— 1000 — 1500 — 2000 — 2750 — 3500 **UPD 2.** Due to yesterday's registration
troubles the start, **UPD 2.** Due to yesterday's registration troubles the start of the contest is
delayed by 10
→ Pay attention
→ Top rated
| # | User | Rating |
|---|---|---|
| 1 | Benq | 3676 |
| 2 | Kevin114514 | 3659 |
| 3 | jiangly | 3640 |
| 4 | turmax | 3450 |
| 5 | tourist | 3408 |
| 6 | strapple | 3360 |
| 7 | Um_nik | 3354 |
| 8 | squareOf105 | 3348 |
| 9 | maroonrk | 3312 |
| 10 | idontwannadothis…e | 3191 |
→ Top contributors
| # | User | Contrib. |
|---|---|---|
| 1 | Qingyu | 154 |
| 2 | nik_exists | 151 |
| 3 | maspy | 149 |
| 4 | AmShZ | 146 |
| 5 | Um_nik | 143 |
| 6 | Errichto | 139 |
| 7 | BledDest | 136 |
| 8 | adamant | 135 |
| 9 | maroonrk | 133 |
| 10 | cry | 130 |
→ Find user
→ Recent actions
You can use several words in query to find by all of them at the same time. In addition, if you are lucky search understands word forms and some synonyms. It supports search by title and author. Examples:
305— search for 305, most probably it will find blogs about the Round 305andrew stankevich contests— search for words "andrew", "stankevich" and "contests" at the same timeuser:mikemirzayanov title:testlib— search containing "testlib" in title by MikeMirzayanov"vk cup"— use quotes to find phrase as istitle:educational— search in title
Results
1.
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...
2.
Codeforces: Results of 2023 [Annual Report] Hello, Codeforces.
Let's recall 2023, shall we?
In this post, I want to summarize this year. You know, a lot of terrible things happen in the world, and personally, this year was the hardest and most sorrowful for me. But today, we'll remember something else. We'll remember what this year was like for Codeforces.
Recently, Codeforces turned 14 years old. Not bad, right? And for many years now, when asked "What is Codeforces?" the first thing I say is — it's a community!
[cut]<br/>
#### Personal Thanks!
On behalf of the community (and myself), I say thank you to everyone who tries, helps, and makes efforts to keep the community alive.
Thank you to the developers! Although I continue to engage in development and other technical activities, I'm glad that these guys made an effort and improved the platform: [user:geranazavr555,2024-02-04], [user:unreal.eugene,2024-02-04], [user:vbandurin,2024-02-04], [user:ChurakovaAlexandra,2024-02-04], [user:medvezhonokok,2024-02-04]...
3.
Codeforces: summing up 2016 year <center>
<img src="http://assets.codeforces.com/images/Happy-New-Year-HD-Wallpapers.jpg"/>
</center>
Somehow it turns out that for me, each coming the New Year means more and more. This is an excellent opportunity to take stock, to breathe fresh air and to go through a kind of catharsis. This is a rare opportunity to be with the family, dress up in Santa Claus and just have fun.
Holidays give me a clear criterion that I do the right things. If during the holidays, I begin to think about it, to recall some deferred ideas, eager to implement something new. So I’m doing right things. My things. And now exactly the same as in several recent years: during New Year holidays I write code for Codeforces, trying new technology or simply I’m making minor changes in testlib. It is necessary to me: at this moment are no deadlines, do not press the obligation. Just now, at 3 am, I can not break away from being able to do something new. I would like to take a moment and realize that spun in ...
(for managers) * website mobile view * improved support of user lists *
extendedregistration to, ) * website mobile view * improved support of user lists * extended registration
to the rounds * fixes in
4.
Meta Hacker Cup 2025 Schedule Meta Hacker Cup 2025
==================
Meta Hacker Cup is back! We’re excited to announce our schedule for our 2025 season, kicking off on October 10th!
- Practice Round: [Fri. October 10th, 10am Pacific (120 hours, 5 days)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Meta+Hacker+Cup+Practice+Round&iso=20251010T10&p1=234)*
- Round 1: [Sat. October 18th, 10am Pacific](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Meta+Hacker+Cup+Round+1&iso=20251018T10&p1=234&ah=3) (3 hours)
- Round 2: [Sat. November 1st, 10am Pacific](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Meta+Hacker+Cup+Round+2&iso=20251101T10&p1=234&ah=3) (3 hours)
- Round 3: [Sat. November 15th, 10am Pacific](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Meta+Hacker+Cup+Round+3&iso=20251115T10&p1=234&ah=3) (3 hours)
- Finals: [Sat. December 13th, 6am Pacific](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Meta+Hacker+Cup+Finals&iso=20251213T06&p1=234&ah=4...
details on Friday when registration opens, but at a high level, you can expect
a single AI track with, ). Registration will open **Friday, October 3rd**. [Register
here](https://www.facebook.com, **Update:** Registration is now open -- [Register
here](https://www.facebook.com/codingcompetitions, /hacker-cup). Registration will open **Friday, October 3rd**. [Register
here](https, registration date with default settings on a single inference attempt per
problem to represent them
5.
Codeforces: Results of 2017 <img src="/predownloaded/e4/09/e40915ee54c5991b91098756a90270d94be893b3.jpg"/>
Happy New Year, Codeforces!
I hasten to wish the whole community (and including me) correct programs, sudden insights, beautiful ideas and interesting problems!
I hope that you have met the new year at least as fun as I am. Have you had enough sleep after New Year's Eve? This year, the traditional post summarizing the past year, I sat down to write only on January 1, 2018. I hope that I will not have to sum up the whole year.
This post is important to me, since it draws a line to all the work done by the Codeforces team and the entire community in 2017. Many thanks to the team: all of the achievements listed below are the result of joint efforts. We did an excellent job! The community must know its heroes. In 2017, [user:MikeMirzayanov,2018-01-02], [user:KAN,2018-01-02] (problem coordinator), ~gritukan,2018-01-02 (second problem coordinator), ~netman,2018-01-02 (ex-second problem coordinator), ~k...
6.
Testing Round 19 [unrated registration testing] Hello!
We are starting to test the long-awaited feature of non-rated registration for rounds. Here’s the plan: we will first test this feature in [contest:2010]. Then, we will apply this innovation for ICPC-like rounds (Div. 4 Rounds, Div. 3 Rounds, Educational Rounds). After we have tested the feature in ICPC-like rounds, we will start using it in other types of rounds as well.
Here’s how the feature works:
* When you register for a round (if it is rated for you), you can choose non-rated registration if you do not expect to perform at your best (for example, if you might be interrupted during the round).
* You can change your registration type (rated or non-rated) BEFORE THE ROUND STARTS.
Once the round starts, you cannot change your registration type.
* If you register for a round after it has started, you will automatically be registered as rated (if the round is rated for you). In other words, you will not be given the option to register as non-rated.
* After the roun...
Testing Round 19 [unrated registration testing], choose your registration type so that we have both rated and non-rated
registrations., * When you register for a round (if it is rated for you), you can choose
non-ratedregistration if, Hello! We are starting to test the long-awaited feature of non-rated
registration for rounds, We are starting to test the long-awaited feature of non-rated registration for
rounds. Here’s the
7.
Hacking (as a CF feature) does not fit modern competitive programming 1. How does hacking work with the new feature of unrated registration? I have seen this question raised in the comments to the announcement several times, but there is no answer still and I think it's weird that Mike hasn't thought about it before announcing.
2. I was working recently on a div.2 Codeforces round (still might happen in the future) and I was told by my coordinator that pretests should be equal to systests in all the problems. From this I can conclude that it is a Codeforces policy and intentionally weak pretests do not happen. It doesn't mean that it is impossible to hack anybody, but it doesn't sound like a viable strategy. I find it weird that this information is not public, it's like I'm getting bonus information about all other Codeforces rounds by setting a round myself.
I have done exactly zero research on the matter, but my feeling is that 99% of hacks (I'm talking about during-the-round-hacking here, not open hacking of education rounds and such) happen in ...
1. How does hacking work with the new feature of unrated registration? I have
seen this question
8.
1st Universal Cup Announcement Hello everyone, we are happy to announce that the 1st Universal Cup is started officially.
Universal Cup is a non-profit organization dedicated to providing training for competitive programming teams. Our website is [https://ucup.ac/](https://ucup.ac/) (in English and Chinese).
In recent years, Chinese problem-setter teams have created a great number of high-quality contests. We have reached an agreement with most of these setters, that they agree to provide contest materials to Universal Cup for hosting mirror contests before publishing the set in public. We believe that such an arrangement can provide good opportunities to teams who want to do better in the future competing.
Every year, with the permission of the problem setter team and without involving copyright disputes, the Universal Cup will hold mirror contests for some undisclosed competition sets. It is expected to hold at least 10 contests a year. We will simulate the actual situation in the competition, using the ...
. We require registration to participate in the Universal Cup, please follow
the instruction on, We require registration to participate in the Universal Cup, please follow the
instruction on the
9.
CodeTON Round 7 (Div. 1 + Div. 2, Rated, Prizes!) Hello Codeforces,
We are very glad to invite you to participate in [contest:1896], which will start on [contest_time:1896]. You will be given **8 problems** and **2.5 hours** to solve them. The round will be rated for everyone.
All the problems are written and prepared by [user:lanhf,2023-11-22], [user:Mike4235,2023-11-22], [user:thenymphsofdelphi,2023-11-22], [user:xuanquang1999,2023-11-22] and me.
