-10-22] Piklyaev and Artem [user:Rox,2019-10-22] Plotkin for help with round preparation! **UPD2**: [Editorial](https://codeforces.me/blog/entry/70779) is published! &lt;almost-copy-pasted-part&gt; Hello! [contest:1249] will start at [contest_time:1249]. You will be offered 6 or 7 problems (or 8) with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have rating 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ACM-ICPC). Thus, during the round, solutions will be judged on preliminary tests, and after the round it will be a 12-hour phase of open hacks. I tried to make strong tests &mdash; just like you will be upset if many solutions fail after the contest is over. You will be given 6 or 7 (or 8) problems and ...
for combating unsporting behavior. To qualify as a trusted participants of the third division

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146.
Teams qualified for ICPC Asia West Continent Championship 2024
Автор JagguBandar, история, 3 года назад, По-английски
Teams qualified for ICPC Asia West Continent Championship 2024 Currently, 77 teams are selected for the ICPC Asia West Continent Championship 2024. More teams are expected to come and will update the blog as required. Comment your team's Codeforces handle and I will add them to the list. **Update:** Added columns for team ratings. Credits: [user:blitztage,2024-03-12] [Official Standings](https://wc.indiaicpc.in/?page_id=92) Asia West Region ======================== | Team Name | Institute | Member 1 | Member 2 | Member 3 | Team Rating (Max.) | Team Rating (Curr.) | |----------------- ----------|--------------------------------|----------|----------|----------|----------|----------| |SkillIssue|Indian Institute of Technology – Delhi|[user:MridulAhi,2024-03-12]|[user:ElDiablo,2024-03-12]|[user:ghoul932,2024-03-12]|2723|2612| |DunderMifflin|Indian Institute of Technology – Kharagpur|[user:Dominater069,2024-03-12]|[user:rishit3234,2024-03-12]|[user:rishabh_agarwal,2024-03-12]|2671|2509| |DU__Ascendi...
Teams qualified for ICPC Asia West Continent Championship 2024

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147.
Codeforces Round #903 (Div. 3)
Автор Vladosiya, история, 3 года назад, По-русски
Codeforces Round #903 (Div. 3) Hello! [contest:1881] will start at [contest_time:1881]. You will be offered 6-8 problems with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have a rating of 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ICPC). Thus, solutions will be judged on preliminary tests during the round, and after the round, it will be a 12-hour phase of **open hacks**. You will be given **7 problems** and **2 hours and 15 minutes** to solve them. Note that the **penalty** for the wrong submission in this round is **10 minutes**. [Remember](https://codeforces.me/blog/entry/59228) that only the trusted participants of the third division will be included in the official standings table. As it is written by link, this is a compulsory measure for combating unsporting behavior. To qualify as a _trusted participant of the third...
compulsory measure for combating unsporting behavior. To qualify as a _trusted participant of the third

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148.
Blog formatting tips
Автор Tet, 6 лет назад, По-английски
Blog formatting tips Hi everyone! Since a ton of blogs are being posted everyday and let's say not all of them are worth reading ●︿● , I decided to write this blog so that we could agree on some proper formatting or at least get some advice from experienced users. <spoiler summary="this is aimed to be a discussion"> Well, of course as a person who is writing his second blog, I'm not qualified for writing this. </spoiler> Points that I find important while writing a blog ( not that my opinion matters anyway (¬_¬) ): * use: - A proper title (using ["I'm stuck on test 69!!!!"](https://codeforces.me/blog/entry/82183) won't get you anywhere) - Italics for Titles, Foreign Words, and Proper Names. ( _not just for making your text look better_ ) - Simple English ( maybe some users aren't as good as you are ) - Your brain to figure out if your text can be misinterpreted ( [this blog](https://codeforces.me/blog/entry/82177) is a good example ) - A fresh topic as m...
his second blog, I'm not qualified for writing this.

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149.
Codeforces Round 640 (Div. 4)
Автор MikeMirzayanov, история, 6 лет назад, По-английски
Codeforces Round 640 (Div. 4) _I almost copied my previous blog post to separate two discussions: about Div. 4 in general and about Round 640. Please, visit [this blog post](/blog/entry/77028) to discuss Div. 4 rounds._ Hello Codeforces! Yes, it is not a mistake I decided to run the first Div. 4 round: [contest:1352]! It starts on [contest_time:1352]. The format of the event will be identical to Div. 3 rounds: * 5-8 tasks; * ICPC rules with a penalty of 10 minutes for an incorrect submission; * 12-hour phase of open hacks after the end of the round (hacks do not give additional points) * after the end of the open hacking phase, all solutions will be tested on the updated set of tests and the ratings recalculated * by default, only "trusted" participants are shown in the results table (but the rating will be recalculated for all with initial ratings less than 1400 or you are unrated participant/newcomer). I urge participants whose rating is 1400+ not to register new accounts for the purpose of na...
table. This is a forced measure for combating with unsporting behavior. To qualify as a trusted

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150.
Teams going to ICPC WF 2023 (Egypt 2023, 2nd final) — WIP List
Автор FedeNQ, история, 3 года назад, По-английски
Teams going to ICPC WF 2023 (Egypt 2023, 2nd final) — WIP List Hi again! As we decided in [the other blog](https://codeforces.me/blog/entry/116946), let's have two differents lists, one per WF that will be held on Egypt. We'll fill this post with teams of **THE SECOND WF** in Egypt, assuming that those are the qualified from Regionals 2022/2023. Please add a comment with your team information and I will add it to the post. Info preferred: **{Handles on CF (otherwise, real name), Region, Country, University}** If you see some mistake on the teams, any kind of correction would be appreciated, also if you see here a team that belongs to the other post (or viceversa), let me know. </table> # Top 15 Over-All <table><thead><tr><th>Rank</th> <th>Country/Region</th><th>University</th> <th>Member1</th> <th>Member2</th> <th>Member3</th> <th>Rating</th></tr> </thead> <tr><td>1</td><td>Japan</td><td>&#129353; Tokyo Institute of Technology</td><td>[user:potato167,2024-05-01]</td><td>[user:tatyam,2024-05-01]</td><td>[user:noshi91,2024-05-...
qualified from Regionals 2022/2023.

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151.
Codeforces Round #627 (Div. 3)
Автор vovuh, история, 6 лет назад, По-русски
Codeforces Round #627 (Div. 3) **UPD: Pay attention to the changed start time of the competition.** &lt;almost-copy-pasted-part&gt; Hello! [contest:1324] will start at [contest_time:1324]. You will be offered 6 or 7 problems (or 8) with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have rating 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ACM-ICPC). Thus, during the round, solutions will be judged on preliminary tests, and after the round it will be a 12-hour phase of open hacks. I tried to make strong tests &mdash; just like you will be upset if many solutions fail after the contest is over. You will be given 6 or 7 (or 8) problems and 2 hours to solve them. Note that **the penalty** for the wrong submission in this round (and the following Div. 3 rounds) is **10 minutes**. [Remember] (/blog/entry/59228) that only the <i...
for combating unsporting behavior. To qualify as a trusted participants of the third division

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152.
Codeforces Round 1020 (Div. 3)
Автор SpyrosAliv, 17 месяцев назад, По-английски
Codeforces Round 1020 (Div. 3) <center> <h1> Hello, Codeforces! </h1> </center> [user:cry,2025-04-19] and I are _very very very_ excited to invite you to participate in [contest:2106], which will take place on [contest_time:2106]. You will be given **7 problems** and **2 hours & 15 minutes** to solve them. There will be **at least one** interactive problem, so please make sure to read [this guide](https://codeforces.me/blog/entry/45307) if you are not familiar with the format. One of the problems will be split into two subtasks. The round will be hosted by rules of educational rounds (extended ICPC). Thus, all solutions will be judged on preliminary tests during the round, and after the round, there will be a 12-hour phase of **open hacks**. After the open hack phase, all accepted solutions will be rejudged on successful hacks. Also, note that there is no score distribution but the usual penalty of **10 minutes** for each wrong submission, following the rules of educational rounds. [Remind](https://codef...
a compulsory measure for combating unsporting behavior. To qualify as a trusted participant of the

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153.
Teams Going to the 2024 ICPC North America Championship
Автор IanDeHaan, история, 3 года назад, По-английски
Teams Going to the 2024 ICPC North America Championship The list of teams qualified for the [2024 North America Championship](https://nac.icpc.global/) has been [posted here.](https://icpc.global/regionals/finder/North-America-Championship-2024/teams) So far, there are 48 teams there. I expect that 2 more will qualify and will update this post when they do. Please comment the codeforces handles of your university's team if you know them, and I'll add them to the list. :) Edit: There are now 50 teams. I expect that there won't be any more. Edit 2: nvm, boston shenanigans [East Central North America](https://naeast23.kattis.com/contests/naeast23/standings?filter=5332) ================== | University | Member 1 | Member 2 | Member 3 | |-------------------------------|----------|----------|----------| | University of Waterloo | [user:KevinWan,2024-03-01] | [user:uwu,2024-03-01] |[user:pwypeanut,2024-03-01] | | University of Michigan | [user:docriz,2024-04-21] | [u...
The list of teams qualified for the [2024 North America Championship](https://nac.icpc.global/) has

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154.
Codeforces Round 1084 (Div. 3)
Автор AksLolCoding, 6 месяцев назад, По-английски
Codeforces Round 1084 (Div. 3) Hello, Codeforces! ================== I am exhilarated to invite you to participate in [contest:2200], which will be held on [contest_time:2200]! You will be given $7$-$8$ problems to solve in $2$ hours and $15$ minutes. All problems were authored and prepared by me. The round will be hosted by rules of educational rounds (extended ICPC). During the round, all solutions will be judged on preliminary tests. After the round, there will be a 12-hour phase of open hacks. After the open hack phase, all accepted solutions will be rejudged on successful hacks. There will also be the usual penalty of 10 minutes for each wrong submission. [As a reminder](https://codeforces.me/blog/entry/59228), only trusted participants of the third division will be included in the official standings table. This is a compulsory measure for combating unsporting behavior. To qualify as a trusted participant of the third division, you must: - participate in at least five rated rounds (and solve at leas...
unsporting behavior. To qualify as a trusted participant of the third division, you must:

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155.
Live online mirror of The 2024 ICPC Asia Pacific Championship
Автор jonathanirvings, история, 3 года назад, По-английски
Live online mirror of The 2024 ICPC Asia Pacific Championship Hi, We would like to invite you to participate in the [live online mirror contest of The 2024 ICPC Asia Pacific Championship](https://codeforces.me/contests/1938) next weekend. ICPC Asia Pacific Championship is a new playoff round introduced to the Asia Pacific region this year. It is the contest for top non-winning teams from all regional contests in the region to qualify to the World Finals. See the [region rules](https://icpc.iisf.or.jp/asia-pacific/top/2023-24-cycle/) and [competition page](https://icpc.asia/) for more details. The official contest is scheduled to start at [Saturday, 2 March 2024, 9am (UTC+7)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=The+2024+ICPC+Asia+Pacific+Championship&iso=20240302T09&p1=95&ah=5). The live online mirror contest is scheduled to start [**only 5 minutes later**](https://www.timeanddate.com/worldclock/fixedtime.html?msg=The+2024+ICPC+Asia+Pacific+Championship+-+Online+Mirror&iso=20240302T0905&p1=95&ah=5), to keep both conte...
top non-winning teams from all regional contests in the region to qualify to the World Finals. See

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156.
CHelper manual
Автор Egor, 15 лет назад, По-русски
CHelper manual <div><div style="margin-top: 0.0px;margin-right: 0.0px;margin-bottom: 0.0px;margin-left: 0.0px;padding-top: 0.0px;padding-right: 0.0px;padding-bottom: 0.0px;padding-left: 0.0px;font-family: verdana , arial , sans-serif;font-size: 12.0px;line-height: 20.0px;background-color: rgb(255,255,255);"><b>1. Installation</b></div><div><span style="font-family: verdana , arial , sans-serif;font-size: 12.0px;line-height: 20.0px;background-color: rgb(255,255,255);">You need to download </span><a href="http://code.google.com/p/idea-chelper/downloads/detail?name=chelper2.4.jar" style="font-family: verdana , arial , sans-serif;font-size: 12.0px;line-height: 20.0px;background-color: rgb(255,255,255);color: rgb(0,0,204);">plug-in</a><span style="font-family: verdana , arial , sans-serif;font-size: 12.0px;line-height: 20.0px;background-color: rgb(255,255,255);"> and </span><a href="http://code.google.com/p/idea-chelper/downloads/detail?name=chelper.properties" style="font-family: verdana , arial , sans-s...
>inputClass - full qualified name of class used for input (like java.util.Scanner). This class, >outputClass - full qualified name of class used for output (like java.io.PrintWriter). Ouput class

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157.
Codeforces Round 966 (Div. 3)
Автор Vladosiya, история, 2 года назад, По-русски
Codeforces Round 966 (Div. 3) Hello! [contest:2000] will start at [contest_time:2000]. You will be offered 6-8 problems with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have a rating of 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ICPC). Thus, solutions will be judged on preliminary tests during the round, and after the round, it will be a 12-hour phase of **open hacks**. After open hacks all accepted solutions will be rejudged on successful hacks. You will be given **6-8 problems** and **2 hours and 15 minutes** to solve them. Note that the **penalty** for the wrong submission in this round is **10 minutes**. [Remember](https://codeforces.me/blog/entry/59228) that only the trusted participants of the third division will be included in the official standings table. As it is written by link, this is a compulsory measure for ...
compulsory measure for combating unsporting behavior. To qualify as a _trusted participant of the third