We would like to give our sincere thanks to:
- [user:errorgorn,2023-11-22] for his wonderful coordination!
- [user:Alexdat2000,2023-11-22] for translating problem statements.
- [user:Um_nik,2023-11-22] and [user:conqueror_of_tourist,2023-11-22] for Legendary Grandmaster testing.
- [user:jeroenodb,2023-11-22], [user:Kuroni,2023-11-22], [user:dario2994,2023-11-22] and [user:dreamoon_love_AA,2023-11-22] for International Grandmaster testing.
- [user:generic_placeholder_name,2023-11-22], [user:MofK,2023-11-22], [user:minhcool,2023-11-22], [user:dvdg6566,2023-11-22] and [user:mag...
**UPD1:** The contest is delayed by 15 minutes due to prior issues with the
registration system in, :** The contest is delayed by 15 minutes due to prior issues with the
registration system in order to
Announcement of CodeTON Round 7 (Div. 1 + Div. 2, Rated, Prizes!)
10.
Codeforces Blitz Cup 2026 <center style="margin: 2em;">
<img src="/predownloaded/a7/e8/a7e8478b9af90246ebd2a4e42b9bbbafd392b64f.png"/>
</center>
Hi Codeforces!
I have a great announcement for you. This month, we're holding the second Codeforces Blitz Cup! Remember all the WA1s and CEs we've seen from LGMs stressing out to submit before the opponent? They are coming back!
The Codeforces Blitz Cup is a single-elimination personal tournament where matches follow the special Blitz Rules. In short, each match is a 40-minute PvP contest, where problems open one by one, and only the first AC counts. The players can't use any help or prewritten code except a small template, and we get to watch them think and code live.
- [Detailed rules](/r/blitz-rules)
- [Bracket](/publish/blitz2026/bracket.html)
Check out last year's final rounds streams: [day 1](https://www.youtube.com/watch?v=caoeMuNNQtg&embeds_referring_euri=https%3A%2F%2Fcodeforces.com%2F), and the [final day 2](https://www.youtube.com/watch?v=...
- Registration deadline: **February 12, 10:00 UTC** - Elimination rounds:
February 13th to 26th (free
11.
[Repost] "Justice may be delayed, but it cannot be absent": New Evidence on
NXIST's Cheating Scandal
[Repost] "Justice may be delayed, but it cannot be absent": New Evidence on NXIST's Cheating Scandal _Original post: [「正义可以迟来但不能缺席」：关于 NXIST 的一些新证据](https://zhuanlan.zhihu.com/p/620297880)_
_Translated by GPT-4 with some adjustment. Please inform me if there are any mistakes._
_All links to the invalid repository have been redirected to the backup repository._
**This article provides a logically complete set of evidence, which does not involve any non-public internet resources, regarding the "suspected cheating" incident involving the ICPC Yinchuan Station and ICPC Shenyang Station in 2021. By discovering the suspected GitHub account ([NaokiLH](https://github.com/NaokiLH), renamed to https://github.com/brokenTarget) of a team member from Ningxia Institute of Science and Technology (NXIST) TS 1 team, Lan Hao, two years ago, and by mining and analyzing the commit records of his algorithm competition repo, we have obtained direct evidence that at least 4 questions from the 2021 Yinchuan regional contest set and at least 6 questions (including scrapped questions) from the 2021 Sh...
competition that requires registration to view the problems, we also provide a
preview of the problem, registration to view the problems, we also provide a preview of the problem
statement here:
12.
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...
just as registration fees, along with sponsorships and stuff] to be far worse
then online contests
13.
PinkieRabbit Cheated in Div. 1 Contest on Apr 27 I am writing to report an incident of cheating by PinkieRabbit during the recent contest 1965 on Codeforces. **PinkieRabbit asked help about problem D from others during the contest,** which is definitely against the contest rules.
I have attached the evidence of the cheating behavior in the appendix, please read it. This evidence clearly shows the communications PinkieRabbit had with another person during the contest. It is a contest recording video published after contest by himself. As a former fan of PinkieRabbit, after seeing this video, I was shocked by how dishonest PinkieRabbit was. I believe such actions undermine the integrity of the competition and the platform as a whole. [user:win114514,2024-05-05] cheated by grouping up in contest 1905, finally punished by skipping. Therefore, I respectfully request that Codeforces take appropriate action against PinkieRabbit to maintain the fairness of the contests on Codeforces.
He only cheated in one problem this round, so I sugg...
all comment sections except the first two comments may require an account
registration with a phone
14.
Codeforces: results of 2014 <img src="http://assets.codeforces.com/images/statistics-2014/snowman-en.png" style="float:right; margin:0 1em 1em 1em;"/>
Hello 2015! Hello Codeforces!
It seems it is time to take stock. Frankly, I was almost feared to start summing statistics of 2014. In 2013 Codeforces showed rapid growth so that it would not be surprising to look bad on the background of 2013. Certainly not! I was pleasantly surprised by the statistics and reports!
Just below is a list of major events and achievements of Codeforces over the year. For you, it's just a list, but please note — every item includes hard work of multi-day Codeforces team, writers of problems, the organizers of contests and tournaments, problem testers and volunteers. Yay! Together we have done all of this:
* introduced Codeforces API
* added (and sometimes improved) all Andrew [user:andrewzta,2015-01-03] Stankevich contests
* Codeforces supported mode to work as iframe-widget, and Codeforces helped Google to run https...
] registration ends.
15.
Codeforces: Results of 2019 <a style="float:right; display: inline-block; margin:0 1em 1em 2em; max-width: 60%;" href="https://codeforces.me/10years"/>
<img style="max-width:100%" src="https://assets.codeforces.com/images/codeforces-10-years-300.png"/>
</a>
Hi Codeforces!
The platform recently turned 10 years old. We accept your congratulations at <a href="https://codeforces.me/10years">https://codeforces.me/10years</a>.
Please review the progress in 2019 and support the anniversary crowdfunding campaign. Your donation will be a contribution to the future of Codeforces, will
help its development and work. We need resources to continue to host rounds, not to stop developing,
to innovate and to maintain the existing infrastructure.
In 2019, together with numerous writers the coordinators worked on problems: [user:KAN,2020-02-06], [user:300iq,2020-02-06], [user:cdkrot,2020-02-06], [user:arsijo,2020-02-06] and recently joined [user:isaf27,2020-02-06]. And this year,
rounds coordinated by other exper...
1. New user self-registration in domain groups 1. MathJax support in posts and
comments 1
16.
2nd Universal Cup Announcement Hello everyone, we are happy to announce that the 2nd Universal Cup has started officially.
The Universal Cup is a non-profit organization dedicated to offering training resources for competitive programming teams. Our website is [https://ucup.ac/](https://ucup.ac/) (in English and Chinese).
In the previous season, over 750 teams from more than 300 affiliations all over the world, registered and participated in a total of 22 stages, encompassing contests from Asia, Europe, and America.
With the permission of contest setters and without involving copyright disputes, the Universal Cup will hold mirror contests for some undisclosed competition sets. It is expected to hold at least 20 contests in this season. We will simulate the actual situation in the competition, executing the board freeze in the last hour. At the same time, we will provide an overall rating board, which will help the team to make a reasonable assessment of itself.
Over the past few weeks, the committee has...
, the same as new teams, please register following the instructions on [
Registration](https
17.
The 3rd Universal Cup. Stage 38: Guangzhou (CCPC Finals 2024) Hi everyone! We are thrilled to invite you to The 3rd Universal Cup, Stage 38: Guangzhou, taking place on May 24th, 2025.
The contest is based on the Finals of the CCPC (China Collegiate Programming Contest), which was held on May 11th, 2025. This is my third time to be a judge on the CCPC Finals, and probably my last experience of my judging experience in high school.
This contest is prepared by [user:Gellyfish,2025-05-22], [user:johnvictor,2025-05-22], [user:jqdai0815,2025-05-22], [user:Kevin114514,2025-05-22], [user:Kubic,2025-05-22], [user:lynkcat,2025-05-22], [user:Milmon,2025-05-22], [user:ODT,2025-05-22], [user:orzdevinwang,2025-05-22], [user:Qingyu,2025-05-22]， [user:rddccd].
Although the style of problems differs a lot, the difficulty of this problem set is close to the ICPC World Finals or Regional Semifinals (NERC Finals or Asia EC Finals). We believe the problems will be engaging for participants of all levels while still providing a challenge for the strongest te...
Register a new team: https://ucup.ac/register (the registration request will be
processed before
18.
Meta Hacker Cup 2024 Schedule — Introducing the Meta Hacker Cup AI Track Meta Hacker Cup 2024
==================
Meta Hacker Cup is back! We’re excited to announce our schedule for our 2024 season, kicking off on September 20th!
- Practice Round: [Fri. September 20th, 10am Pacific (72 hours)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Meta+Hacker+Cup+Practice+Round&iso=20240920T10&p1=234)*
- Round 1: [Sat. October 5th, 10am Pacific](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Meta+Hacker+Cup+Round+1&iso=20241005T10&p1=234&ah=3) (3 hours)
- Round 2: [Sat. October 19th, 10am Pacific](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Meta+Hacker+Cup+Round+2&iso=20241019T10&p1=234&ah=3) (3 hours)
- Round 3: [Sat. November 2nd, 10am Pacific](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Meta+Hacker+Cup+Round+3&iso=20241102T10&p1=234&ah=3) (3 hours)
- Finals: [Sat. December 7th, 6am Pacific](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Meta+Hacker+Cup+Finals&iso=20241207T10&p1=234&ah=4) (4 hou...
). Registration will open July 24th. You can expect familiar prizes in the
human track, including T-Shirts, /hacker-cup). Registration will open July 24th.
19.
Codeforces Round #691, based on ByteDance — Moscow Workshops Online Contest 
Hello, Codeforces community!
I'm glad to invite you to Codeforces Round #691 (Div. 1) and Codeforces Round #691 (Div. 2), which will be held on [contest_time:1459]. **The round will be rated for both divisions.**
The problems were taken (mostly) from the ByteDance — Moscow Workshops Online Contest, which is happening at the same time. They were prepared by me, [user:AndreySergunin,2020-12-17], and [user:amethyst0,2020-12-17]. We are very thankful to the testers: [user:low_,2020-12-18], [user:__rkm__,2020-12-18], [user:ecnerwala,2020-12-18], [user:Tima,2020-12-18], [user:IITianUG,2020-12-18], [user:thenymphsofdelphi,2020-12-18], [user:mohammedehab2002,2020-12-18], [user:namanbansal013,2020-12-19], [user:Redux,2020-12-19] for their time and great feedback. Also big thanks to Bytedance instructors [user:chenjb,2020-12-18] and [user:MiFaFaOvO,2020-12-18] for testing and r...
You can find more information about this training camp, including registration
and prizes at [https
Announcement of Codeforces Round 691 (Div. 1)
Announcement of Codeforces Round 691 (Div. 2)
20.
Codeforces: Results of 2020 [list some changes and improvements] Hello, Codeforces!
I understand that 2021 has been going on for a long time, but here I have picked up a subset of some of the improvements that the Codeforces team made in 2020. Soon I will publish numbers (no, charts) with statistics for 2020. In the meantime, I bring to your attention a list of changes and improvements.
By the way, this is a decent list. This is about half to a quarter of all changes. It's just that other changes are more often somewhere in the internals of the system and are not visible to users. Please read this list. Each item is the effort of someone from the team. Thanks to [user:geranazavr555,2021-03-14], [user:kuviman,2021-03-14] and [user:cannor147,2021-03-14] for their efforts. You've made our platform better! Well, by the way, I don't quit programming and many improvements were made by me.
The items on the list are written in a concise and informal form, many of the items I just copied from commit messages from git. If you want more details &mdash...
(Polygon) * Better diagnostics for c++ * Java 11 support * The better
registration process, registration process (Polygon) * Improved performance of web pages in case of
huge manual (not generated
21.
[CONTEST OVER] MIT Informatics Tournament 2024 Spring Invitational **Update 2**: The Qualification Round has **officially concluded**! A huge thank you to our contestants for joining us and supporting this new initiative! Congratulations to the top 16 finalists who are advancing to the finals round (along with many more as we continue to confirm people's availability)!
1. [user:Rewinding,2024-04-24]
2. [user:ksun48,2024-04-24]
3. [user:Petr,2024-04-24]
4. [user:Geothermal,2024-04-24]
5. [user:mango_lassi,2024-04-24]
6. [user:hank55663,2024-04-24]
7. [user:ecnerwala,2024-04-24]
8. [user:MiFaFaOvO,2024-04-24]
9. [user:Kevin114514,2024-04-30]
10. [user:A_G,2024-04-30]
11. [user:Adam_GS,2024-04-24]
12. [user:Tourist,2024-04-24]
13. [user:FlowerOfSorrow,2024-04-24]
14. Matthew Allan
15. [user:uwu,2024-04-24]
16. [user:TLE,2024-04-24]
At this time, the scoreboard has been finalized, and you can upsolve our problems / watch our video tutorials with the following links:
- Finalized Scoreboard: [https://mitit.org/Contest/ViewScoreboar...
For more information, check out [our website](http://mitit.org), and the [
registration](https
22.
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 — Janua...
international students. The deadline for registration is 15th January, 23:59
IST**., **Registration**, registration is 15th January, 23:59 IST**.
23.
Japanese Olympiad in Informatics (JOI) Spring Camp 2020 Hello Everyone!
Japanese Olympiad in Informatics Spring Camp 2020 will be held from Mar. 19 to Mar. 23.
There will be four online mirror contests during the camp.
- day1 : [Mar. 20 (01:00 — 06:00 GMT)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Japanese+Olympiad+in+Informatics+Spring+Camp+2020&iso=20200320T10&p1=248&ah=5) or [Mar. 20 (07:30 — 12:30 GMT)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Japanese+Olympiad+in+Informatics+Spring+Camp+2020&iso=20200320T1630&p1=248&ah=5)
- day2 : [Mar. 21 (01:00 — 06:00 GMT)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Japanese+Olympiad+in+Informatics+Spring+Camp+2020&iso=20200321T10&p1=248&ah=5) or [Mar. 21 (07:30 — 12:30 GMT)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Japanese+Olympiad+in+Informatics+Spring+Camp+2020&iso=20200321T1630&p1=248&ah=5)
- day3 : [Mar. 22 (01:00 — 06:00 GMT)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Japanese+Olympiad+in+Informatics+...
The contest site and registration form will be announced about 30 minutes
before the contest.
24.
Codeforces Round #530 Hello everybody!
Now the winter SIS (Summer Informatics School) is taking place, and we, as part of the parallel A+ with its teachers, have prepared a complete Codeforces Round.
The round will happen at [contest_time:1098] and will last for 2.5 hours. There will be 6 problems in each division.
The tasks of the round were invented and prepared by [user:300iq,2019-01-04], [user:scanhex,2019-01-04], [user:cookiedoth,2019-01-04], [user:allrats,2019-01-04], [user:osaaateiasavtnl.,2019-01-04], [user:Qlukva,2019-01-04], [user:Forestryks,2019-01-04], [user:Dimon,2019-01-04], [user:LordVoldebug,2019-01-04], [user:romanovsavelij,2019-01-04], [user:golub,2019-01-04], [user:ismagilov.code,2019-01-04],[user:alexey_kuldoshin,2019-01-04], [user:LadyPython,2019-01-05], [user:UnstoppableSolveMachine,2019-01-05] under the guidance of teachers [user:izban,2019-01-04], [user:VArtem,2019-01-04], [user:_meshanya_,2019-01-04], [user:pashka,2019-01-04].
Also thanks for testing [user:isaf27,2019-0...
everybody! **UPD**: Since the registration opens before the recalculation of
the rating after Hello 2019, **UPD**: Since the registration opens before the recalculation of the rating
after Hello 2019, in
Announcement of Codeforces Round 530 (Div. 1)
25.
MIT Informatics Tournament 2025-26 Winter Contest **UPD 4:** The contest problems and editorials are available in Codeforces gym:
[MITIT Winter 2025-26 Advanced Team Round](https://codeforces.me/gym/106250)
[MITIT Winter 2025-26 Beginner Round](https://codeforces.me/gym/106251)
[MITIT Winter 2025-26 Advanced Individual Round](https://codeforces.me/gym/106249)
**Editorials:** [Team Round Editorials](https://codeforces.me/gym/106250/attachments/download/34709/MITIT_Winter_2025_2026_Team_Editorials-1.pdf).
**UPD 3:** All contests have ended. Thank you all for participating! We will release the rankings and editorials soon.
**UPD 2:** The team contest has officially started. You can view the [live scoreboard](https://mitit.org/Contest/ViewScoreboard/advanced-team-25-26) here.
**UPD 1:** The contest has officially started. Good luck and have fun!
Please join our Discord server [here](https://discord.gg/gmTUzcezv4) for the latest information!
Hello Codeforces!
We ( [user:ETK.,2025-11-06], [user:flame...
excited to announce that registration is now **OPEN** for the **MIT
Informatics Tournament 2025–26, ** as well as **online**. Registration link: [https://mitit.org/Registration
](https://mitit.org, The registration deadline is **November 23rd, 2025** for the in-person
competition and **November, ], [user:Wang238328,2025-11-05]), current students at MIT, are excited to
announce thatregistration is now
26.
Let's allow registration during a contest It happened to me twice to skip a CF round because of the registration.
Once I was too late, and once I even implemented A and tried to submit — but it turned out I haven't registered.
It also happened to some of my friends.
For standard CF rounds the registration ends 5 minutes before the contest.
The reason is that participants must be divided into rooms, to be able to hack.
But hacking isn't so important, right?
It's some extra possibility and many would enjoy a round even without hacks.
Let's allow participating without having a room.
All people registered at least 5 minutes before should be assigned to rooms as usually.
And after that, one should be able to register "out of room" — to participate without hacking and being hacked.
A round should be rated for everybody.
So, one could register after reading problems, and maybe even after implementing something.
Note that hacks are only a privilege.
It's good to be hacked instead of getting WA on systest...
Let's allow registration during a contest, For standard CF rounds the registration ends 5 minutes before the contest. The
reason is that, It happened to me twice to skip a CF round because of the registration. Once I
was too late, and
27.
Valentine's Day Contest 2020 Hello everyone!
Will you be single and bored during Valentine's Day? Never fear, as [user:zscoder,2020-02-06] is here to cure your boredom.
I would like to invite you to Valentine's Day Contest 2020, which will take place on [Friday, February 14, 2020 at 12:30 GMT](https://www.timeanddate.com/worldclock/fixedtime.html?iso=20200214T2030&p1=122&ah=3&am=30). The contest is unofficial and unrated, but the quality of most (if not all) of the problems are comparable to problems from a Codeforces round. I am the author of all problems.