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158.
Codeforces Round 1062 (Div. 4)
Автор Muhammadali__, 11 месяцев назад, По-английски
Codeforces Round 1062 (Div. 4) Assalamu alaykum, Codeforces! ------------------ We are extremely excited to invite you to **first-ever-Uzbek** contest [contest: 2167], which starts on [contest_time:2167]. You will be given $7$ problems and $2$ hours and $15$ minutes to solve them. We hope you will find the problems interesting. The problems were authored by [user:khba,2025-10-14], [user:Muhammadali_2009, 2025-08-28], [user:JahonaliX,2025-08-25], [user:BehruzbekX,2025-10-14] and [user:Isamatdin,2025-10-14]. The format of the event will be identical to Div. 3 rounds: - ICPC rules with a penalty of 10 minutes for an incorrect submission; - 12-hour phase of open hacks after the end of the round (hacks do not give additional points) - after the end of the open hacking phase, all solutions will be tested on the updated set of tests, and the ratings recalculated - by default, only "trusted" participants are shown in the results table (but the rating will be recalculated for all with initial ratings less...
. This is a forced measure for combating unsporting behaviour. To qualify as _a trusted participant

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159.
How Japanese IOI team is selected
Автор EnumerativeCombinatorics, история, 9 лет назад, По-английски
How Japanese IOI team is selected I think this is the right time of showing the way of team selection in Japan, so I spare time for writing a blog, instead of preparing for Distributed Code Jam finals. Compared to other countries, Japanese selection rules are very simple. Perhaps this is the simplest rule among the countries getting gold medal almost every year. There are 3 rounds to go to IOI. Each round is **independent** so even if you don't do well in the previous round, you wouldn't have disadvantages for the next round (as long as you are qualified). 1. JOI Qualification Round (JOI 予選) ----------------------------------- The number of participants is a bit larger than 1,000. There are 6 tasks and contest duration is 3 hours. Judging from the past years' problems, the first task is really easy (like "I have 10 integers, and I'll give you 9 of my integers and the sum of all my integers. Can you guess the remaining integer?"), and about 5 students can solve the last task. This round is held online, and ...
before, you are automatically qualified to the Final Round. Otherwise, about 60 students with highest, previous round, you wouldn't have disadvantages for the next round (as long as you arequalified).

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160.
Codeforces Round 998 (Div. 3)
Автор Proof_by_QED, 20 месяцев назад, По-английски
Codeforces Round 998 (Div. 3) Hellowo Codeforces o7 ====================================== <div style="float:right; margin:0 1em 1em 1em; text-align:center;"> <img src="/predownloaded/04/74/0474addd27ccbb4c93f5c8390645861706d295de.png" style="width:400px;"/> </div> [user:cry,2025-01-12], [user:larush,2025-01-12], [user:chromate00,2025-01-12], [user:LMeyling,2025-01-12], [user:Lilypad,2025-01-12], and I are [ebullient](https://www.merriam-webster.com/dictionary/ebullient) to welcome you to participate in [contest:2060] at [contest_time:2060]. We have cooked up $7$ problems to be solved in $2$ hours and $30$ minutes. The round will be hosted by rules of educational rounds (extended ICPC). Thus, solutions will be judged on preliminary tests during the round, and after the round, it will be a 12-hour phase of **open hacks**. After open hacks all accepted solutions will be rejudged on successful hacks. Note that the **penalty** for each wrong submission in this round is **10 minutes**. Also, **not...
compulsory measure for combating unsporting behavior. To qualify as a _trusted participant of the third

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161.
Educational Codeforces Round 81 [Rated for Div. 2]
Автор awoo, история, 7 лет назад, По-русски
Educational Codeforces Round 81 [Rated for Div. 2] Hello Codeforces! On [contest_time:1295] [contest:1295] will start. Series of Educational Rounds continue being held as [Harbour.Space University](https://harbour.space/) initiative! You can read the details about the cooperation between [Harbour.Space University](https://harbour.space/) and Codeforces in the <a href="http://codeforces.me/blog/entry/51208">blog post</a>. This round will be **rated for the participants with rating lower than 2100**. It will be held on extended ICPC rules. The penalty for each incorrect submission until the submission with a full solution is 10 minutes. After the end of the contest you will have 12 hours to hack any solution you want. You will have access to copy any solution and test it locally. You will be given **6 problems** and **2 hours** to solve them. The problems were invented and prepared by Roman [user:Roms,2020-01-13] Glazov, Adilbek [user:adedalic,2020-01-13] Dalabaev, Vladimir [user:Vovuh,2020-01-13] Petrov, Ivan [user:Bl...
Moscow. If you and your team qualified for the Finals, fill out the form below to see if you’re

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162.
Codeforces Round #731 (Div. 3)
Автор DK318, 5 лет назад, По-русски
Codeforces Round #731 (Div. 3) Hello, Codeforces! We, [user:DK318,2021-07-09] and [user:unreal.eugene,2021-07-09], are students of ITMO University. And we have recently joined the developers team of Codeforces and Polygon. We have prepared this round for more careful acquaintance with Polygon. Very soon you will be able to see the first results of our work as developers. Except us, in round development participated [user:MikeMirzayanov,2021-07-09], [user:geranazavr555,2021-07-09] and [user:doreshnikov,2021-07-09]. We hope that you will enjoy the competition! [contest:1547] will start at [contest_time:1547]. You will be offered 7 problems with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have a rating 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ACM-ICPC). Thus, during the round, solutions will be judged on preliminary tests, a...
compulsory measure for combating unsporting behavior. To qualify as trusted participants of the third

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163.
Codeforces Round #674 (Div. 3)
Автор vovuh, история, 6 лет назад, перевод, По-русски
Codeforces Round #674 (Div. 3) **Notice the unusual start time**. Hello! [contest:1426] will start at [contest_time:1426]. You will be offered 6 or 7 problems (or 8) with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have rating 1600 or higher, can register for the round unofficially. This round consists mostly of the problems of the first stage of All-Russian Olympiad of School Students in Saratov and will be hosted during the real competition time. The problems were invented and prepared by Ivan [user:BledDest,2020-09-27] Androsov, Alexander [user:fcspartakm,2020-09-27] Frolov and me. The round will be hosted by rules of educational rounds (extended ACM-ICPC). Thus, during the round, solutions will be judged on preliminary tests, and after the round it will be a 12-hour phase of open hacks. I tried to make strong tests &mdash; just like you will be upset if many solutions fail after the contest is over...
for combating unsporting behavior. To qualify as a trusted participants of the third division

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164.
Codeforces Round 928 (Div. 4)
Автор flamestorm, 3 года назад, По-английски
Codeforces Round 928 (Div. 4) [user:mesanu,2024-02-18], [user:SlavicG,2024-02-18] and I are very excited to invite you to [contest:1926]! It starts on [contest_time:1926]. We would also like to give a very special thanks to the efforts of [user:MikeMirzayanov,2024-02-19] and [user:Vladosiya,2024-02-19], who helped significantly with the preparation of the round! The format of the event will be identical to Div. 3 rounds: - 5-8 tasks; - ICPC rules with a penalty of 10 minutes for an incorrect submission; - 12-hour phase of open hacks after the end of the round (hacks do not give additional points) - after the end of the open hacking phase, all solutions will be tested on the updated set of tests, and the ratings recalculated - by default, only "trusted" participants are shown in the results table (but the rating will be recalculated for all with initial ratings less than 1400 or you are an unrated participant/newcomer). We urge participants whose rating is 1400+ not to register new accounts for the purp...
. This is a forced measure for combating unsporting behavior. To qualify as _a trusted participant

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165.
Post-contest thoughts on The 2024 ICPC Asia Pacific Championship
Автор jonathanirvings, история, 3 года назад, По-английски
Post-contest thoughts on The 2024 ICPC Asia Pacific Championship The first edition of ICPC Asia Pacific Championship has just finished. Congratulation to team NewTrend from Seoul National University who won the contest with 9 problems solved. Also congratulation to all the top teams who will qualify to The 2024 ICPC World Finals in Kazakhstan. The full unfrozen result is available [here](https://icpcasia.firebaseapp.com/standings/). The task statements and analysis are available [in the contest website](https://icpc.asia/problem-set/). We will add more details on the page. Thank you for all official and mirror contest participants for participating! We hope you enjoy solving the tasks. See you in the next event. **The rest of this post reflects my personal thoughts** This contest is one of the most challenging CP project I have ever taken, on par with hosting IOI 2022. Being the person most responsible on judging the contest, the very first edition of such contest, hosted in a country I have never been in before, is a big responsibili...
solved. Also congratulation to all the top teams who will qualify to The 2024 ICPC World Finals in

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166.
Codeforces Round #544 (Div. 3)
Автор vovuh, история, 7 лет назад, перевод, По-русски
Codeforces Round #544 (Div. 3) &lt;copy-pasted-part&gt; Hello! [contest:1133] will start at [contest_time:1133]. You will be offered 6 or 7 problems (or 8) with expected difficulties to compose an interesting competition for participants with ratings up to 1600. Probably, participants from the first division will not be at all interested by this problems. And for 1600-1899 the problems will be too easy. However, all of you who wish to take part and have rating 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ACM-ICPC). Thus, during the round, solutions will be judged on preliminary tests, and after the round it will be a 12-hour phase of open hacks. I tried to make strong tests &mdash; just like you will be upset if many solutions fail after the contest is over. You will be given 6 or 7 (or 8) problems and 2 hours to solve them. Note that **the penalty** for the wrong submission in this round (and the following Div. 3 rounds) is *...
for combating unsporting behavior. To qualify as a trusted participants of the third division

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167.
VK Cup Round 2 + Codeforces Round 409 Announcement
Автор Lewin, 9 лет назад, перевод, По-русски
VK Cup Round 2 + Codeforces Round 409 Announcement Hello! The round 2 of VK Cup 2017 will take place on April 16 at 18:35 MSK (check your timezone [here](http://timeanddate.com/worldclock/fixedtime.html?day=16&month=4&year=2017&hour=18&min=35&sec=0&p1=166)), along with separate div1 and div2 Codeforces Round #409. The contest "VK Cup 2017 — Round 2" is for teams qualified from round 1. The top 100 teams will advance to the Round 3, while other ones will have one more chance in the Wild Card Round 2 later this month. Those who don't participate in the VK Cup can take part in the Codeforces Round #409 individually (problems will be available in English too). All three rounds last 2 hours, and all are rated. The round would not be possible without the following people (in no particular order): [user:KAN,2017-04-14], [user:Errichto,2017-04-14], [user:winger,2017-04-14], [user:AlexFetisov,2017-04-14], [user:LiChenKoh,2017-04-14], [user:xiaowuc1,2017-04-14], [user:MikeMirzayanov,2017-04-14]. Additionally, I thank VK company for sponso...
for teams qualified from round 1. The top 100 teams will advance to the Round 3, while other ones will

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168.
Codeforces Round #753 (Div. 3)
Автор doreshnikov, история, 5 лет назад, перевод, По-русски
Codeforces Round #753 (Div. 3) Hello Codeforces! Once again, we are glad to invite you all to [contest:1607], the third division round held on [contest_time:1607]. This round was prepared (again) by me and [user:MikeMirzayanov,2021-11-01]. The problems are different but our anticipation is the same :) Hope you will like the problems we've prepared! Big thanks to [user:MikeMirzayanov,2021-11-01] for great ideas as well as for helping me with writing good statements and better tests. I'm still a bit slow with some aspects of preparing problems so it's a really noticeable help for me. (UPD: as of this moment, it became much more noticeable, so, really, thanks a lot!) Also special thanks for testing the round to [user:01aglupal,2021-11-02], [user:From_ITK18_With_Love,2021-11-02], [user:Mazaalai,2021-11-02], [user:GusMG,2021-11-02], [user:nizamoff,2021-11-02], [user:2020akadaver,2021-11-02], [user:I_Remember_Olya_ashmelev,2021-11-02], [user:p0kemanbr,2021-11-02], [user:KoftaIQ,2021-11-02] and, as usual, to [user...
behavior. To qualify as trusted participants of the third division, you must:

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169.
Codeforces Round 954 (Div. 3)
Автор 74TrAkToR, история, 2 года назад, По-русски
Codeforces Round 954 (Div. 3) Hello! [contest:1986] will start at [contest_time:1986]. You will be offered 7 problems with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have a rating of 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ICPC). Thus, solutions will be judged on preliminary tests during the round, and after the round, it will be a 12-hour phase of **open hacks**. You will be given **7 problems** and **2 hours and 15 minutes** to solve them. Note that the **penalty** for the wrong submission in this round is **10 minutes**. [Remember](https://codeforces.me/blog/entry/59228) that only the trusted participants of the third division will be included in the official standings table. As it is written by link, this is a compulsory measure for combating unsporting behavior. To qualify as a _trusted participant of the third d...
compulsory measure for combating unsporting behavior. To qualify as a _trusted participant of the third