The contest format will be IOI format, which means that each problem is worth $100$ points, and there are subtasks for each problem. There will be no time penalty. The problems are **not sorted in increasing order of difficulty**. Unlike IOI, you are allowed to use any templates or notes you have.
There are **7 problems** to be solved in **3.5 hours**. There is an interactive problem, so feel free to learn about them [here](https://codeforces.me/...
contest is now available on [Gym](https://codeforces.me/gyms). Registration
opens $6$ hours before
Announcement of Valentines Day Contest 2020
28.
Codeforces: Extra Registration on Rounds Hello.
Now it became much unlikely to skip a round due to carelessness during the registration. In the coming rounds (in experimental mode) we will add new feature _extra registration_ (it is good terminology? _additional registration_?).
This means that after the period of regular registration (as usual, 5 minutes before the start of a round it will be closed) there will be another additional period of registration. It will start in 10 minutes after the start of the round with duration of 20 minutes, that is, it will close after 30 minutes from the start of the round.
The role of the 10 minutes is twofold:
* on the one hand it is quite possible to solve the easiest problem in the first 10 minutes — so it makes a motivation to register on time,
* on the other hand the system is loaded much during the first minutes of a round, as a registration invalidates some internal caches it is better to open extra registration after 10 minutes.
When registering during the ext...
Codeforces: Extra Registration on Rounds, the first minutes of a round, as a registration invalidates some internal
caches it is better to, Hello. Now it became much unlikely to skip a round due to carelessness during
theregistration, Now it became much unlikely to skip a round due to carelessness during the
registration. In the, This means that after the period of regular registration (as usual, 5 minutes
before the start of a
29.
Help Egypt Fly to IOI 2025 **UPD: WE ARE FLYING TO THE IOI! Thanks to everyone who donated and all organizations that supported our journey!** We got support for our international flights from several organizations and the raised money through the crowdfunding will go towards funding our domestic flights and IOI registration.
Hello Codeforces,
I, along with [user:contee,2025-06-24], [user:is-this-dp,2025-06-24], and [user:3omar_ahmed,2025-06-24], am a member of Egypt's IOI 2025 team. For the past few years, the Ministry of Communications and Information Technology has supported the Egyptian IOI team to attend the competition. However, this year we are not receiving any institutional or government support.
We worked hard over the past year to get ready for the competition. The cost of attending the IOI for the Egyptian delegation, which includes our flight tickets, visa, and registration costs, is difficult for us to cover, especially given the current economic situation in Egypt. We have reached out to ...
for the Egyptian delegation, which includes our flight tickets, visa, and
registration costs, is, raised money through the crowdfunding will go towards funding our domestic
flights and IOIregistration
30.
For contest writers: proposal tracking system <i>In 2021, some details (including requirements for problem writers) were changed. Read <a href="https://codeforces.me/blog/entry/85259">the link</a> for details.</i>
Hello, Codeforces!
New year brings changes to the Codeforces team. <a href="/blog/entry/49466">As you probably know</a> [user:GlebsHP,2017-01-04] completed his work as the chief coordinator of Codeforces. Gleb, thanks a lot! You did an excellent job and coordinated a lot of interesting rounds. You're a professional, an interesting person, you have impeccable taste to problems, and you proved to be brilliant and talented writer. Thank you that you were with us!
Hope to see your tasks on Codeforces many times again!
Nikolay [user:KAN,2017-01-04] Kalinin came to Gleb's place. He is also an experienced participant, Nikolay has already held several rounds as a coordinator. [user:KAN,2017-01-04] seriously engaged in programming contests since he was 12 years old. His major achievements: he won twice All-Russian Scho...
31.
JOI Spring Training 2024 Online Contest Hello, everyone!
[Japanese Olympiad in Informatics (JOI) Spring Training 2024](https://contests.ioi-jp.org/joi-sp-2024/index-en.html) will be held from March 21 to March 24. There are **4 days** in the contest.
* Day 1: [March 21, 02:00 GMT — March 21, 24:00 GMT](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Japanese+Olympiad+in+Informatics+%28JOI%29+Spring+Camp+2024+Day1&iso=20240321T02&p1=1440&ah=22)
* Day 2: [March 22, 02:00 GMT — March 22, 24:00 GMT](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Japanese+Olympiad+in+Informatics+%28JOI%29+Spring+Camp+2024+Day2&iso=20240322T02&p1=1440&ah=22)
* Day 3: [March 23, 02:00 GMT — March 23, 24:00 GMT](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Japanese+Olympiad+in+Informatics+%28JOI%29+Spring+Camp+2024+Day3&iso=20240323T02&p1=1440&ah=22)
* Day 4: [March 24, 02:00 GMT — March 24, 24:00 GMT](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Japanese+Olympiad+in+Inf...
The registration page and live scoreboard will be announced 10 minutes before
the contest.
32.
How to use Codeforces [GUIDE] I see a lot of newcomers struggling to use the website to it's fullest, so I decided to write a blog that has all important information about how to use Codeforces in a single place. I will update it with time, so feel free to write your suggestions/questions in case I missed something and I will be glad to add it to the post!
I would like to thank [user:_Vanilla_,2022-02-05] and [user:mesanu,2022-02-05] for helping me write the blog, and [user:Monogon,2022-02-05], [user:down,2022-02-05] and [user:AlperenT,2022-02-05] for proofreading and giving suggestions.
#### Navigating through pages
It's possible to navigate through most pages of Codeforces using the bar on the top, I will talk about what each tab does more in depth below:
#### The Help Page
The help page contains the answer to a lot of questions about Codeforces, such as rati...
of users who follow you (AKA friends), a change settings button, details about
theregistration on, prompted to specify the registration policy, based on which members can join
it.
33.
OCPC 2026 Summer Hi everyone!
<center><a href="https://ocpc.camp"><img src="https://ocpc.camp/images/ocpc_light.svg?nocache" height="80px"></a>
<a href="https://icpc.foundation/"><img src="https://ocpc.camp/images/ICPC.svg?nocache" height="80px"></a></center>
The [OCPC](https://ocpc.camp/) (Osijek Competitive Programming Camp), an [award-winning](https://www.linkedin.com/feed/update/urn:li:activity:7368330111089131522/) camp for university students preparing for ICPC and other coding competitions, is back this **Summer 2026** — this time with **two onsite editions**:
- **Hong Kong** — **8–16 August 2026**, hosted at the City University of Hong Kong.
- **Iași, Romania** — **12–20 September 2026**, hosted at Alexandru Ioan Cuza University of Iași.
Both editions are organized by us together with local hosts at each site, and use the **same contest set** — so you take part in **one** of them. As a rough guide, the **Iași** edition is most convenient for teams based in Europe, and **Hong Kong*...
### Registration, Registration closes **two weeks** before each edition's start for **onsite**
teams and **one week, The registration form is **[here](https://forms.gle/FGPh3uivqHwcqhiN7)**; you
pick your location, registration form).
34.
2nd Universal Cup. Stage 6: Warsaw Hello Codeforces! I wanted to invite you to participate in the 6th Stage of the 2nd Universal Cup, which will be held from October 21st to 22nd.
The contest is made of problems from the finals of Potyczki Algorytmiczne (a.k.a. Algorithmic Engagements) from the last couple of years, which is the biggest open polish programming competition. There will be two such contests held as Universal Cup stages and in the upcoming weekend you'll be able to face the first of them.
If you participated in any of the PA2020, PA2021, PA2022 or PA special edition **finals**, or happen to know the problems, please don't compete in this contest.
Problems used in the upcoming contest are authored by me and [user:mnbvmar,2023-10-16]. Also a huge round of applause for [user:kostka,2023-10-16], who helped a lot in organization of each edition of PA, coordinated this contest and translated all the statements!
You can participate in the contest in the following time windows:
- 02:00 (UTC) on S...
Register a new team: https://ucup.ac/register (the registration request will be
processed before
35.
My CP Course "Zero to Hero" is now open for pre-registration! Having had a ton of experience with CP, I have decided that I could share my knowledge the best with the world by making a course! This course currently has lessons designed for people of many levels, from newbies to low masters.
Currently, I have opened pre-registration. I'm currently just trying to get an idea of how many people would be interested in such a course (and also to catch possible bugs on the website).
Here is the course website: http://course.williamlin.io/
100 lucky winners who pre-register will be given beta access to the course for free! Pre-registration won't be open for long though, so be sure to do it quick!
**Update:**
Thanks to every who pre-registered! The pre-registration assessment proved to be tough, and we decided to offer spots for beta access even for those who did not pass the test! Look out for an email from [email protected] for your decision letter, as well as solutions and more opportunities to gain beta access to the course!
**Up...
My CP Course "Zero to Hero" is now open for pre-registration!, , from newbies to low masters. Currently, I have opened pre-registration. I'm
currently just, -registration won't be open for long though, so be sure to do it quick!, Currently, I have opened pre-registration. I'm currently just trying to get an
idea of how many, Thanks to every who pre-registered! The pre-registration assessment proved to
be tough, and we
36.
Free Classes for Palestinian and Lebanese Coders It has been a year since our brothers and sisters in Palestine have been dying and watching their families die. With the war in Lebanon also unfolding, I wondered what I could do.
<br>
We, Algoritmi Academy, want to do **the least** we can to support people there. We sincerely apologize for not acting sooner.
<center>
<img src="/predownloaded/0b/dd/0bddd0d56ad33fb2979a34bab5ece9fb076d4d68.jpg" width="40%">
</center>
Starting now, we will hold **free weekly classes** for Palestinian and Lebanese coders. Our priority will be those preparing for IOI and ICPC, but we may accept coders preparing for other goals.
To participate, register on our [website](https://algoritmiacademy.com/) and select group classes.
Our activities are not limited to one class per week; we’ll also have a monthly contest. If the number of participants grows, we’ll make two divisions to better maintain the level. For those who may struggle with English, mention it in your registration form; we may hol...
struggle with English, mention it in your registration form; we may hold some
classes in Arabic, too., the level. For those who may struggle with English, mention it in your
registration form; we may
37.
OCPC 2025 Winter Singapore Mirror Camp (22-26 Feb) Hi everyone!
<center><img src="https://ocpc.camp/images/ocpc.svg" height="100px"></center>
For the [Winter 2025 edition of the Osijek Competitive Programming Camp (OCPC)](https://codeforces.me/blog/entry/138091), we are working with the [National University of Singapore (NUS)](https://www.nus.edu.sg/) to host a mirror of the OCPC in **Singapore**, during **22-26 Feb 2025**. The mirror will consist of 4 training contests, that are a subset of the main 7 contests of OCPC (scheduled for 15 Feb-23 Feb 2025 in Osijek, Croatia and online).
The contest days will be on 22, 23, 25 and 26 Feb, and 24 Feb will be a rest day. The mirror takes place right before [ICPC APAC Championship 2025](https://apac.icpc.global/), scheduled for 27 Feb-2 Mar, and is a good training opportunity for its participants. Please note that the mirror is a private initiative of NUS and OCPC, and is not an official part of the ICPC event.
If you want to get a feel of the contests, refer to [this comment](h...
### Registration
38.
Congratulations to the winners of the 2nd Universal Cup Semifinal! We’re excited to share that the **Universal Cup Summer Summit 2024**, sponsored by Huawei, just wrapped up in the beautiful Cancun, Mexico!
The highlight of the event was the 2nd Universal Cup Semifinal, where 200 teams competed both onsite and online.
A huge shoutout to all our onsite teams:
**Gold Medal**
* USA1 ([user:ecnerwala,2024-06-25], [user:ksun48,2024-06-25], [user:tourist,2024-06-25])
**Silver Medal**
* Polish Mafia ([user:Swistakk,2024-06-25], [user:Radewoosh,2024-06-25], [user:Marcin_smu,2024-06-25])
**Bronze Medal**
* HoMaMaOvO ([user:maroonrk,2024-06-25], [user:maspy,2024-06-25], [user:hos.lyric,2024-06-25])
**Honourable Mention**
* 03 Slimes ([user:orzdevinwang,2024-06-25], [user:Rewinding,2024-06-25], [user:TLE,2024-06-25...
/. If you’re interested in participating this season, head over to the [
Registration page](https
39.
Introducing Arugo — A website that provides virtual rating while practicing on problemset Hello Codeforces users.
Today I would like to introduce [Arugo](https://arugo.herokuapp.com/), which is a website that provides virtual rating while practicing on problemset.
On this website, you can practice problems that are suggested through a suggestion system or by your custom choice. Each problem has a window of 80 minutes to solve and if you manage to solve it in time, please validate and you will earn virtual rating. However, if you gave up early or time runs out, you will lose rating eventually. Rating progress will be displayed at the homepage through a graph like in Codeforces and through it, you can visualize your progress and stay motivated to keep going.
<spoiler summary="Rating progress preview">
</spoiler>
<spoiler summary="Challenge preview">
</spoiler>
This site is inspired by my past t...
registration process. I had it patched for now.
40.
JOI Final Stage 2026 Online Contest Hello, everyone!
**Japanese Olympiad in Informatics (JOI) Final Stage 2026 ([Contest URL](https://contests.ioi-jp.org/joi-final-2026/index-en.html))** will be held from March 21st to 24th. There are 4 days in the contest. Note that the Final Stage is a kind of IOI selection camp, which is equivalent to Spring Training in 2025 or before.
* Day 1: [March 21, 02:00 GMT — March 21, 24:00 GMT](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Japanese+Olympiad+in+Informatics+%28JOI%29+Spring+Camp+2026+Day1&iso=20260321T02&p1=1440&ah=22)
* Day 2: [March 22, 02:00 GMT — March 22, 24:00 GMT](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Japanese+Olympiad+in+Informatics+%28JOI%29+Spring+Camp+2026+Day2&iso=20260322T02&p1=1440&ah=22)
* Day 3: [March 23, 02:00 GMT — March 23, 24:00 GMT](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Japanese+Olympiad+in+Informatics+%28JOI%29+Spring+Camp+2026+Day2&iso=20260322T02&p1=1440&ah=22)
* Day 4: [Mar...
The registration page and live scoreboard will be announced 10 minutes before
the contest.
41.
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) — $1500
2. [user:tourist,2025-05-09] (400, 05:50:33) — $1000
3. [user:benq,2025-05-09] (340, 05:41:11) — $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. ...
Registration is open at https://mitit.org/Registration, and we have started
reviewing and accepting
42.
Rayan 2025 World Finals **👋 Salam, Codeforces!**
------------------
We are excited to announce that the final round of the **Rayan Programming Contest** will be held **onsite in Tehran**, from **November 25–29, 2025**!
All participants ranked **1-1000** in the [Rayan Selection Round](https://codeforces.me/contest/2034/standings) are invited to complete the [registration form](https://rayan.global/registration/) by <s>August 25, 2025</s> **August 27, 2025**. The final list of invited participants—selected based on rank and geographical diversity—will be announced shortly thereafter.
Beyond the chance to win **top-tier prizes worth $40,000 USD**, finalists will enjoy a unique opportunity to experience the timeless beauty and rich heritage of **ancient Persia**, with special highlights from the vibrant city of [Tehran](https://rayan.global/gallery/tehran-attractions/).
<img src="https://rayan.global/files/Golestan-Palace.jpg" style="width: 100%;">
**Hotel accommodation, local transportat...
43.
[CONTEST OVER] MIT Informatics Tournament (M(IT)^2) 2024 **UPDATE 3**: There was a typo in the registration link that led to the pre-registration form. If you filled that out, please fill out our actual [registration form](https://mitit.org/Registration). Note that with the contest **within 24 hours**, we cannot guarantee we review all applications in time. Please submit ASAP if you would like to be considered. Apologies for the inconvenience.
**UPDATE 2: The contest is in less than a week! Note that we changed the venue from the MIT Media Lab to [Huntington Hall (10-250)](https://whereis.mit.edu/print_window.html?zoom=16&lat=42.359674020000014&lng=-71.09201372&maptype=mit&q=10-250&open=object-10). There will be thousands of dollars in cash prizes and also exclusive merchandise!**
The schedule for contest day is below. We are excited to see everyone!
- **8 AM — 9 AM:** Contestants check-in + breakfast
- **9 AM — 10 AM:** Opening Ceremony + Last minute team formation
- **10 AM — 10:30 AM:** Buffer time as teams ar...
**UPDATE 3**: There was a typo in the registration link that led to the pre-
registration form. If, **UPDATE: The contest date and location have been finalized and registration is
now open!** Find, For more information, check out [our website](http://mitit.org), and [
registration](https
44.
[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...
reimbursements for travel and lodging. Registration is open at
[https://mitit.org/Registration, Registration is open at [https://mitit.org/Registration](https://mitit.org/
Registration), and we
45.
Codeforces: Results of 2013 Hello! Do you feel the breath of New Year?
<img src="http://assets.codeforces.com/images/tree.png" style="float:right;margin: 0 1em 1em 1em;"/>
The clock shows a day before New Year, so it is time to sum up the past. I do not have speech-writers for words in the style of
"what recently seemed almost impossible, it becomes a fact of life" so I'll be short. Thank you all! Your unfading interest and
constant help inspire Codeforces team for new achievements! Brilliant writers, invisible soldiers: testers, tireless and greedy
for knowledge participants — all of you help Codeforces do better!
I've dug into the records and made a partial list of the most notable major improvements of 2013. Some large improvements of our
infrastructure are not in the list, as the community can not see them directly.
* A simple way to add contest from [Polygon](https://polygon.codeforces.com/) to Codeforces::Gym.
* Drafts embedded in text form fields in Codeforces and Polygon.
* Multipl...
46.
Introducing CF Stonks — A Virtual Stock Market Based on Your CodeForces Rating! **2/11/2023 Update**: There had been a month-long hiatus due to the CF name change magic (and my own laziness oops), but everything has been fixed now :D! However, I know a lot of people have gone inactive due to the month-long market closure, so I am hoping to **relaunch StonksCF** in the near future with some new mechanisms (dividends, automatic algorithm trading, etc.). Let me know if you have any ideas! In the meantime, feel free to continue exploiting the way-over-inflated economy and embrace your inner capitalism >:D
**Final Update**: We now have our own **DISCORD SERVER**. Join us for the latest information and engage with the community at [https://discord.gg/AeH2GTwkF5](https://discord.gg/AeH2GTwkF5) All the announcements will be there instead of on this page
Greetings Fellow CodeForces users!
I am proud to introduce my latest project, [CF Stonks](https://codetiger.me/project/StonksCF) (aka StonksCF), which is a virtual stock market based on your CodeForces rating.