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170.
Codeforces Round #946 (Div. 3)
Автор Vladosiya, история, 2 года назад, По-русски
Codeforces Round #946 (Div. 3) Hello! [contest:1974] will start at [contest_time:1974]. You will be offered 6-8 problems with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have a rating of 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ICPC). Thus, solutions will be judged on preliminary tests during the round, and after the round, it will be a 12-hour phase of **open hacks**. You will be given **7 problems** and **2 hours and 15 minutes** to solve them. Note that the **penalty** for the wrong submission in this round is **10 minutes**. [Remember](https://codeforces.me/blog/entry/59228) that only the trusted participants of the third division will be included in the official standings table. As it is written by link, this is a compulsory measure for combating unsporting behavior. To qualify as a _trusted participant of the third...
compulsory measure for combating unsporting behavior. To qualify as a _trusted participant of the third

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171.
Codeforces Round 898 (Div. 4)
Автор mesanu, история, 3 года назад, По-английски
Codeforces Round 898 (Div. 4) Hello Codeforces! [user:flamestorm,2023-09-20], [user:MikeMirzayanov,2022-07-11] and I want to invite you to [contest: 1873]. It starts on [contest_time: 1873]. The format of the event will be identical to Div. 3 rounds: - 5-8 tasks; - ICPC rules with a penalty of 10 minutes for an incorrect submission; - 12-hour phase of open hacks after the end of the round (hacks do not give additional points) - after the end of the open hacking phase, all solutions will be tested on the updated set of tests, and the ratings recalculated - by default, only "trusted" participants are shown in the results table (but the rating will be recalculated for all with initial ratings less than 1400 or you are an unrated participant/newcomer). We urge participants whose rating is 1400+ not to register new accounts for the purpose of narcissism but to take part unofficially. Please do not spoil the contest for the official participants. Only _trusted participants of the fourth division_ wi...
. This is a forced measure for combating unsporting behaviour. To qualify as _a trusted participant

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172.
Meta Hacker Cup 2023 Round 1
Автор SecondThread, история, 3 года назад, По-английски
Meta Hacker Cup 2023 Round 1 Meta Hacker Cup Round 1 ================== Good morning! [Meta Hacker Cup Round 1](https://www.facebook.com/codingcompetitions/hacker-cup/2023/round-1) starts on [Saturday, October 7th at 10:00 AM Pacific](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Meta+Hacker+Cup+2023+Round+1&iso=20231007T10&p1=234&ah=3) in under 48 hours! Anyone can register for Round 1 this year, even if you haven't participated in the practice round. Important info: - To qualify for Round 2, you must solve at least one problem in this round. (Due to having too many submissions in the early part of the contest, we relaxed this requirement from the earlier one of needing to place in the top 5000 of the round) - The contest will be **3 hours**. - As usual, you may not discuss solution ideas or code until after the contest hours is over. It's your responsibility to make sure that your code is not leaked. We'll DQ contestants if we have reason to believe they shared code or solutions with oth...
Round 1. At most 50 contestants will get a bye; if more than 50 qualify, only the best 50 of them, who do not qualify for Round 2 cannot earn a prize. More prize details will be announced after Round 1.

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173.
Codeforces Round #294 (Div. 2)
Автор ADJA, 12 лет назад, По-русски
Codeforces Round #294 (Div. 2) Hello, Codeforces! My name is Adilet Zhaxybay, and together with Bekzhan Kassenov ([user:Bekzhan.Kassenov,2015-02-27]) we are authors of Codeforces #294, which will be held on [28th of February at 16:00 MSK](http://www.timeanddate.com/worldclock/fixedtime.html?day=28&month=2&year=2015&hour=16&min=0&sec=0&p1=166). This is our first Codeforces round and we are happy to invite all of you to participate in it. The round will be rated for the second division, however, participants from the first division can, as usually, participate in it unofficially. As far as we know, it is the first Codeforces round, which was completely prepared by the authors from Kazakhstan. We are very honored by this fact and hope that everything will go great. We are encouraging other participants from our country to join us — I am sure, that you can prepare a lot of very nice problems. Preparing Codeforces round is possible ;) We want to thank all the people, who helped us to prepare the contest: Max Akh...
, Astana. Our university participates in ACM-ICPC only from 2012, but the team from NU alreadyqualified

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174.
Codeforces Round #820 (Div. 3)
Автор Aris, история, 4 года назад, По-русски
Codeforces Round #820 (Div. 3) Hello! [contest:1729] will start at [contest_time:1729]. You will be offered 6-8 problems with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have a rating of 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ICPC). Thus, solutions will be judged on preliminary tests during the round, and after the round, it will be a 12-hour phase of **open hacks**. You will be given **6-8 problems** and **2 hours and 15 minutes** to solve them. One of the problems in this round is **interactive**. Don't forget to read the [guide on interactive problems](https://codeforces.me/blog/entry/45307). Note that the **penalty** for the wrong submission in this round is **10 minutes**. [Remember](https://codeforces.me/blog/entry/59228) that only the trusted participants of the third division will be included in the official s...
compulsory measure for combating unsporting behavior. To qualify as a _trusted participant of the third

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175.
Codeforces Round 1107 (Div. 3)
Автор wakanda-forever, 2 месяца назад, По-английски
Codeforces Round 1107 (Div. 3) #### Hello Codeforces!!! I am more than happy to invite you to my first solo round [Codeforces Round 1107 (Div. 3)](https://codeforces.me/contest/2241), which starts on [contest_time:2241]. You will be given $7$ problems and $2$ hours $15$ minutes to solve them. All the problems were authored and prepared by me. The round will be hosted by the rules of educational rounds (extended <b>ICPC</b>). Thus, all solutions will be judged on preliminary tests during the round, and after the round, there will be a <b>12-hour phase</b> of open hacks. After the open hack phase, all accepted solutions will be rejudged on successful hacks. Also, note that there is no score distribution — rank will be determined by the number of problems solved, followed by penalty; wrong submissions will incur the usual penalty of 10 minutes, following the rules of educational rounds. [Remember](https://codeforces.me/blog/entry/59228) that only the trusted participants of the third division will...
compulsory measure for combating unsporting behavior. To qualify as a trusted participant of the

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176.
Codeforces Round 944 (Div. 4)
Автор flamestorm, 2 года назад, По-английски
Codeforces Round 944 (Div. 4) Hi, Codeforces! [user:mesanu,2024-05-09], [user:SlavicG,2024-05-09] and I are very excited to invite you to [contest:1971]! It starts on [contest_time:1971]. &lt;begin-copy-pasted-part&gt; The format of the event will be identical to Div. 3 rounds: - 5-8 tasks; - ICPC rules with a penalty of 10 minutes for an incorrect submission; - 12-hour phase of open hacks after the end of the round (hacks do not give additional points) - after the end of the open hacking phase, all solutions will be tested on the updated set of tests, and the ratings recalculated - by default, only "trusted" participants are shown in the results table (but the rating will be recalculated for all with initial ratings less than 1400 or you are an unrated participant/newcomer). We urge participants whose rating is 1400+ not to register new accounts for the purpose of narcissism but to take part unofficially. Please do not spoil the contest for the official participants. Only _trusted participant...
. This is a forced measure for combating unsporting behavior. To qualify as _a trusted participant

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177.
Difficulties Faced in ICPC Colombia: Balancing National and International Competitions
Автор mcqueencin, история, 3 года назад, По-английски
Difficulties Faced in ICPC Colombia: Balancing National and International Competitions Hi Codeforces community! I am currently a member of a team that aspires to compete in the upcoming ICPC World Final 2024. As we gear up for this exciting journey, we encounter a significant hurdle that we'd like to share with you all. As part of the qualification process, we must first participate in the national marathon in Colombia, which is a crucial step towards earning a spot in the Latin American regional and, ultimately, the world finals. However, here's where the difficultie lies – the scheduled date for the national marathon (2nd September) coincides with the prestigious International Olympiad in Informatics (IOI), taking place from 28th August to 4th September. Several team members, including myself as a coach and one of my teammates as participant, have qualified to represent Colombia in Hungary at the IOI, making it seemingly impossible to be at both events simultaneously (as far as we know). Upon realizing this conflict, we immediately attempted to contact ICPC Co...
one of my teammates as participant, have qualified to represent Colombia in Hungary at the IOI

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178.
8th BSUIR Open Programming Championship
Автор aropan, 9 лет назад, По-русски
8th BSUIR Open Programming Championship <div style="text-align: center; margin-bottom: 10px;"> <img src="https://clist.by/static/img/banners/bsuir-open-2018-2.png"/> </div> The **8th BSUIR Open Programming Championship** will be held from February 16 till April 13, 2018 (Minsk, Belarus). [cut] Undergraduates and postgraduates of BSUIR, students of other educational institutions, students from other universities and countries are invited to participate in the Championship. The competition will take place in several rounds: - first qualifying round (distance, problems in Russian) — February 16-19; - second qualifying round (distance/onsite semi-final, russian and english problems) — February 21; - **Championship final for students teams (onsite, only english problems) — March 14-16**; - **Championship final for school teams (onsite) — April 11-13**. First qualifying round is required only for BSUIR and high school teams but other registered teams can also take part in it. **Second qualifying round is requi...

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179.
Codeforces Round #806 (Div. 4)
Автор mesanu, история, 4 года назад, По-английски
Codeforces Round #806 (Div. 4) Hello Codeforces! [user:SlavicG,2022-07-07], [user:flamestorm,2022-07-07], [user:MikeMirzayanov,2022-07-11] and I want to invite you to [contest:1703]. It starts on [contest_time:1703]. The format of the event will be identical to Div. 3 rounds: - 5-8 tasks; - ICPC rules with a penalty of 10 minutes for an incorrect submission; - 12-hour phase of open hacks after the end of the round (hacks do not give additional points) - after the end of the open hacking phase, all solutions will be tested on the updated set of tests, and the ratings recalculated - by default, only "trusted" participants are shown in the results table (but the rating will be recalculated for all with initial ratings less than 1400 or you are an unrated participant/newcomer). We urge participants whose rating is 1400+ not to register new accounts for the purpose of narcissism but to take part unofficially. Please do not spoil the contest for the official participants. Only _trusted participants o...
. This is a forced measure for combating unsporting behavior. To qualify as _a trusted participant

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180.
ICPC should NOT be done online
Автор jonathanirvings, история, 5 лет назад, По-английски
ICPC should NOT be done online I have been thinking about this for more than a year. I think it's time to share my thoughts. **Disclaimer: all opinions written in this post are purely personal and not tied with any affiliation/institution I am working with.** The [global pandemic we are encountering](https://en.wikipedia.org/wiki/COVID-19_pandemic) has affected many aspects of our life. While we need to adapt to doing most of our activities online, competing in the [International Collegiate Programming Contest (ICPC)](https://en.wikipedia.org/wiki/International_Collegiate_Programming_Contest) -- or similar high-stakes team programming contest -- should not be one of them. I have no objection to the following online contests: International Olympiad in Informatics (IOI), Google Code Jam (GCJ) final, Facebook Hacker Cup (FBHC) final, and any similar contest final which is participated by the best ~20 competitive programmers in the world. What makes them different from ICPC is the amount of trust we have put in th...

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181.
Codeforces Round #827 (Div. 4)
Автор SlavicG, 4 года назад, По-английски
Codeforces Round #827 (Div. 4) Hello Codeforces! [user:mesanu,2022-06-12], [user:flamestorm,2022-10-11], [user:MikeMirzayanov,2022-06-12] and I are glad to invite you to [contest:1742]! It starts on [contest_time:1742]. The format of the event will be identical to Div. 3 rounds: - 5-8 tasks; - ICPC rules with a penalty of 10 minutes for an incorrect submission; - 12-hour phase of open hacks after the end of the round (hacks do not give additional points) - after the end of the open hacking phase, all solutions will be tested on the updated set of tests, and the ratings recalculated - by default, only "trusted" participants are shown in the results table (but the rating will be recalculated for all with initial ratings less than 1400 or you are an unrated participant/newcomer). We urge participants whose rating is 1400+ not to register new accounts for the purpose of narcissism but to take part unofficially. Please do not spoil the contest for the official participants. Only _trusted participants o...
. This is a forced measure for combating unsporting behavior. To qualify as _a trusted participant

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182.
Why We Are Going To ACM-ICPC Finals?
Автор kalimm, история, 10 лет назад, По-английски
Why We Are Going To ACM-ICPC Finals? Hi Codeforces, Me([user:ErdemKirez,2016-12-01]), [user:muratakburak,2016-12-01] and [user:onuryildiz,2016-12-01] have a competitive programming team which name is LogicError in [TOBB ETU](https://en.wikipedia.org/wiki/TOBB_University_of_Economics_and_Technology). Like a month ago, we participated at SEERC 2016. When there's just a minute before the contest finished, I completed writing problem A and submitted it. It gave a wrong answer because in one line I wrote "a[i]" instead of "b[i]". I changed it immediately but I wasn't be able to submit it because contest had finished. I downloaded code to my flash drive, hoping that somebody add this problem to Gym in Codeforces. Thanks to [user:Temirulan,2016-12-01], he added SEERC 2016 to Gym, I submitted my code on Codeforces, and it passed. I got very sad because we got 6th place and lost 2th place because of one tiny bug, and chance of going ACM-ICPC Finals same time. Two days ago I got an e-mail from "ICPC Manager", which name...
far as I know, top 3 teams are qualified for finals. It made a big surprise for us and made us really