...
rest of the $800$ being sold on the market) and $10,000$ in cash upon
registration. The price of
47.
The 3rd Universal Cup Announcement (with Details of Upcoming Online and Onsite Event on June 23!) <center>
<img src="/predownloaded/a6/3b/a63b8b0dc4b18f3e18c316abc22d4677aa075fd8.png" style="height: 262.0px;max-width: 100.0%;max-height: 100.0%;">
</center>
Hello everyone, we are happy to announce that the 3rd Universal Cup has started officially. Universal Cup is an organization dedicated to offering training resources for competitive programming teams. In the previous season, over 900 teams from more than 500 affiliations all over the world, registered and participated in a total of 28 stages, encompassing contests from Asia, Europe, and America. We also want to express our gratitude to our sponsor [Huawei](https://codeforces.me/blog/entry/122510).
- Semifinal and Summer Summit
---------------------------
As announced before ([Link](https://codeforces.me/blog/entry/127295)), we will host the 2nd Universal Cup Semifinal on June 23, 2024. The contest will start at 17:00 (UTC +8) and end at 22:00 (UTC +8).
**Any Universal Cup registered team can participate. If you are...
following the instructions on [Registration
](https://universal-cup-website.qoj.ac/register?season=2)., the instructions on** [Registration
](https://universal-cup-website.qoj.ac/register?season=3)., , the same as new teams, please register following the instructions on [
Registration](https
48.
2nd Universal Cup Semifinal — Online Version This weekend, we will host the 2nd Universal Cup Semifinal. Unlike with previous Universal Cup rounds, there will be exactly one window that all teams will participate in. This window will be from [5pm to 10pm UTC+8 on Sunday, June 23rd](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Universal+Cup+Semifinals+%28Online%29&iso=20240623T17&p1=3910&ah=5). Note that this window is after the onsite version.
**Any Universal Cup registered team can participate. If you are new here, please register following the instructions on** [Registration](https://universal-cup-website.qoj.ac/register?season=3).
<center style="margin: 2.5em;">
<a href="https://universal-cup-website.qoj.ac/register?season=3" style="text-decoration: none;font-size: 24.0px;background-color: rgb(140,40,60);color: white;font-weight: bold;padding: 0.5em 1.0em;">Register!</a>
</center>
Besides competing to advance to the Universal Cup Finals, sponsored by Huawei, we have also prepared prizes for teams in the...
the instructions on** [Registration
](https://universal-cup-website.qoj.ac/register?season=3).
49.
Codeforces: Domains For Groups Hello!
Are you missing something new? I have something to please you.
Regularly I host some events — Olympiads, onsites, and eventually, examinations and tests for students. On the one hand, Codeforces already offers a unique functionality — groups, the integration with Polygon, the possibility of choosing tasks from the archive and so on. But it doesn’t enough!
### Domains for groups
Here is an example of such a group. It is open for all — join it and look: http://example.contest.codeforces.com
##### Domain
Now when you are editing a group, you can specify its subdomain (from 3 to 20 alphanumeric characters, starts with a letter). When you specify the domain, the group will be accessible by a link http://yourgroupdomain.contest.codeforces.com. According to this link, the following is correct:
* Nothing extra will be displayed — the site contains only the information about competitions and blogs of your group and nothing else.
* A...
Codeforces account, the information about participants comes from a separate
registration, and you, ''). * Allow self-registration — whether it is possible for participant to make
a self
50.
Good Bye 2016 sponsored by Barcelona ACM-ICPC Camp Hello everybody!
On December 30 at 14:05 UTC/17:05 MSK ([check your time zone here](http://timeanddate.com/worldclock/fixedtime.html?day=30&month=12&year=2016&hour=17&min=5&sec=0&p1=166)) Codeforces will host the New Year's contest Good Bye 2016.
The contest is combined for both divisions, lasts 2.5 hours and contains 8 problems.
Thanks to <a href="http://harbour.space/">Harbour.Space</a> and <a href="http://in.harbour.space/icpc/"> Barcelona ACM-ICPC Programming Bootcamp 2017</a> sponsoring the contest, winners can expect really cool prizes:
- 5 best participants (not ACM ICPC veterans) will win free participation in Hello Barcelona programming bootcamp.
- 30 best participants (not ACM ICPC veterans) will receive a 30% discount for participation in Hello Barcelona programming bootcamp.
- 100 best participants will receive t-shrits by organizers and Codeforces.
<center>
<img src="http://codeforces.me/predownloaded/dd/0f/dd0fbc52ada73fb48011ce52adee739a248fa804.png"/>
</...
. The registration is open up to **January 20th, 2017**.
Announcement of Good Bye 2016
51.
Montgomery Blair Informatics Tournament 2021 Spring Round (Registration live!) **Competitors can join our Discord server [here](https://discord.gg/CuWRkC8pG5)**.
The [Montgomery Blair HS Computer Team](https://www.mbhscompteam.org/) is proud to present the fourth iteration of the semi-annual **Montgomery Blair Informatics Tournament (mBIT)**, which will be held online from [10:00 AM — 2:00 PM EDT](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Montgomery+Blair+Informatics+Tournament+%28mBIT%29+2021+Spring+Round&iso=20210612T10&p1=263&ah=4) on **Saturday, June 12 (6/12/21)**. If you are interested in competing, please register at https://mbit.mbhs.edu/. The contest will be hosted on our personal servers at https://mbit.live/. All problems were written by the Montgomery Blair Computer Team, including [user:12tqian,2021-01-01], [user:gabrielwu,2021-04-01], [user:galen_colin,2021-05-14], [user:smax,2021-05-14], [user:meiron03,2021-05-14], [user:Blastman,2021-05-14], [user:alien_lover,2021-05-14], [user:czhang2718,2021-06-05], and [user:csytrn,2021...
Montgomery Blair Informatics Tournament 2021 Spring Round (Registration live!), ](https://mbit.mbhs.edu/)**. Registration will remain open up until the day of
the contest.
52.
Lexington Informatics Tournament 2022 (Registration Open!) **Participants can join our Discord server [here](https://discord.gg/k6yzFdZ)**
The [LexMACS](https://lhsmathcs.org/) (Lexington Mathematical CS) club is proud to announce our third annual **Lexington Informatics Tournament 2022**! The contest window lasts from [July 21 — July 25 EDT](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Lexington+Informatics+Tournament+%28LIT%29+2022&iso=20220721T16&p1=263), and participants can begin their **3 hours** window at any time. If you are interested, please visit our website at [https://lit.lhsmathcs.org/](https://lit.lhsmathcs.org/). Once you register, you can see all the past problems on the contest page. Some of our problem-setters include [user:codetiger927,2022-07-11], [user:eggag32,2022-07-11], [user:superj6,2022-07-11], and [user:eyangch,2022-07-11]. Special thanks to testers [user:DreamingLeaf,2022-07-11], [user:Tlatoani,2022-07-15], [user:fishy15,2022-07-19], [user:fivefourthreeone,2022-07-19] as well!
LIT consists of tw...
Lexington Informatics Tournament 2022 (Registration Open!), /k6yzFdZ) and visit our [Website](https://lit.lhsmathcs.org/)**. Registration
will remain open up until, ://lit.lhsmathcs.org/)**. Registration will remain open up until the end of the
contest window. If you have any
53.
MIT Informatics Tournament 2026-27 Winter Contest Please join our **[Discord server](https://discord.gg/WPhngGjWhC)** for the latest updates!
Hello Codeforces!
We ([user:anango,2026-10-28], [user:bensonlzl,2026-10-28], [user:79brue,2026-10-28], [user:Boomyday12343,2026-10-28], [user:eternal1422,2026-10-28], [user:ewirlan,2026-10-28], [user:for_clarifying,2026-10-28], [user:Feet_McYeet,2026-10-28], [user:jer033,2026-10-28], [user:jay_jayjay,2026-10-28], [user:jatloe,2026-10-28], [user:MinaRagy06,2026-10-28], [user:MtSaka,2026-10-28], [user:Mingyu331,2026-10-28], [user:RecursiveCo,2026-10-28], [user:SHZhang,2026-10-28], [user:_sadhamster_,2026-10-28], [user:zhoukangyang,2026-10-28]), current students at MIT, are excited to announce that **registration is now OPEN** for the **MIT Informatics Tournament 2026–27 Winter Contest (M(IT)²)**!
The contest will take place on **Sunday, December 6, 2026**, both in person at MIT and online.
**Registration link**: https://mitit.org/Registration
**M(IT)²** is a full-day competitive pro...
that **registration is now OPEN** for the **MIT Informatics Tournament 2026–27
Winter Contest (M(IT, **Registration link**: https://mitit.org/Registration, The registration deadline is **November 22** for the in-person competition and
**November 29** for, ], [user:zhoukangyang,2026-10-28]), current students at MIT, are excited to
announce that **registration
54.
OMORI CONTEST Announcement Assalamualaikum (peace be upon you), Codeforces people 👋.
I'm glad to invite you to the mashup [OMORI CONTEST](https://codeforces.me/contestInvitation/fc8da6d6845e77adc452e754d3d84c1086148c59) which will be held inshallah on [Thursday, October 17, 2024 at 19:30 (GMT+3)](https://www.timeanddate.com/worldclock/fixedtime.html?iso=20241017T1930&p1=426).
You will be given **3.5 hours (210 minutes)** to solve **7 cool problems** in an **ICPC-styled** contest, themed about the videogame [OMORI](https://www.google.com/search?q=omori) (Which is a great game that you might want to give a try). There will be exactly one interactive problem, so I suggest you should read the [guide for interactive problems](https://codeforces.me/blog/entry/45307).
All problems have been written and prepared by me, [user:Hexagons,2024-10-04].
I would like to give a lot of thanks to:
- [user:MikeMirzayanov,2024-10-04] for the great codeforces and polygon systems 👍, without them I wou...
register button just like registering for any normal CF round (But the
registration is currently closed, **Update 2:** [Registration](https://codeforces.me/gymRegistration/551481) has
started!
Announcement of OMORI CONTEST
55.
Codeforces Round #456 (Div. 2) _Hey, Codeforces!_
Hope that the last few days were quite productive for all of you in terms of rest and pleasure. Time to forget about messing with handle colors and get back to coding!
I'm proud to usher the first contest of the year — Codeforces Round #456, which is going to be held [on Friday, 17:35 MSK](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Codeforces+Round+%23426+%28Div.+2%29&iso=20180105T1735&p1=352&ah=2).
The round will be **rated** for all division 2 participants. Anyway, we will be glad to see whoever decides to join us out-of-competition :)
The authors are — [user:GreenGrape, 2018-01-01] and [user:rek, 2018-01-01] (don't worry, it's all about New Year magic ^^). My heartfelt gratitude to Kolya ([user:KAN, 2018-01-01]) for his invaluable help in round coordination, Grisha ([user:gritukan, 2018-01-01]) and Oleg ([user:x3n, 2018-01-01]) for testing and correcting statements, Dima ([user:cdkrot, 2018-01-05]) and Gleb ([user:glebodin, 2018-01-...
**UPD.** Please note that the registration was delayed for a few hours.
56.
Rockethon 2015 Announcement <a href="http://rocketfuel.com/"><img src="http://assets.codeforces.com/images/rockethon/HZ-LOGO-TAG-RGB-big.png" style="float:right;margin:0 2em 2em 2em;"/></a>
Hello Codeforces community,
I am happy to announce that [Rocket Fuel Inc.](http://rocketfuel.com/) will be hosting a Rockethon competition again! The contest is prepared by Rocket Fuel employees Eldar Bogdanov, Anton Lomonos, Lasha Lakirbaia, Alexander Ruff, Nikhil Goyal and me, Ievgen Soboliev. We hope everyone will find some interesting problems in the contest and everyone will have as much fun solving these problems as we had preparing them. Just like last year, the best participants will receive valuable prizes and top performers will get Rockethon 2015 T-shirts! Also, Rocket Fuel is interested in hiring people after this event, so please fill out the simple form during registration.
About Rocket Fuel
---------------------
Rocket Fuel is building technology platform to do automatic targeting and optimization of a...
after this event, so please fill out the simple form during registration.
57.
The 1st Universal Cup. Stage 13: Iberia Hello Codeforces! The 13th Stage of the 1st Universal Cup is coming. It will be held from April 22nd to 23rd.
This contest was first used in the Petrozavodsk Programming Camp Winter 2023, and also appeared in the 2023 ICPC Training Camp powered by Huawei and the Hello Muscat 2023 Bootcamp. If you participated in any of those, you should not participate in this stage of the Universal Cup.
All the problems were authored and prepared by [user:998batrr,2023-04-21], [user:244mhq,2023-04-21], [user:353cerega,2023-04-21] (Harbour.Space [P+P+P](https://codeforces.me/team/102621), Barcelona, Spain) and [user:Um_nik,2023-04-21] (Lisbon, Portugal).
We want to thank the Universal Cup Committee for staying true to the spirit of 5h/3person/1pc contests and for providing the opportunity to share our contest with a wider audience.
As usual, we have three time windows for participating. You can participate in the contest in the following three time windows:
[Time Window 1: April 22nd 13...
Register a new team: https://ucup.ac/register (the registration request will be
processed before
58.
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 — 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...
in this season. We also managed to implement a registration webpage and host
all kinds of contests
59.
Registration for Derive 2026 is open! Greetings, Codeforces Community!
================================
We, at the **[AMS](https://amsociety.in/) (Algorithms & Mathematics Society)** are excited to invite you to **Derive 2026**, a three-round quant and mathematical reasoning circuit, sponsored by **Jane Street**. We already have crossed 2000 registrations across top universities.
The idea behind Derive is simple: no templates. Every problem is built around the math that quant firms actually test for (probability, stochastic processes, combinatorial games), and you have to derive the answer from first principles.
---
**Contest Format**
--------------
**Round 1 | PRIOR | May 23 | Online (Codeforces) :**
This is standard CP but with a lot more quantitative depth. We're pushing expected value, martingales, and game theory harder than usual rated rounds. If you like Putnam-style math or ICPC math ad-hocs, you'll enjoy this. The top performers move on.
**Round 2 | POSTERIOR | Online(Codeforces) :**
Still on C...
Registration for Derive 2026 is open!, to be announced. Registration and participation are completely free., #### **Registration**, . Registration and participation are completely free. --- #### **Prizes and
Recognition** We
60.
JOI Spring Training 2025 Online Contest Hello, everyone!
Japanese Olympiad in Informatics (JOI) Spring Training 2025 ([Contest URL](https://contests.ioi-jp.org/joi-sp-2025/index-en.html)) will be held from March 21st to 24th. There are 4 days in the contest.
* Day 1: [March 21, 02:00 GMT — March 21, 24:00 GMT](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Japanese+Olympiad+in+Informatics+%28JOI%29+Spring+Camp+2025+Day1&iso=20250321T02&p1=1440&ah=22)
* Day 2: [March 22, 02:00 GMT — March 22, 24:00 GMT](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Japanese+Olympiad+in+Informatics+%28JOI%29+Spring+Camp+2025+Day2&iso=20250322T02&p1=1440&ah=22)
* Day 3: [March 23, 02:00 GMT — March 23, 24:00 GMT](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Japanese+Olympiad+in+Informatics+%28JOI%29+Spring+Camp+2025+Day2&iso=20250322T02&p1=1440&ah=22)
* Day 4: [March 24, 02:00 GMT — March 24, 24:00 GMT](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Japanese+Olympia...
The registration page and live scoreboard will be announced 10 minutes before
the contest.
61.
CodeCraft-17 and Codeforces Round #391 (Div. 1 + Div. 2, combined) Announcement Hello Everyone!
I would like to invite you to CodeCraft-17, which will take place on [Thursday 12th January 2017, 9:05PM IST](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CodeCraft-17&iso=20170112T1535&p1=1440&ah=3). The round will be a Div1 + Div2 combined round and is **rated**.
[Felicity, IIIT Hyderabad](https://www.facebook.com/felicity.iiith) presents [Threads ‘17](https://felicity.iiit.ac.in/threads/), the magnificent annual technical fest, is finally here in its 13th edition! With a plethora of intellectually engaging online contests in various fields of programming, mathematics and general knowledge, Threads is a celebration of the spirit of computing and engineering. The grand algorithmic sprint called **CodeCraft**, parallel programming in **Kernel Cruise**, mathematical enigmas in **Gordian Knot**, jeopardy style CTF event called **Break In**, overall Threads '17 has something to offer for every kind of computing enthusiast!
![Codecraft Poster ](...
**UPD: The constraint of registration for eligibility to prizes has been
removed. Everyone who
62.
Codeforces Groups <img src="http://assets.codeforces.com/images/groups/group.jpg" style="float:right; margin: 0 1em 1em 1em;"/>
Hello, Codeforces!
Today I would like to tell you about new Codeforces feature: about groups. Now you can create a group , invite people into it, add members to group and organize contests inside a group.
### Create a Group ###
Only Div.1 coders can create a group. Good reason to increase rating, right? If you have rights to create a group on the Groups page, it will be a special link. Except name, you can specify:
* description (feel free to use simple HTML)
* logo: it will shine on each group’s page!
* related to group website URL
[cut]
<center><img src="http://assets.codeforces.com/images/groups/new-group-en-75.png" style="border:1px solid gray;margin-top:1em;"/></center>
### Visibility ###
There are public and private groups. Public groups are visible to all users and private are visible only to members of the group.
Public groups can...
group. * Moderated registration is also called “by confirmation” — any person
will be able to, ### Registration Policy ###, There are three possible policy values: open enrollment, moderated registration,
registration by
63.
Yandex.Algorithm 2017 We are announcing the annual Yandex.Algorithm 2017 championship! This is a great opportunity to compete with the strongest programmers of the world, win a fancy T-shirt, visit Yandex office or even receive some serious money prize.
<br />
[cut]
<center><h3><a href="https://contest.yandex.com/algorithm2017/schedule/">Complete schedule</a></h3></center>
In order to take place in the main part of the competition you must participate in at least one of the Warm-Up round ([April 22nd, 16:00 Moscow Time](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Yandex.Algorithm+2017+Warm-up+round&iso=20170422T16&p1=166&ah=1&am=40)) and Qualification round ([April 29nd or 30th, virtual participation](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Yandex.Algorithm+2017+Qualfication+round&iso=20170429T00&p1=166)) and solve at least one problem in some of them.
...
Internship Track of the competition (by choosing the corresponding option in
theregistration form). The, **UPD (Apr 11th)**: Registration works fine now., Registration is open till the end of qualification round. See you in the
competition! :)
64.
Rayan 2024 Selection Round (Div. 1 + Div. 2, Rated, Prizes!) 👋 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.
...