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183.
Codeforces Round 916 (Div. 3)
Автор awoo, история, 3 года назад, По-русски
Codeforces Round 916 (Div. 3) Hello, Codeforces! On [contest_time:1914] the [contest:1914] will start. You will be offered 6-8 problems with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have a rating of 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ICPC). Thus, during the round, solutions will be judged on preliminary tests, and after the round it will be a 12-hour phase of open hacks. You will be given **2 hours and 15 minutes** to solve **6-8 problems**. The penalty for a wrong submission is equal to **10 minutes**. [We remind you](https://codeforces.me/blog/entry/59228) that only _the trusted participants of the third division_ will be included in the official standings table. As it is written on the blog which you can access by this link, this is a compulsory measure for combating unsporting behavior. To qualify as _a tru...
qualify as _a trusted participant of the third division_, you must:

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184.
Codeforces Round 1054 (Div. 3)
Автор N29, 11 месяцев назад, перевод, По-русски
Codeforces Round 1054 (Div. 3) Hello, Codeforces! I am very excited to invite you to our contest [Codeforces Round 1054 (Div. 3)](https://codeforces.me/contest/2149), which starts on <a class="contest-time" contestid="2149" href="https://www.timeanddate.com/worldclock/fixedtime.html?day=25&month=9&year=2025&hour=17&min=35&sec=0&p1=166">. You will be given 7 problems and 2 hours and 15 minutes to solve them. The problems were authored by me and [user:__rose,2025-09-22] and [user:soullless,2025-09-23] to solve and alter them. The round will be hosted by the rules of educational rounds (extended **ICPC**). Thus, all solutions will be judged on preliminary tests during the round, and after the round, there will be a **12-hour phase** of open hacks. After the open hack phase, all accepted solutions will be rejudged on successful hacks. Also, note that there is no score distribution — rank will be determined by number of problems solved, followed by penalty; wrong submissions will incur the usual penalty of 10 m...
compulsory measure for combating unsporting behavior. To qualify as a trusted participant of the third

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185.
Codeforces Round #486 (Div. 3)
Автор vovuh, история, 8 лет назад, По-русски
Codeforces Round #486 (Div. 3) Hello! [contest:988] will start on [June 1 (Friday) at 14:35 (UTC)] (https://www.timeanddate.com/worldclock/fixedtime.html?day=1&month=6&year=2018&hour=17&min=35&sec=0&p1=166). It will be the third Div.3 round in the history of Codeforces. You will be offered 6 problems with expected difficulties to compose an interesting competition for participants with ratings up to 1600. Probably, participants from the first division will not be at all interested by this problems. And for 1600-1899 the problems will be too easy. However, all of you who wish to take part and have rating 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ACM-ICPC). Thus, during the round, solutions will be judged on preliminary tests, and after the round it will be a 12-hour phase of open hacks. I tried to make strong tests &mdash; just like you will be upset if many solutions fail after the contest is over. [Remember] (/blog/entry/59228...
for combating unsporting behavior. To qualify as a trusted participants of the third division

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186.
Teams for ACM ICPC World Finals 2015 — Marrakesh, Morocco
Автор ahmed_aly, 12 лет назад, По-английски
Teams for ACM ICPC World Finals 2015 — Marrakesh, Morocco I'm planning to make a scoreboard for the ACM ICPC World Finals 2015, the scoreboard will contain the TopCoder and Codeforces handles for the contestants. It will be similar to [this one](http://a2oj.com/ICPC.jsp) (but with some more improvements). Please post the Codeforces handles for the qualified teams here. I'll keep updating this post once I get any new information. Any suggestions for the scoreboard are welcome for sure. I'll add all the handles I get in the following table: | | Country | University | Contestant 1 | Contestant 2 | Contestant 3 | |:--:|:--:|:--:|:--:|:--:|:--:| | 1 | Russia | St. Petersburg National Research University of IT, Mechanics and Optics | [user:tourist,2015-05-19] | [user:qwerty787788,2015-05-19] | [user:VArtem,2015-05-19] | | 2 | Japan | The University of Tokyo | [user:rng_58,2015-05-19] | [user:semiexp,2015-05-19] | [user:wrong,2015-05-19] | | 3 | China | Shanghai Jiao Tong University | [user:AngryBacon,2015-05-19] | [user:rowdark,201...
Please post the Codeforces handles for the qualified teams here. I'll keep updating this post once

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187.
Codeforces Round 988 (Div. 3)
Автор cry, 22 месяца назад, По-английски
Codeforces Round 988 (Div. 3) Welcome to Natlan, Codeforces! ------------------ <div style="float:right; margin:0 1em 1em 1em; text-align:center;"> <img src="/predownloaded/b1/f4/b1f460f3b3dc0a21b417aece154d333df202f737.png" style="width:350px;"/> <div> <a href="https://genshin-impact.fandom.com/wiki/Toyac_Springs">Toyac Springs, Natlan</a> </div> </div> [user:sum,2024-10-25], [user:vgoofficial,2024-10-25] and I are [like a dog with two tails](https://dictionary.cambridge.org/us/dictionary/english/like-a-dog-with-two-tails) to welcome you to participate in [contest:2037] at [contest_time:2037]. We have cooked up $7$ problems to be solved in $2$ hours and $15$ minutes. The round will be hosted by rules of educational rounds (extended ICPC). Thus, solutions will be judged on preliminary tests during the round, and after the round, it will be a 12-hour phase of **open hacks**. After open hacks all accepted solutions will be rejudged on successful hacks. Note that the **penalty...
compulsory measure for combating unsporting behavior. To qualify as a _trusted participant of the third

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188.
Codeforces Round 937 (Div. 4)
Автор flamestorm, 2 года назад, По-английски
Codeforces Round 937 (Div. 4) Hej, Codeforces! [user:mesanu,2024-02-18], [user:SlavicG,2024-02-18] and I are very excited to invite you to [contest:1950]! It starts on [contest_time:1950]. The format of the event will be identical to Div. 3 rounds: - 5-8 tasks; - ICPC rules with a penalty of 10 minutes for an incorrect submission; - 12-hour phase of open hacks after the end of the round (hacks do not give additional points) - after the end of the open hacking phase, all solutions will be tested on the updated set of tests, and the ratings recalculated - by default, only "trusted" participants are shown in the results table (but the rating will be recalculated for all with initial ratings less than 1400 or you are an unrated participant/newcomer). We urge participants whose rating is 1400+ not to register new accounts for the purpose of narcissism but to take part unofficially. Please do not spoil the contest for the official participants. Only _trusted participants of the fourth division_ will be...
. This is a forced measure for combating unsporting behavior. To qualify as _a trusted participant

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189.
Codeforces Round #874 (Div. 3)
Автор Vladosiya, история, 3 года назад, По-русски
Codeforces Round #874 (Div. 3) Hello! [contest:1833] will start at [contest_time:1833]. You will be offered 6-8 problems with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have a rating of 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ICPC). Thus, solutions will be judged on preliminary tests during the round, and after the round, it will be a 12-hour phase of **open hacks**. You will be given **6-8 problems** and **2 hours and 15 minutes** to solve them. Note that the **penalty** for the wrong submission in this round is **10 minutes**. [Remember](https://codeforces.me/blog/entry/59228) that only the trusted participants of the third division will be included in the official standings table. As it is written by link, this is a compulsory measure for combating unsporting behavior. To qualify as a _trusted participant of the thi...
compulsory measure for combating unsporting behavior. To qualify as a _trusted participant of the third

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190.
Codeforces Round 950 (Div. 3)
Автор Vladosiya, история, 2 года назад, По-русски
Codeforces Round 950 (Div. 3) Hello! [contest:1980] will start at [contest_time:1980]. You will be offered 6-8 problems with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have a rating of 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ICPC). Thus, solutions will be judged on preliminary tests during the round, and after the round, it will be a 12-hour phase of **open hacks**. After open hacks all accepted solutions will be rejudged on successful hacks. You will be given **6-8 problems** and **2 hours and 15 minutes** to solve them. Note that the **penalty** for the wrong submission in this round is **10 minutes**. [Remember](https://codeforces.me/blog/entry/59228) that only the trusted participants of the third division will be included in the official standings table. As it is written by link, this is a compulsory measure for ...
compulsory measure for combating unsporting behavior. To qualify as a _trusted participant of the third

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191.
Teams going to the 2026 ICPC Asia Pacific Championship
Автор Kriz_Wu, 7 месяцев назад, По-английски
Teams going to the 2026 ICPC Asia Pacific Championship The 2026 ICPC Asia Pacific Championship will be held in Taoyuan, Taiwan, on March 8. For more information, please visit the [official website](https://apac26.icpc.tw). This post is based on the list of 70 qualified teams published [here](https://apac26.icpc.tw/championship/latest/teams/). If you know the Codeforces handles of any team that is not yet filled in, please let me know so I can add them. Additionally, here are some useful links: - **Livestream:** https://www.youtube.com/live/5x29584WxXg?si=PQ6-yýLTOE3Xp7c3 - **Online Mirror:** https://codeforces.me/blog/entry/151816 - **Live Standings:** https://icpcapac.firebaseapp.com/standings/ The on-site contest starts at **09:30 (UTC+8) on March 8, 2026**. Best of luck to all teams competing in the championship! ## Invited Teams <style type="text/css"> .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;font-size:14px...
of 70 qualified teams published [here](https://apac26.icpc.tw/championship/latest/teams/).

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192.
Codeforces Round 1027 (Div. 3)
Автор Vladosiya, история, 15 месяцев назад, По-русски
Codeforces Round 1027 (Div. 3) Hello! [contest:2114] will start at [contest_time:2114]. You will be offered 7 problems with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have a rating of 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ICPC). Thus, solutions will be judged on preliminary tests during the round, and after the round, it will be a 12-hour phase of **open hacks**. After open hacks all accepted solutions will be rejudged on successful hacks. You will be given **7 problems** and **2 hours and 15 minutes** to solve them. Note that the **penalty** for the wrong submission in this round is **10 minutes**. [Remember](https://codeforces.me/blog/entry/59228) that only the trusted participants of the third division will be included in the official standings table. As it is written by link, this is a compulsory measure for comb...
compulsory measure for combating unsporting behavior. To qualify as a _trusted participant of the third

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193.
A year since my start!
Автор Mousa_Aboubaker, история, 23 месяца назад, По-английски
A year since my start! as you can see in my profile, I have 365 days in a row in codeforces before a year, I started CP with a simple programming background I always wanted to start CP and learn DSA and how to implement them in problems, how to think better, how to be a good problem-solver! until the opportunity shined our national Olympiad (LOI) started in the previous year, as the first time since 10 years ago, and I find this opportunity is the best for me to start CP and learn DSA My beginning ------------------ We took a course before the LOI, and my first coach was [user:Hussien_Ibrahiem,2024-10-18], I'm really very proud to be one of his students, he taught the first step, and showed me the road, I learnt a lot of him, he was the one that made me to understand what is CP, and how beautiful is this world! He stayed with me along to way until the IOI, and I'm really happy that I met him in IOI, thank you coach on all your efforts <3 LOI Champion ------------------ After ...
and again, I got the first place and qualified to represent my country ^_^

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194.
Educational Codeforces Round 149 [Rated for Div. 2]
Автор awoo, история, 3 года назад, По-русски
Educational Codeforces Round 149 [Rated for Div. 2] Hello Codeforces! On [contest_time:1837] [contest:1837] will start. Series of Educational Rounds continue being held as [Harbour.Space University](https://harbour.space/) initiative! You can read the details about the cooperation between [Harbour.Space University](https://harbour.space/) and Codeforces in the <a href="http://mirror.codeforces.com/blog/entry/51208">blog post</a>. This round will be **rated for the participants with rating lower than 2100**. It will be held on extended ICPC rules. The penalty for each incorrect submission until the submission with a full solution is 10 minutes. After the end of the contest, you will have 12 hours to hack any solution you want. You will have access to copy any solution and test it locally. You will be given **6 or 7 problems** and **2 hours** to solve them. The problems were invented and prepared by Adilbek [user:adedalic,2023-05-24] Dalabaev, Ivan [user:BledDest,2023-05-24] Androsov, Maksim [user:Neon,2023-05-24] Mesche...
, fostering a culture of growth and innovation. Our students, who are qualified and talented, have

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195.
Codeforces Round #702 (Div. 3)
Автор Supermagzzz, 6 лет назад, По-русски
Codeforces Round #702 (Div. 3) Hello, Codeforces! \<almost-copy-pasted-part\> Hello! [Codeforces Round #702 (Div. 3)](https://codeforces.me/contest/1490) will start at [contest_time:1490]. You will be offered 7 problems with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have a rating 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ICPC). Thus, during the round, solutions will be judged on preliminary tests, and after the round it will be a 12-hour phase of open hacks. I tried to make strong tests — just like you will be upset if many solutions fail after the contest is over. You will be given 7 problems and 2 hours to solve them. Note that **the penalty** for the wrong submission in this round (and the following Div. 3 rounds) is **10 minutes**. [Remember](https://codeforces.me/blog/entry/59228) that only the trusted partici...
compulsory measure for combating unsporting behavior. To qualify as trusted participants of the third

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196.
Codeforces Round #855 (Div. 3)
Автор Vladosiya, история, 4 года назад, По-русски
Codeforces Round #855 (Div. 3) Hello! [contest:1800] will start at [contest_time:1800]. You will be offered 6-8 problems with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have a rating of 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ICPC). Thus, solutions will be judged on preliminary tests during the round, and after the round, it will be a 12-hour phase of **open hacks**. You will be given **6-8 problems** and **2 hours and 15 minutes** to solve them. Note that the **penalty** for the wrong submission in this round is **10 minutes**. [Remember](https://codeforces.me/blog/entry/59228) that only the trusted participants of the third division will be included in the official standings table. As it is written by link, this is a compulsory measure for combating unsporting behavior. To qualify as a _trusted participant of the thi...
compulsory measure for combating unsporting behavior. To qualify as a _trusted participant of the third

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197.
Codeforces Round #697 (Div. 3)
Автор Supermagzzz, 6 лет назад, По-русски
Codeforces Round #697 (Div. 3) Hello, Codeforces! Were you afraid of the lack of contests? We also! **Unfortunately, due to technical problems, the round is declared unrated. You can continue to solve problems, but the results of the current round will not affect your rating. We are sorry for this situation.** \<almost-copy-pasted-part\> Hello! [Codeforces Round #697 (Div. 3)](https://codeforces.me/contest/1475) will start at [contest_time:1475]. You will be offered 7 problems with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have a rating 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ICPC). Thus, during the round, solutions will be judged on preliminary tests, and after the round it will be a 12-hour phase of open hacks. I tried to make strong tests — just like you will be upset if many solutions fail after the contest is over....
compulsory measure for combating unsporting behavior. To qualify as trusted participants of the third

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198.
Codeforces Round #501 (Div. 3)
Автор vovuh, история, 8 лет назад, По-русски
Codeforces Round #501 (Div. 3) &lt;copy-pasted-part&gt; Hello! [contest:1015] will start at [contest_time:1015]. You will be offered 6 or 7 problems with expected difficulties to compose an interesting competition for participants with ratings up to 1600. Probably, participants from the first division will not be at all interested by this problems. And for 1600-1899 the problems will be too easy. However, all of you who wish to take part and have rating 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ACM-ICPC). Thus, during the round, solutions will be judged on preliminary tests, and after the round it will be a 12-hour phase of open hacks. I tried to make strong tests &mdash; just like you will be upset if many solutions fail after the contest is over. You will be given 6 or 7 problems and 2 hours to solve them. Note that **the penalty** for the wrong submission in this round (and the following Div. 3 rounds) is **10 minutes*...
for combating unsporting behavior. To qualify as a trusted participants of the third division

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199.
Codeforces Round #835 (Div. 4)
Автор SlavicG, 4 года назад, По-английски
Codeforces Round #835 (Div. 4) Hello Codeforces! [user:mesanu,2022-06-12], [user:flamestorm,2022-10-11], [user:MikeMirzayanov,2022-06-12] and I are glad to invite you to [contest:1760]! It starts on [contest_time:1760]. The format of the event will be identical to Div. 3 rounds: - 5-8 tasks; - ICPC rules with a penalty of 10 minutes for an incorrect submission; - 12-hour phase of open hacks after the end of the round (hacks do not give additional points) - after the end of the open hacking phase, all solutions will be tested on the updated set of tests, and the ratings recalculated - by default, only "trusted" participants are shown in the results table (but the rating will be recalculated for all with initial ratings less than 1400 or you are an unrated participant/newcomer). We urge participants whose rating is 1400+ not to register new accounts for the purpose of narcissism but to take part unofficially. Please do not spoil the contest for the official participants. Only _trusted participants o...
. This is a forced measure for combating unsporting behavior. To qualify as _a trusted participant

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200.
Google Code Jam Difficulty Estimation — 2021 Round 1A
Автор areo, история, 5 лет назад, По-английски
Google Code Jam Difficulty Estimation — 2021 Round 1A **td,dr**: A1 800, A2 1500, B1 1500, B2 1700, B3 2000, C1 1900, C2 2100, C3 3000. You needed around 2000 rating to have a 50% prob of advancing to round 2. Hi everyone. GCJ round 1A took place yesterday. If you didn't participate, you may be wondering how hard it was, and what are your chances to pass round 1B or 1C and qualify for round 2. I provide below my estimate of the difficulty of the problems. The data and methods are the same I described in my previous [post](https://codeforces.me/blog/entry/89276). I am sure there is room for improvement, so again I welcome any feedback. ### Method 1: The 50% Bucket #### Approach and Data Please see my previous [post](https://codeforces.me/blog/entry/89276) for an explanation. In short, I use the fact that you have a 50% probability to solve a problem with difficulty equal to your rating. I divide the contestants into buckets of rating, wide 100 points, and I check for which bucket 50% of the coders solved the p...
What rating did you need to be to pass the round? Well, 43% of coders rated 2000 qualified for

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201.
CHelper 3.9
Автор Egor, 14 лет назад, По-английски
CHelper 3.9 I would really appreciate any new ideas of what new features to add I would also appreciate [donations](https://money.yandex.ru/embed/shop.xml?account=410011732687384&quickpay=shop&payment-type-choice=on&writer=seller&targets=CHelper&targets-hint=&default-sum=100&button-text=03&successURL=) ----- 3.99 Kattis support for both Chrome and Contest parsers. You'd need to accept new permissions for Chrome extension. Good luck at ACM ICPC World Finals online contest! ----- 3.98 Codechef fix ----- 3.97 Fixed issue with template selection and Chrome plugin interaction ----- 3.96 Smallish update &mdash; you can now select task template per task. You can have several templates for general tasks, one where you need to output with Case #, GCJ where you need to integrate parallelization and similar ----- 3.95 Support for Idea 14.1+ Parsers for RCC and USACO fixed You can now parse other Codeforces contests when live contest is ongoing Sorry fo...
% — fully qualified name of input class (used in imports) %OutputClass% — short name of

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202.
Yandex.Algorithm 2011 Qualification 2
Автор NALP, 15 лет назад, По-русски
Yandex.Algorithm 2011 Qualification 2 <p class="MsoNormal">I'm glad to welcome all fans of programming!</p><p class="MsoNormal">The second qualifying round Yandex.Algorithm will take place today, and it was prepared for you by Artem Rakhov, Michael Mirzayanov and me.<br></p> <p class="MsoNormal">Please pay attention that as well as during the previous qualifying round Codeforces's functionality will be a little cut down for the period of the competition.&nbsp;Don't worry, all will return into place after the round termination.</p><p class="MsoNormal">I remind the best 500 participants pass in Yandex. Algorithm 2011 Round 1 which will take place on May, 20th at 19.00<br></p><p class="MsoNormal"></p><p class="MsoNormal">Good luck!<br></p><p class="MsoNormal"><span class="Apple-style-span" style="font-family: verdana, arial, sans-serif; line-height: 20px; "></span></p><div class="from-renderer" style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bot...

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203.
Codeforces Round 1114 (Div. 3)
Автор yse, 5 недель назад, По-английски
Codeforces Round 1114 (Div. 3) Hello, Codeforces! ------------------ I am very excited to invite you to participate in [contest:2254], which will take place on [contest_time:2254]. You will be given $2$ hours and $15$ minutes to solve $7$ problems, where one problem will be split into subtasks. All problems were authored and prepared by me. The round will be hosted by rules of educational rounds (extended ICPC). Thus, all solutions will be judged on preliminary tests during the round, and after the round, there will be a 12-hour phase of **open hacks**. After the open hack phase, all accepted solutions will be rejudged on successful hacks. Also, note that there is no score distribution but the usual penalty of **10 minutes** for each wrong submission, following the rules of educational rounds. [Remember](https://codeforces.me/blog/entry/59228) that only the trusted participants of the third division will be included in the official standings table. As it is written by link, this is a compulsory measure fo...
compulsory measure for combating unsporting behavior. To qualify as a _trusted participant of the third

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204.
Iranian Combinatorics Olympiad 2025
Автор aryanv, история, 11 месяцев назад, По-английски
Iranian Combinatorics Olympiad 2025 Hello everyone, The Iranian Combinatorics Olympiad is back! For those who are not familiar with this competition, this is an online event which is free to register and participate in. Everyone can participate in this challenge in a team of at most 3! Keep in mind that all members of a team must have the same nationality! The contest contains two rounds and students will be challenged to solve IMO style combinatorial questions. The unique and nice thing about this contest, is that it is the first contest in the world that has an online judging system for a theoretical exam. The registration is now open! Anyone in any grade and educational level can participate in this exam. There will be four divisions in this contest: 1) Junior Level: Students in grade 8 or below 2) Intermediate Level: Students in grade 10 or below 3) Advanced Level: Students in grade 12 or below 4) Open Level: No age restrictions As I mentioned above, this contest is completely fr...
**Teams qualified for the second day exam in the Advanced level**, **Teams qualified for the second day exam in the Open level**

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205.
Codeforces Round #780 (Div. 3)
Автор Aris, 4 года назад, перевод, По-русски
Codeforces Round #780 (Div. 3) Hello! [contest:1660] will start at [contest_time:1660]. You will be offered 6-8 problems with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have a rating of 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ICPC). Thus, solutions will be judged on preliminary tests during the round, and after the round, it will be a 12-hour phase of **open hacks**. You will be given **6-8 problems** and **2 hours and 15 minutes** to solve them. Note that the **penalty** for the wrong submission in this round is **10 minutes**. [Remember](https://codeforces.me/blog/entry/59228) that only the trusted participants of the third division will be included in the official standings table. As it is written by link, this is a compulsory measure for combating unsporting behavior. To qualify as a _trusted participant of the th...
compulsory measure for combating unsporting behavior. To qualify as a _trusted participant of the third

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206.
Codeforces Round #615 (Div. 3)
Автор vovuh, история, 7 лет назад, По-русски
Codeforces Round #615 (Div. 3) &lt;almost-copy-pasted-part&gt; Hello! [contest:1294] will start at [contest_time:1294]. You will be offered 6 or 7 problems (or 8) with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have rating 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ACM-ICPC). Thus, during the round, solutions will be judged on preliminary tests, and after the round it will be a 12-hour phase of open hacks. I tried to make strong tests &mdash; just like you will be upset if many solutions fail after the contest is over. You will be given 6 or 7 (or 8) problems and 2 hours to solve them. Note that **the penalty** for the wrong submission in this round (and the following Div. 3 rounds) is **10 minutes**. [Remember] (/blog/entry/59228) that only the <i>trusted participants of the third division</i> will be included in the ...
for combating unsporting behavior. To qualify as a trusted participants of the third division

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207.
Codeforces Round #811 (Div. 3)
Автор Vladosiya, история, 4 года назад, По-русски
Codeforces Round #811 (Div. 3) Hello! [contest:1714] will start at [contest_time:1714]. You will be offered 6-8 problems with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have a rating of 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ACM-ICPC). Thus, solutions will be judged on preliminary tests during the round, and after the round, it will be a 12-hour phase of open hacks. You will be given 6-8 problems and 2 hours and 15 minutes to solve them. Note that the penalty for the wrong submission in this round (and the following Div. 3 rounds) is 10 minutes. [Remember](https://codeforces.me/blog/entry/59228) that only the trusted participants of the third division will be included in the official standings table. As it is written by link, this is a compulsory measure for combating unsporting behavior. To qualify as a trusted parti...
compulsory measure for combating unsporting behavior. To qualify as a trusted participant of the third

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208.
Codeforces Round #776 (Div. 3)
Автор Vladosiya, история, 4 года назад, По-русски
Codeforces Round #776 (Div. 3) Hello! [contest:1650] will start at [contest_time:1650]. You will be offered 7-8 problems with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have a rating of 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ACM-ICPC). Thus, solutions will be judged on preliminary tests during the round, and after the round, it will be a 12-hour phase of open hacks. You will be given 7-8 problems and 2 hours and 15 minutes to solve them. Note that the penalty for the wrong submission in this round (and the following Div. 3 rounds) is 10 minutes. Remember that only the trusted participants of the third division will be included in the official standings table. As it is written by link, this is a compulsory measure for combating unsporting behavior. To qualify as a trusted participant of the third division, you must: ...
behavior. To qualify as a trusted participant of the third division, you must:

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209.
Codeforces Round #826 (Div. 3)
Автор Vladosiya, история, 4 года назад, По-русски
Codeforces Round #826 (Div. 3) Hello! [contest:1741] will start at [contest_time:1741]. You will be offered 6-8 problems with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have a rating of 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ICPC). Thus, solutions will be judged on preliminary tests during the round, and after the round, it will be a 12-hour phase of **open hacks**. You will be given **6-8 problems** and **2 hours and 15 minutes** to solve them. Note that the **penalty** for the wrong submission in this round is **10 minutes**. [Remember](https://codeforces.me/blog/entry/59228) that only the trusted participants of the third division will be included in the official standings table. As it is written by link, this is a compulsory measure for combating unsporting behavior. To qualify as a _trusted participant of the thi...
compulsory measure for combating unsporting behavior. To qualify as a _trusted participant of the third

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210.
Codeforces Round #867 (Div.3)
Автор diskoteka, 3 года назад, По-русски
Codeforces Round #867 (Div.3) Hello! [contest:1822] will start at [contest_time:1822]. You will be offered 6-8 problems with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have a rating of 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ICPC). Thus, solutions will be judged on preliminary tests during the round, and after the round, it will be a 12-hour phase of **open hacks**. You will be given **6-8 problems** and **2 hours and 15 minutes** to solve them. Note that the **penalty** for the wrong submission in this round is **10 minutes**. [Remember](https://codeforces.me/blog/entry/59228) that only the trusted participants of the third division will be included in the official standings table. As it is written by link, this is a compulsory measure for combating unsporting behavior. To qualify as a _trusted participant of the thi...
compulsory measure for combating unsporting behavior. To qualify as a _trusted participant of the third

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211.
Codeforces Round #527 (Div. 3)
Автор vovuh, история, 8 лет назад, перевод, По-русски
Codeforces Round #527 (Div. 3) I'm in the middle of the session but I'm still trying to prepare Div. 3 rounds. &lt;copy-pasted-part&gt; Hello! [contest:1092] will start at [contest_time:1092]. You will be offered 6 or 7 problems with expected difficulties to compose an interesting competition for participants with ratings up to 1600. Probably, participants from the first division will not be at all interested by this problems. And for 1600-1899 the problems will be too easy. However, all of you who wish to take part and have rating 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ACM-ICPC). Thus, during the round, solutions will be judged on preliminary tests, and after the round it will be a 12-hour phase of open hacks. I tried to make strong tests &mdash; just like you will be upset if many solutions fail after the contest is over. You will be given 6 or 7 problems and 2 hours to solve them. Note that **the penalty** for th...
for combating unsporting behavior. To qualify as a trusted participants of the third division

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212.
Codeforces Round #847 (Div. 3)
Автор Vladosiya, история, 4 года назад, По-русски
Codeforces Round #847 (Div. 3) Hello! [contest:1790] will start at [contest_time:1790]. You will be offered 6-8 problems with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have a rating of 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ICPC). Thus, solutions will be judged on preliminary tests during the round, and after the round, it will be a 12-hour phase of **open hacks**. You will be given **6-8 problems** and **2 hours and 15 minutes** to solve them. Note that the **penalty** for the wrong submission in this round is **10 minutes**. [Remember](https://codeforces.me/blog/entry/59228) that only the trusted participants of the third division will be included in the official standings table. As it is written by link, this is a compulsory measure for combating unsporting behavior. To qualify as a _trusted participant of the thi...
compulsory measure for combating unsporting behavior. To qualify as a _trusted participant of the third

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213.
Codeforces Round #817 (Div. 4)
Автор mesanu, 4 года назад, По-английски
Codeforces Round #817 (Div. 4) Hello Codeforces! [user:flamestorm,2022-08-28], [user:MikeMirzayanov,2022-07-11] and I want to invite you to [contest:1722]. It starts on [contest_time:1722]. The format of the event will be identical to Div. 3 rounds: - 5-8 tasks; - ICPC rules with a penalty of 10 minutes for an incorrect submission; - 12-hour phase of open hacks after the end of the round (hacks do not give additional points) - after the end of the open hacking phase, all solutions will be tested on the updated set of tests, and the ratings recalculated - by default, only "trusted" participants are shown in the results table (but the rating will be recalculated for all with initial ratings less than 1400 or you are an unrated participant/newcomer). We urge participants whose rating is 1400+ not to register new accounts for the purpose of narcissism but to take part unofficially. Please do not spoil the contest for the official participants. Only _trusted participants of the fourth division_ will...
. This is a forced measure for combating unsporting behaviour. To qualify as _a trusted participant

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214.
Help Greek IOI Team Raise Money to Participate On-site in IOI 2022
Автор oleh1421, история, 4 года назад, По-английски
Help Greek IOI Team Raise Money to Participate On-site in IOI 2022 **TL;DR** The Greek National Informatics team is holding a crowdfunding campaign to become able to participate on-site in IOI 2022 in Indonesia [Click here to donate](https://gogetfunding.com/help-greek-ioi-team-raise-money-to-participate-on-site-in-ioi-2022/) Hello dear Codeforces community, My name is Oleh Naver and I am from Ukraine. Last month my friend posted a blog on Codeforces about a fundraising campaign for hosting the Ukrainian selections for IOI. First of all, thank you all so much for donating, we are so grateful that we were finally able to host them. Now my dear friends from Greece who have qualified for IOI and helped in our crowdfunding are facing an economical issue. Apparently because the spread of the coronavirus has affected the financial state of businesses and national economies, they can't find sponsors to cover the expenses for them to travel on-site to Indonesia. Let me highlight the importance of participating in on-site Olympiads ins...
friends from Greece who have qualified for IOI and helped in our crowdfunding are facing an economical

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215.
Codeforces Round #565 (Div. 3)
Автор vovuh, история, 7 лет назад, По-русски
Codeforces Round #565 (Div. 3) &lt;almost-copy-pasted-part&gt; Hello! [contest:1176] will start at [contest_time:1176]. You will be offered 6 or 7 problems (or 8) with expected difficulties to compose an interesting competition for participants with ratings up to 1600. Probably, participants from the first division will not be at all interested by this problems. And for 1600-1899 the problems will be too easy. However, all of you who wish to take part and have rating 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ACM-ICPC). Thus, during the round, solutions will be judged on preliminary tests, and after the round it will be a 12-hour phase of open hacks. I tried to make strong tests &mdash; just like you will be upset if many solutions fail after the contest is over. You will be given 6 or 7 (or 8) problems and 2 hours to solve them. Note that **the penalty** for the wrong submission in this round (and the following Div. 3 round...
for combating unsporting behavior. To qualify as a trusted participants of the third division

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216.
From Argentina to the ICPC WF: the story of three friends that made their dream come true
Автор marianoferesin, 18 месяцев назад, По-английски
From Argentina to the ICPC WF: the story of three friends that made their dream come true Let me tell you the story of how some random guys from Argentina one day took a plane (many actually) and went to Kazakhstan to compete the most prestigious programming contest in the world. Everything started in 2019 when one day the ones that were going to end up being our coaches did a talk about how they got to travel to Portugal because they participated in a programming contest (something I have never heard before). But that day, that day... something inside me told me I was going to do the same. Some years passed training basically by myself until one day I received a message from Fede, inviting me to join their team. A team that then would be named "Fruta Fresca" (Fresh Fruit), months passed, problems passed, training camps passed. Until one day arrived our first regional competition as a team. Not our best day, but some brilliance from JP on the problem that gave us hope and put us on the verge of qualification. Without knowing it would not be the last time Fruta Fresca ...
After some hours and some post-contest beers we got the news that we were qualified to Mexico to

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217.
Codeforces Round #498 (Div. 3)
Автор vovuh, история, 8 лет назад, По-русски
Codeforces Round #498 (Div. 3) Hello! Finally I am freed from the big part of summer cares and I can continue the preparation of Div. 3 rounds! I decided to add something written by me to this blog because [user:TryToKnowMe,2018-07-15] (and many others, i think) [noticed](https://codeforces.me/blog/entry/60377?#comment-442051) that i am really copy and paste this text from one announcement to another changing only contest name and start time. But... Who knows, may be this time which is saved by copy-pasting the announcement allows me to prepare the problems better?... Let it stay a mystery. So, let's go. [contest:1006] will start at [contest_time:1006]. You will be offered 6 problems with expected difficulties to compose an interesting competition for participants with ratings up to 1600. Probably, participants from the first division will not be at all interested by this problems. And for 1600-1899 the problems will be too easy. However, all of you who wish to take part and have rating 1600 or higher, can re...
for combating unsporting behavior. To qualify as a trusted participants of the third division

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218.
Codeforces Round #289 (Div. 2) + qualifying round for the WCC
Автор map, 12 лет назад, По-русски
Codeforces Round #289 (Div. 2) + qualifying round for the WCC Hello, Codeforces! I'd like to invite you to Codeforces Round #289 (Div. 2). It'll be held on [Saturday, January 31 at 15:00 MSK](http://www.timeanddate.com/worldclock/fixedtime.html?iso=20150131T15&p1=166) and as usual Div. 1 participants can take part out of competition. This round will be carried out according to the ACM rules, which means that you get verdict of your solution on-line, and the duration time is 3 hours. These differences in the rules are caused by the fact that **this round is the second qualifying round for the [WCC](http://codeforces.me/blog/entry/15739)**, which stands for Winter Computer Camp and can be also mentioned as ZKSH. Official school website &mdash; [hhttp://it-edu.mipt.ru/en/zksh2015](http://it-edu.mipt.ru/en/zksh2015). [There](http://it-edu.mipt.ru/sites/default/files/rules_otbor.pdf) you can find the selection rules for WCC. If you are a school student and you want to participate in the selection to WCC here are the steps: 1. Sign up for...

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219.
Codeforces Round 970 (Div. 3)
Автор Pa_sha, история, 2 года назад, По-английски
Codeforces Round 970 (Div. 3) Hello Codeforces! I am pleased to invite you all to participate in [Codeforces Round 970 (Div. 3)](https://codeforces.me/contests/2008), which will start on [contest_time:2008]. The format of the event will be like any Div. 3 rounds: - 6-8 tasks; - ICPC rules with a penalty of 10 minutes for an incorrect submission; - 12-hour phase of **open hacks** after the end of the round (hacks do not give additional points) - after the end of the open hacking phase, all solutions will be tested on the updated set of tests, and the ratings recalculated - by default, only "trusted" participants are shown in the results table. I encourage participants with a rating of 1600+ not to create new accounts but to participate unofficially. Only [trusted participants](https://codeforces.me/blog/entry/59228) of the third division will be included in the official standings table. This is a forced measure for combating unsporting behavior. To qualify as a _trusted participant_ of t...
. To qualify as a _trusted participant_ of the third division, you must:

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220.
Codeforces Round #725 (Div. 3)
Автор Stepavly, 5 лет назад, По-русски
Codeforces Round #725 (Div. 3) Hello, Codeforces! UPD: Since the round seems a little more complicated than usual after testing, we extended the round length by 15 minutes. \<almost-copy-pasted-part\> Hello! [Codeforces Round #725 (Div. 3)](https://codeforces.me/contest/1538) will start at [contest_time:1538]. You will be offered 7 problems with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have a rating 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ICPC). Thus, during the round, solutions will be judged on preliminary tests, and after the round, it will be a 12-hour phase of open hacks. I tried to make strong tests — just like you will be upset if many solutions fail after the contest is over. You will be given 7 problems and 2 hours to solve them. Note that **the penalty** for the wrong submission in this round (and the f...
compulsory measure for combating unsporting behavior. To qualify as trusted participants of the third

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221.
2024 Latin American Championship Teams
Автор Platanito_Frito, история, 3 года назад, По-английски
2024 Latin American Championship Teams On *October 21*, the regional competitions were held to determine the teams that will participate in **The 2024 ICPC Latin America Championship**. *404 teams* participated and *357 of them* solved at least one task. [Here](https://scorelatam.naquadah.com.br/latam-2023/) you can see the official standings. According to the qualification rules, **20 slots** should be allocated to the best-performing teams from all Latin America, with a general rule of at most **2 teams from the same institution**. The rest of the qualifiers will be chosen according to the algorithm established [here](https://drive.google.com/file/d/186s5Od43Dok_g5ILZYwPXEhstmmIlKoX/view). **UPD1: There will be a total of 42 spots!!** In addition to the initially considered 40 spots, the ICPC LATAM Steering Committee has approved 2 additional spots for the best all-female team in all of LATAM and for the best team from the host region **UPD2:** The [list](https://icpc.global/regionals/finder/Latin-America-Cha...
Qualified Teams to Latin America Championship (official)

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222.
Editorial for Codeforces Round #346 (Div. 2)
Автор IlyaLos, история, 10 лет назад, По-русски
Editorial for Codeforces Round #346 (Div. 2) [659A &mdash; Round House](http://codeforces.me/contest/659/problem/A) The answer for the problem is calculated with a formula $((a - 1 + b)$ $\mod$ $n$ + $n$) $\mod$ $n$ + $1$. Such solution has complexity $O(1)$. There is also a solution with iterations, modelling every of $|b|$'s Vasya's moves by one entrance one by one in desired direction, allowed to pass all the tests. This solution's complexity is $O(|b|)$. [659B &mdash; Qualifying Contest](http://codeforces.me/contest/659/problem/B) Let's consider the participants from every region separately. So for every region we just need to sort all of its participants by their score in non-increasing order. The answer for a region is inconsistent if and only if the score of the second and the third participant in this order are equal, otherwise the answer is the first and the second participant in this order. The solution complexity is $O(n \log{n})$. [659C &mdash; Tanya and Toys](http://codeforces.me/contest/65...

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Разбор задач Codeforces Round 346 (Div. 2)
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223.
Codeforces Round 891 (Div. 3)
Автор Pa_sha, 3 года назад, По-английски
Codeforces Round 891 (Div. 3) Hello Codeforces! We are pleased to invite you all to participate in [Codeforces Round 891 (Div. 3)](https://codeforces.me/contests/1857), which will start on [contest_time:1857]. The format of the event will be like any Div. 3 rounds: - 6-8 tasks; - ICPC rules with a penalty of 10 minutes for an incorrect submission; - 12-hour phase of **open hacks** after the end of the round (hacks do not give additional points) - after the end of the open hacking phase, all solutions will be tested on the updated set of tests, and the ratings recalculated - by default, only "trusted" participants are shown in the results table. We encourage participants with a rating of 1600+ not to create new accounts but to participate unofficially. Only [trusted participants](https://codeforces.me/blog/entry/59228) of the third division will be included in the official standings table. This is a forced measure for combating unsporting behavior. To qualify as a _trusted participant_ o...
. To qualify as a _trusted participant_ of the third division, you must:

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224.
Codeforces Round #560 (Div. 3)
Автор vovuh, история, 7 лет назад, перевод, По-русски
Codeforces Round #560 (Div. 3) I have nothing to say this time, so meet yet another Div. 3 round :) &lt;almost-copy-pasted-part&gt; Hello! [contest:1165] will start at [contest_time:1165]. You will be offered 6 or 7 problems (or 8) with expected difficulties to compose an interesting competition for participants with ratings up to 1600. Probably, participants from the first division will not be at all interested by this problems. And for 1600-1899 the problems will be too easy. However, all of you who wish to take part and have rating 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ACM-ICPC). Thus, during the round, solutions will be judged on preliminary tests, and after the round it will be a 12-hour phase of open hacks. I tried to make strong tests &mdash; just like you will be upset if many solutions fail after the contest is over. You will be given 6 or 7 (or 8) problems and 2 hours to solve them. Note that **the penalty*...
for combating unsporting behavior. To qualify as a trusted participants of the third division

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225.
Codeforces Round 1072 (Div. 3)
Автор Kogut_Ivan, 8 месяцев назад, По-русски
Codeforces Round 1072 (Div. 3) Hello, Codeforces! ------------------- The TG channel team @KogutIvanTutoring is pleased to invite you to participate in the first Div. 3 round of this year &mdash; [contest:2184] on [contest_time:2184]. This round will feature 6-7 problems selected in difficulty to create an interesting competition for participants with ratings up to 1600. However, anyone with a rating of 1600 or higher can register for the round out of competition. The round will follow the rules of educational rounds. Thus, during the round, the problems will be tested on preliminary tests, and after the round, there will be a 12-hour phase of **open hacking**. After this phase, all successful attempts will be retested on successful hacks. We have tried to create decent tests &mdash; just like you, we will be disappointed if many solutions fail after the contest ends. You will be offered **6-7 problems** and **2 hours 15 minutes** to solve them. The **penalty** for an incorrect attempt in this round wil...
necessary measure to combat unsportsmanlike behavior. To qualify as a _reliable participant of the

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226.
Invitation to XI BSUIR Open Programming Championship
Автор wilcot, история, 3 года назад, По-английски
Invitation to XI BSUIR Open Programming Championship The **XI BSUIR Open Programming Championship** will be held from March 15 till April 29, 2023 (Minsk, Belarus). ![ ](/predownloaded/61/30/613055c0e2a020ace760d19c972c76e0e12e4d1f.png) Undergraduates and postgraduates of BSUIR, scholars, students from other universities and countries are invited to participate in the Championship. The competition will take place in several rounds: - Quarterfinals (distance, problems in Russian and English) — **March 15 — March 20** (both included); - Semifinals (distance/onsite semi-final, russian and english problems) — **April 6**; - Students Final &mdash; **April 22** (Belarusian State University of Informatics and Radioelectronics, Minsk); - Schools Final &mdash; **April 29** (Belarusian State University of Informatics and Radioelectronics, Minsk). Quarterfinals are required only for BSUIR and school teams but other registered teams can also take part in it. **Semifinals are required for all teams.** BSUIR and school teams from Bel...

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227.
Team preview: Lviv National University
Автор Egor, 11 лет назад, По-английски
Team preview: Lviv National University ![image](https://41.media.tumblr.com/015ed52b2a3938a47609cb53e5d51e13/tumblr_inline_nochyySchX1rdhd0n_540.png) Hello, this is Egor. Today we are starting previewing some teams from ACM ICPC World Finals in Marrakech that, by my opinion, have most chances to win gold medals. First to go is Lviv National University team LNU Penguins. Some trivia: Lviv NU participated just 2 times, but got gold one of those times, in 2008. One of participants of that team, Vasyl Biletsky, is current team's coach (but we should note that he actually was his own team's coach in 2008 as well). This year team qualified to World Finals as winners of SEERC. They are currently 11th in OpenCup standings (do note, however, that there are many teams in that standing that are not ICPC eligible for one reason or another). Roman Bilyi (TC: 2513, CF: 2672) participated in Russian Code Cup Finals in 2014 and won Bronze in Snarknews Winter Series 2015 Vitaliy Herasymiv (TC: 2206, CF: 2356) won Silver in IO...
This year team qualified to World Finals as winners of SEERC. They are currently 11th in OpenCup

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228.
Codeforces Round #555 (Div. 3)
Автор vovuh, история, 7 лет назад, По-русски
Codeforces Round #555 (Div. 3) Suddenly, this round will consist of 7 different problems also! **UPD2**: The round will consist of 7 problems and one of them will be in easy and hard editions! &lt;almost-copy-pasted-part&gt; Hello! [contest:1157] will start at [contest_time:1157]. You will be offered 6 or 7 problems (or 8) with expected difficulties to compose an interesting competition for participants with ratings up to 1600. Probably, participants from the first division will not be at all interested by this problems. And for 1600-1899 the problems will be too easy. However, all of you who wish to take part and have rating 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ACM-ICPC). Thus, during the round, solutions will be judged on preliminary tests, and after the round it will be a 12-hour phase of open hacks. I tried to make strong tests &mdash; just like you will be upset if many solutions fail after the contest is over. ...
for combating unsporting behavior. To qualify as a trusted participants of the third division

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229.
VNOI Cup 2022 Round 2 [Mirror invitation]
Автор darkkcyan, история, 4 года назад, По-английски
VNOI Cup 2022 Round 2 [Mirror invitation] Hello again Codeforces! <!-- Short sentence for invitation --> We are glad to invite you to take part in mirror round of [the second round of VNOI Cup](https://oj.vnoi.info/contest/vnoicup22_r2_mirror), which will take place [at 13:00 UTC, on this Saturday, 25th June](https://www.timeanddate.com/worldclock/fixedtime.html?msg=%5BMirror%5D%20VNOI%20Cup%202022%20-%20Round%202&iso=2022-06-25T13:00:00), and it is hosted on our builtin platform &mdash; [VNOJ](https://oj.vnoi.info/)! <center> <img src="/predownloaded/0c/04/0c04e729c4ba111d2f61cd6aaabd649b844d1887.png" alt="round2-poster" /> </center> <!-- Ask qualified participants to take part in the official round --> **If you are Vietnamese and _qualified_ according to these rules mentioned on [this post](https://cup.vnoi.info/rule/)**, please consider taking part in [the official round](https://oj.vnoi.info/contest/vnoicup22_r2)! <!-- Introduce VNOI --> VNOI Cup is a Competitive Programming competition held by VNOI (Viet...
**If you are Vietnamese and

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230.
6th BSUIR Open Programming Contest
Автор aropan, история, 10 лет назад, По-русски
6th BSUIR Open Programming Contest <div style="text-align: center; margin-bottom: 10px;"> <img src="http://acm.bsuir.by/wps/wcm/connect/49a3cc004bf1a0e88ccdae0a71540aef/1/_header_article.png?MOD=AJPERES&CACHEID=49a3cc004bf1a0e88ccdae0a71540aef/1"/> </div> The 6th BSUIR Open Programming Championship will be held from March 26 till April 28, 2016 (Minsk, Belarus). Undergraduates and postgraduates of BSUIR, students of other educational institutions, students from other universities and CIS countries are invited to participate in the Championship. The competition will take place in three rounds: - first qualifying round (distance, problems in russian) — March 26-29; - second qualifying round (distance/onsite semi-final, russian and english problems) — April 5; - Championship final (onsite, only english problems) — April 26-28. First qualifying round is required only for BSUIR and high school teams but other registered teams can also take part in it. **Second qualifying round is required for all teams**; BS...

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231.
ACM ICPC Practice Contest invitation — easy prizes!
Автор I_love_Tanya_Romanova, 11 лет назад, По-английски
ACM ICPC Practice Contest invitation — easy prizes! Hello everyone! I want to invite you to another contest at [HackerEarth](https://www.hackerearth.com/), and this time it is not Clash :) But [ACM ICPC Practice Contest](https://www.hackerearth.com/acm-icpc-practice-contest/). Contest is scheduled on [October, 4](http://www.timeanddate.com/worldclock/fixedtime.html?msg=%20ACM%20ICPC%20Practice%20Contest&iso=2015-10-04T10:30:00&p1=64). You'll face ICPC-style problemset with quite a lot of problems) Contest is focused on ICPC preparation, so are the rules &mdash; it will be **5h long team event with ICPC scoring rules** (only full solutions count, ranking by number of problems and then by penalty time, giving penalty for wrong submissions), and only C/C++/Java in list of allowed languages. Problemset was prepared for you by [user:FatalEagle,2015-10-03], [user:memset123,2015-10-04], [user:pkacprzak,2015-10-03], [user:shef_2318,2015-10-03], [user:xennygrimmato,2015-10-03], [user:sokolov,2015-10-03] and [user:tanmaysahay94,2015-10-0...
**The top 3 Indian teams in this contest, who also qualify for ACM ICPC Regional will have their

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232.
Codeforces Round #617 (Div. 3)
Автор vovuh, история, 7 лет назад, По-русски
Codeforces Round #617 (Div. 3) &lt;almost-copy-pasted-part&gt; Hello! [contest:1296] will start at [contest_time:1296]. You will be offered 6 or 7 problems (or 8) with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have rating 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ACM-ICPC). Thus, during the round, solutions will be judged on preliminary tests, and after the round it will be a 12-hour phase of open hacks. I tried to make strong tests &mdash; just like you will be upset if many solutions fail after the contest is over. You will be given 6 or 7 (or 8) problems and 2 hours to solve them. Note that **the penalty** for the wrong submission in this round (and the following Div. 3 rounds) is **10 minutes**. [Remember] (/blog/entry/59228) that only the <i>trusted participants of the third division</i> will be included in the ...
for combating unsporting behavior. To qualify as a trusted participants of the third division

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233.
Codeforces Round #797 (Div. 3)
Автор Vladosiya, история, 4 года назад, По-русски
Codeforces Round #797 (Div. 3) Hello! [contest:1690] will start at [contest_time:1690]. You will be offered 6-8 problems with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have a rating of 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ACM-ICPC). Thus, solutions will be judged on preliminary tests during the round, and after the round, it will be a 12-hour phase of open hacks. You will be given 6-8 problems and 2 hours and 15 minutes to solve them. Note that the penalty for the wrong submission in this round (and the following Div. 3 rounds) is 10 minutes. [Remember](https://codeforces.me/blog/entry/59228) that only the trusted participants of the third division will be included in the official standings table. As it is written by link, this is a compulsory measure for combating unsporting behavior. To qualify as a trusted parti...
compulsory measure for combating unsporting behavior. To qualify as a trusted participant of the third

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234.
Codeforces Round 1032 (Div. 3)
Автор voventa, история, 15 месяцев назад, По-русски
Codeforces Round 1032 (Div. 3) Hello, Codeforces! &#128075;&#128075;&#128075; [contest:2121] will start at [contest_time:2121]. You will be offered **8** problems with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have a rating of 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ICPC). Thus, solutions will be judged on preliminary tests during the round, and after the round, it will be a 12-hour phase of **open hacks**. After open hacks all accepted solutions will be rejudged on successful hacks. You will be given **2 hours and 15 minutes** to solve the problems. Note that the **penalty** for the wrong submission in this round is **10 minutes**. [Remember](https://codeforces.me/blog/entry/59228) that only the trusted participants of the third division will be included in the official standings table. As it is written by link, t...
compulsory measure for combating unsporting behavior. To qualify as a _trusted participant of the third

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235.
[Blogpost] Indian ICPC 2019 Experience
Автор TheOneYouWant, история, 5 лет назад, По-английски
[Blogpost] Indian ICPC 2019 Experience Hi everyone, I started writing a blog on my experience at the Indian ICPC Regionals of 2019-20 (the previous season as of this post) slightly more than a year back [here](https://codeforces.me/blog/entry/76290). I stopped after 2 blogposts due to various reasons: World Finals not happening, our team losing interest in CP in general, and I kind of wanted to finish the series after the whole season arc was completed. With both my teammates retiring before this season and World Finals finally looking possible in October, I decided to revive it, so I would be able to publish a final post after WF and be done with this season :D. This seemed like the best time to post, since Amrita regionals has it's online round on 10th July, so many teams would probably be up-solving old regionals, and it might be interesting to compare how you performed vs how we did in the contest setting &mdash; what mistakes we made, and what you should avoid. It's also a nice way to preserve my memories, and to h...

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236.
Codeforces Round #531 (Div. 3)
Автор vovuh, история, 8 лет назад, По-русски
Codeforces Round #531 (Div. 3) Happy New Year to all of you! So, meet another round from blue :) &lt;copy-pasted-part&gt; Hello! [contest:1102] will start at [contest_time:1102]. You will be offered 6 or 7 problems with expected difficulties to compose an interesting competition for participants with ratings up to 1600. Probably, participants from the first division will not be at all interested by this problems. And for 1600-1899 the problems will be too easy. However, all of you who wish to take part and have rating 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ACM-ICPC). Thus, during the round, solutions will be judged on preliminary tests, and after the round it will be a 12-hour phase of open hacks. I tried to make strong tests &mdash; just like you will be upset if many solutions fail after the contest is over. You will be given 6 or 7 problems and 2 hours to solve them. Note that **the penalty** for the wrong submis...
for combating unsporting behavior. To qualify as a trusted participants of the third division

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237.
Teams Going to the 2022 ICPC North America Championship
Автор IanDeHaan, история, 4 года назад, По-английски
Teams Going to the 2022 ICPC North America Championship The teams advancing to the NAC this year were announced today. In previous years, someone has made a post with the list of qualifying teams and their known codeforces handles. This year that person is me. If you have any of the missing data, please let me know and I'll add it to the tables. East Central North America ================== | University | Team Name | Member 1 | Member 2 | Member 3 | |-------------------------------------|---------------|------------|----------|----------| | Carnegie Mellon University | CMU1 | ~conqueror_of_tourist,2022-03-26 | ~xumingkuan,2022-03-26 | ~summitwei,2022-03-26 | | University of Waterloo | Waterloo Gold | ~pwypeanut,2022-03-25 | ~ChrisT,2022-03-25 | ~mariand,2022-03-25 | | University of Michigan at Ann Arbor | Victors | | | | | Purdue University | Purdue UWU | | | ...

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238.
IICPC Global Quantfest 2026
Автор Pulkit_gupta, 6 недель назад, По-английски
IICPC Global Quantfest 2026 Hello! Registrations for **IICPC Global Quantfest 2026** are now open. This is 2nd Global IICPC Examination, bringing together Quantitative Finance, Probability, and Competitive Programming, built on IICPC's rich legacy of nurturing top talent. **About IICPC Quantfest** IICPC (Intercollegiate Informatic and Competitive Programming Camp) is a student-led initiative dedicated to advancing competitive programming and quantitative problem solving for the globe. Over the past few years, IICPC has organized bootcamps, contests , recruitment examinations, and educational programs connecting thousands of students with industry and academia. Quantfest is a global quantitative problem-solving festival where the brightest analytical minds tackle challenges inspired by real-world trading and quantitative roles. This year, we are opening participation to international students from 50+ countries. **Registrations go live on July 20, and remain open till August 20.** There is no partic...
- **Selection:** Top 600 + 20 (reserved for women) Indian participants qualify for Regionals. Among, - Up to 5 international students qualify directly to the Finals via Prelims - Up to 5 more may

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239.
ACM-ICPC World Finals 2017: News
Автор MikeMirzayanov, 9 лет назад, По-русски
ACM-ICPC World Finals 2017: News <img src="https://icpc.baylor.edu/cms/welcome-banner-2014/2017FinalsRollerv1.jpg" style="width:500px; float:right; margin: 0 1em 1em 1em;"/> Hello, Codeforces! The ACM-ICPC World Finals 2017 event is running now. Tomorrow will be the main contest. During these days the directorate of ACM-ICPC shared some news. * Let me remind you that this season (2016-2017) is last, when the general sponsor of the championship is IBM. For 20 years, IBM has supported ACM-ICPC, investing millions of dollars annually. Thank you, IBM! At the moment, the model is actively being worked out, when there will be not one general sponsor, but there will be a fund in which several companies will participate. At the opening ceremony the Sport Programming Foundation was mentioned. I believe this Foundation will be the main one for the future seasons of the championship. However, these are not yet close plans. It was announced that the next three years the general sponsor of ACM-ICPC will be JetB...

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240.
Codeforces Round 974 (Div. 3)
Автор RobinFromTheHood, история, 2 года назад, По-английски
Codeforces Round 974 (Div. 3) Hello Codeforces! Greetings from Nottingham, England! We are delighted to invite you to _Legend of Robin Hood_, a round inspired by our local folklore. [contest:2014] will start on [contest_time:2014]. You will be offered 6-8 problems with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have a rating of 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ICPC). Thus, solutions will be judged on preliminary tests during the round, and after the round, it will be a 12-hour phase of **open hacks**. After open hacks all accepted solutions will be rejudged on successful hacks. You will be given **6-8 problems** and **2 hours and 15 minutes** to solve them. Note that the **penalty** for the wrong submission in this round is **10 minutes**. [Remember](https://codeforces.me/blog/entry/59228) that only ...
compulsory measure for combating unsporting behavior. To qualify as a _trusted participant of the third

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241.
Codeforces Round #540 (Div. 3)
Автор vovuh, история, 8 лет назад, По-русски
Codeforces Round #540 (Div. 3) Miss Div. 3 rounds? :) &lt;copy-pasted-part&gt; Hello! [contest:1118] will start at [contest_time:1118]. You will be offered 6 or 7 problems with expected difficulties to compose an interesting competition for participants with ratings up to 1600. Probably, participants from the first division will not be at all interested by this problems. And for 1600-1899 the problems will be too easy. However, all of you who wish to take part and have rating 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ACM-ICPC). Thus, during the round, solutions will be judged on preliminary tests, and after the round it will be a 12-hour phase of open hacks. I tried to make strong tests &mdash; just like you will be upset if many solutions fail after the contest is over. You will be given 6 or 7 (or 8) problems and 2 hours to solve them. Note that **the penalty** for the wrong submission in this round (and the followin...
for combating unsporting behavior. To qualify as a trusted participants of the third division

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242.
Codeforces Round #786 (Div. 3)
Автор vovuh, история, 4 года назад, перевод, По-русски
Codeforces Round #786 (Div. 3) Hello! [contest:1674] will start at [contest_time:1674]. You will be offered 6 or 7 problems (or 8) with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have rating 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ACM-ICPC). Thus, during the round, solutions will be judged on preliminary tests, and after the round it will be a 12-hour phase of open hacks. You will be given 6 or 7 (or 8) problems and 2 hours to solve them. Note that **the penalty** for the wrong submission in this round (and the following Div. 3 rounds) is **10 minutes**. [Remember] (/blog/entry/59228) that only the <i>trusted participants of the third division</i> will be included in the official standings table. As it is written by link, this is a compulsory measure for combating unsporting behavior. To qualify as a <i>trusted partici...
for combating unsporting behavior. To qualify as a trusted participants of the third division

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243.
Codeforces Round #552 (Div. 3)
Автор vovuh, история, 7 лет назад, По-русски
Codeforces Round #552 (Div. 3) This time I have nothing to say except that this round will consist of 7 different problems! &lt;almost-copy-pasted-part&gt; Hello! [contest:1154] will start at [contest_time:1154]. You will be offered 6 or 7 problems (or 8) with expected difficulties to compose an interesting competition for participants with ratings up to 1600. Probably, participants from the first division will not be at all interested by this problems. And for 1600-1899 the problems will be too easy. However, all of you who wish to take part and have rating 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ACM-ICPC). Thus, during the round, solutions will be judged on preliminary tests, and after the round it will be a 12-hour phase of open hacks. I tried to make strong tests &mdash; just like you will be upset if many solutions fail after the contest is over. You will be given 6 or 7 (or 8) problems and 2 hours to solve them. ...
for combating unsporting behavior. To qualify as a trusted participants of the third division

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244.
Invitation to Insomnia Qualifier 2022
Автор GoatTamer, 4 года назад, По-английски
Invitation to Insomnia Qualifier 2022 Hello Codeforces! Computer Club, MNNIT Allahabad, India is glad to invite you to the annual programming competition of MNNIT, INSOMNIA, which is an ACM-ICPC style team programming contest of 2.5 hours duration held on Codeforces during its annual technical fest Avishkar. The team can consist up to 3 members. <b>Contest Details: </b> <ol> <li> Qualifiers: </li> <ul> <li> Start Time: Wednesday, November 9, 21:00 IST</li> <li> Duration: 2.5 hours</li> </ul> <li> Finals: </li> <ul> <li> Start Time: Sunday, November 13, 12:00 IST</li> <li> Duration: 2.5 hours</li> </ul> </ol> **Top 25** global teams, and **Top 25** teams from MNNIT (based on the result of Qualifiers) will qualify to the Finals. The prize distribution for global teams is mentioned below: <br> ![ ](https://i.imgur.com/dqescfm.png) Teams consisting of MNNIT students only will be eligible for a seperate prize pool. Register your team for the qualifiers here: https://forms.gle/BKsbKfoGzSxC394R8 <br>...
if you have qualified through the previous round. (Qualified teams will be sent an email for

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245.
IOI 2015 — Participants
Автор Azret, история, 11 лет назад, По-русски
IOI 2015 — Participants <center><a href="https://docs.google.com/forms/d/1HO_IY9NxElzPmBVGXzxbv_KDH3t_uOT7v1PKCZrPUtk/viewform#start=invite" style="width:300px;padding:15px;background:#009e55;color:#ffffff;font-size:18px;">Add Participant</a> <a href="https://docs.google.com/spreadsheets/d/1_D1M3KL3Cio74BPtIiog3iqSsIif8yjpp14dBEXk5c8/edit?usp=sharing" style="width:300px;padding:15px;background:#1d45d8;color:#ffffff;font-size:18px;">View Participants</a></center> Name | CF Handle | Country | Previous IOIs | :----:|:---------:|:-------:|:-------------:| [Román Castellarin](http://stats.ioinformatics.org/people/3173) | [user:ponysalvaje,2015-06-29] | Argentina | 2013 2014 | Ariel Nowik | [user:ariel.nowik,2015-06-29] | Argentina | No Participation | Martin Mirakyan | [user:Martin97,2015-06-29] | Armenia | No Participation | [Mushegh Shahinyan](http://stats.ioinformatics.org/people/5017) | [user:Mushegh,2015-06-29] | Armenia | 2014 ![S] | Albert Gevorgyan | [user:albertg,2015-06-29] | Armenia | No Parti...
**Congratulations! To those who qualified for IOI 2015 :)**

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246.
Invitation to IndiaHacks 2nd Elimination 2017
Автор Lewin, история, 9 лет назад, По-английски
Invitation to IndiaHacks 2nd Elimination 2017 On [Sunday, August 6th, 22:00 IST](https://www.timeanddate.com/worldclock/fixedtime.html?iso=20170806T22&p1=438&ah=3), we will hold the 2nd elimination for IndiaHacks (some more details [here](http://codeforces.me/blog/entry/52069)). The top 900 individuals who qualified through previous rounds will have the opportunity to participate in this round. The top 25 global participants and top 25 Indian participants will advance to the final round. The link to the contest is [here](https://www.hackerearth.com/challenge/competitive/indiahacks-2017-programming-wave-20-eliminator/). After the official round is over, the next morning, on [Monday, August 7th, 11:35 IST](https://www.timeanddate.com/worldclock/fixedtime.html?day=7&month=8&year=2017&hour=9&min=5&sec=0&p1=166), we'll hold an unofficial unrated mirror here on Codeforces. This mirror will have ICPC rules. For participants of the official round, please hold off on discussing the problems publicly until after this mirror is over. ...
://codeforces.com/blog/entry/52069)). The top 900 individuals who qualified through previous rounds

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247.
Codeforces Round #550 (Div. 3)
Автор vovuh, 7 лет назад, По-русски
Codeforces Round #550 (Div. 3) Hello! Hope you missed me :) As far as some people say, because of copy-pasted announcement this round wouldn't be interesting. But the real thing is that I'm very sick now and I'm very glad that I prepared this round at all. Hope you will enjoy it. Good luck to all! &lt;copy-pasted-part&gt; Hello! [contest:1144] will start at [contest_time:1144]. You will be offered 6 or 7 problems (or 8) with expected difficulties to compose an interesting competition for participants with ratings up to 1600. Probably, participants from the first division will not be at all interested by this problems. And for 1600-1899 the problems will be too easy. However, all of you who wish to take part and have rating 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ACM-ICPC). Thus, during the round, solutions will be judged on preliminary tests, and after the round it will be a 12-hour phase of open hacks. I tried to make stro...
for combating unsporting behavior. To qualify as a trusted participants of the third division

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248.
2024-2025 ICPC, NERC, Southern and Volga Russian Regional Contest [Online Mirror, ICPC Rules]
Автор BledDest, 22 месяца назад, По-английски
2024-2025 ICPC, NERC, Southern and Volga Russian Regional Contest [Online Mirror, ICPC Rules] **Note that initially this contest was scheduled on a different day. Due to technical difficulties, we had to postpone the online mirror. We are sorry about that; if you planned to participate, but are no longer able because the contest day has changed, you can use the virtual participation option.** Hello Codeforces! The Southern and Volga Russian Regional Contest was held in Saratov State University yesterday, on 12th of November. This contest was used to qualify the teams from Southern Russia and Volga region to the Northern Eurasia Finals. On [contest_time:2038], we will conduct the online mirror of this contest. It will last for 5 hours and is best suited for **teams of three people**, although it is not forbidden to participate in teams of smaller/larger size. The mirror will use ICPC rules, the same as the offline contest. The contest was prepared by [user:adedalic,2024-11-13], [user:awoo,2024-11-13], [user:dmitryme,2024-11-13], [user:elena,2024-11-13], [user:Neon,20...
12th of November. This contest was used to qualify the teams from Southern Russia and Volga region

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249.
Codeforces Round #570 (Div. 3)
Автор vovuh, история, 7 лет назад, перевод, По-русски
Codeforces Round #570 (Div. 3) &lt;almost-copy-pasted-part&gt; Hello! [contest:1183] will start at [contest_time:1183]. You will be offered 6 or 7 problems (or 8) with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have rating 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ACM-ICPC). Thus, during the round, solutions will be judged on preliminary tests, and after the round it will be a 12-hour phase of open hacks. I tried to make strong tests &mdash; just like you will be upset if many solutions fail after the contest is over. You will be given 6 or 7 (or 8) problems and 2 hours to solve them. Note that **the penalty** for the wrong submission in this round (and the following Div. 3 rounds) is **10 minutes**. [Remember] (/blog/entry/59228) that only the <i>trusted participants of the third division</i> will be included in the ...
for combating unsporting behavior. To qualify as a trusted participants of the third division

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