, 2025, in Arpa’s [blog](https://codeforces.me/blog/entry/145677). For
registration, schedule, and
65.
ZeptoLab Code Rush 2014 <img src="http://assets.codeforces.com/images/zepto2014/image06.png" style="width:190px;float:right;margin:0 1em 1em 1em;"/>
A coder can apply his breathtaking coding skills not only in different search engines but also in the mobile game industry. It is an option in Russia. If you do not believe — check this out: ZeptoLab company that created the world famous Cut the Rope game offers you the opportunity to see this for yourself. And yes, we are in Moscow.
It's not a secret that those who strive to achieve top coding skills — work hard, including work on his self-education. Here in ZeptoLab we aim to create the area that strongly encourages self-development. Specifically, we have recently purchased a company library with everything necessary to get new knowledge, an improvised reading room with sofas and armchairs.
<center>
<img src="http://assets.codeforces.com/images/zepto2014/image08.jpg" style="width:400px;"/>
</center>
We also conduct developer's contest ...
team, tick the corresponding square at the registration.
Announcement of Zepto Code Rush 2014
66.
3rd Universal Cup. Stage 2: Zielona Góra Hello Codeforces! I wanted to invite you ([just like last time](https://codeforces.me/blog/entry/121447)) to participate in the 2nd Stage of the 3rd Universal Cup, which will be held from June 15th to 16th.
The contest is made of problems from the finals of Potyczki Algorytmiczne (a.k.a. Algorithmic Engagements) from the last couple of years, which is the biggest open polish programming competition. Two such contest were created, one of them was held last season and in the upcoming weekend you'll be able to face the second of them.
If you participated in any of the PA2020, PA2021, PA2022 or PA special edition **finals**, or happen to know the problems, please don't compete in this contest. Also note, that this contest was previously used on OCPC 2024 Winter, so if you participated in this camp, please don't compete now.
Problems used in the upcoming contest are authored by me, [user:Asymmetry,2024-06-13], [user:Marcin_smu,2024-06-13], and [user:monsoon,2024-06-13]. Also a hug...
Register a new team: https://ucup.ac/register (the registration request will be
processed before
67.
3rd Universal Cup. Stage 40: Potyczki Hello Codeforces! Are you ready for the third Universal Cup stage made of problems from Potyczki Algorytmiczne? I hope so, because during the next weekend (21.06-22.06) you will have a chance to participate in it!
Please note, that this is the last stage in this season and your last chance to participate!
The contest, just like the previous two ([1](https://codeforces.me/blog/entry/121447), [2](https://codeforces.me/blog/entry/130436)), is composed of problems from the finals of Algorithmic Engagements, the biggest polish open programming competition. If you happen to know the problems from the last two finals, please don't participate in this stage.
Problems used in the upcoming contest were authored by me ([user:Radewoosh,2025-06-19]), [user:Marcin_smu,2025-06-19], [user:tribute_to_Ukraine_2022,2025-06-19], [user:fwitt,2025-06-19], [user:onufryw,2025-06-19], [user:mnbvmar,2025-06-19] and [user:Markadiusz,2025-06-19].
You can participate in the contest during the standar...
Register a new team: [https://ucup.ac/register](https://ucup.ac/register) (the
registration request
68.
Lexington Informatics Tournament 2021 (Registration Open!) **Participants can join our Discord server [here](https://discord.gg/k6yzFdZ)**
The [LexMACS](https://lhsmathcs.org/) (Lexington Mathematical CS) club is proud to announce our second annual **Lexington Informatics Tournament**! The contest window lasts from [July 15 — July 19 EDT](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Lexington+Informatics+Tournament+%28LIT%29+2021&iso=20210715T11&p1=263), and participants can begin their **3 hours** window at any time. If you are interested, please visit our website at [https://lit.lhsmathcs.org/](https://lit.lhsmathcs.org/). Once you register, you can see all the past problems on the contest page. Some of our problem-setters include [user:codetiger927,2021-07-02], [user:eggag32,2021-07-16], [user:superj6,2021-07-02], and [user:eyangch,2021-07-02]. Special thanks to testers [user:DreamingLeaf,2021-07-15] and [user:plourde27,2021-07-15] as well!
LIT consists of two separate rounds: **Standard** and **CTF**. Teams may participa...
Lexington Informatics Tournament 2021 (Registration Open!), ) and visit our [Website](https://lit.lhsmathcs.org/)**. Registration will
remain open up until the, /k6yzFdZ) and visit our [Website](https://lit.lhsmathcs.org/)**. Registration
will remain open up until
69.
OCPC 2026 Winter — wrap _If you are potentially interested in participating in OCPC **in person** in Summer/Autumn 2026, **please** fill **[this form](https://forms.gle/VdMRh6cAJRN4YvQN6)**!_
Hi everyone!
<center><a href="https://ocpc.camp"><img src="https://ocpc.camp/images/ocpc_light.svg" height="80px"></a>
<a href="https://icpc.foundation/"><img src="/predownloaded/43/08/43086529a28ccb5c9f2f2eec560ffa85e09c6881.svg" height="80px"></a></center>
<center>
<b>Supported by</b><br>
<a href="https://www.janestreet.com/join-jane-street/open-roles/?type=students-and-new-grads&location=london">
<img src="/predownloaded/ee/f2/eef26616a3661c658d1545f18ed21fabb14d5871.svg" height="40px" style="margin: 10px 10px 10px 10px;"></a>
<a href="https://www.hudsonrivertrading.com/">
<img src="https://ocpc.camp/images/HRT.svg" height="40px" style="margin: 10px 10px 10px 10px;"></a>
<a href="https://www.silares.com/">
<img src="https://ocpc.camp/images/silares-red.svg" height="40px" style="margin: 10px 10px 10px ...
camp, and then not responding to our emails _at all_ (not even canceling the
registration), often
70.
The 2025 Universal Cup Online Challenge is Happening Soon! <center>
<img src="/predownloaded/43/f6/43f69acd4c854a20d5f7064fe6252b346f9f5d5a.png" style="height:262.0px;max-width:
100.0%;max-height: 100.0%; ">
</center>
**UPD: The [contest platform](https://challenge.ucup.ac/) is up! Everyone can now register through the platform!!!!**
**UPD: The champion will be invited as a guest (with full accommodation and travel expense covered) to the 2026 Universal Cup Finals. The champion will be awarded at the time and will be invited to participate in the onsite challenge.**
Hello Codeforces!
We are very happy to announce that, after months of preparation, we have finally scheduled our first online challenge from December 17th to December 24th! Sponsored by Huawei, we have prepared valuable prizes for everyone to compete for! Although many details are still to be finalized, we are too excited to share the following details with you as an early Christmas gift!
- Contest Name (Subject to Change): The 2025 Universal Cup Online Challenge...
. The registration details will be announced in early December. We will be
posting another blog (on
71.
Educational Codeforces Round 145 [Rated for Div. 2] Hello Codeforces!
On [contest_time:1809] [contest:1809] 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,2023-03-19] Dalabaev, Ivan [user:BledDest,2023-03-19] Androsov, Maksim [user:Neon,2023-03-19] Mescheryakov ...
_We're excited to announce that registration for the Leagues of Code Summer
Camp is now open! This
Announcement of Educational Codeforces Round 145 (Rated for Div. 2)
72.
August Classes & Huawei IOI Camp 2024 Hello, everybody.
<spoiler summary="August CP School, cancelled">
August CP School
----------------
I'm again organizing group classes after trying the format [last month](https://codeforces.me/blog/entry/129878). There will be problem-solving, homework, and recordings. I can make a lecture on some topic per requests. There will be two groups. You can attend both, just don't spoil anything in the lower group. (Btw. I also want to do 3-month weekly classes after Summer.)
1. Medium group: [16:00-17:30 CEST](https://www.timeanddate.com/worldclock/fixedtime.html?iso=20240808T16&p1=262&ah=1&am=30), 90-minute lessons, CF max rating 1500-1800
2. Hard group: [18:00-20:00 CEST](https://www.timeanddate.com/worldclock/fixedtime.html?iso=20240808T18&p1=262&ah=2), 2-hour lessons, CF max rating 1900-2200
- Dates: August 8 to 26 or 29 (6 meetings in total)
- Every Monday and Thursday
- Price: 200 USD per person (so around 20$ per hour, or 13$ if you're going to attend both groups)...
? - Registration: will start on Monday, August 5. - Lectures: The example
lecture topics are those from Range, Update: contact me for Huawei IOI camp registration. You should be an IOI
participant or a coach
73.
AtCoder's new rated/unrated registration format It seems AtCoder is going to implement a new system where you choose if your participation in a contest is rated or unrated before you get to see the problems. Here are the full details from the [site](https://atcoder.jp/posts/745):
> We developed a new system where one can choose Rated or Unrated participation in contests. We will introduce this system from ABC230 on 3rd Dec.
> When registering for a rated contest, you can decide whether you want to be Rated or Unrated in advance. You can choose an option before the contest starts or in the first five minutes of the contest. If you choose Rated, your rating will be updated whether or not you open problems or make submissions.
> In a rated contest, you can open problems only after you choose Rated or Unrated participation. If you don't choose an option and five minutes have passed after the contest starts, you are considered Unrated. Also, if your rating doesn't fall within the rated range of the contest, you are automatically...
AtCoder's new rated/unrated registration format, can switch Rated/Unrated by first canceling your registration and then
registering for the contest, some problems in their current situation may choose to hold off on registration
, and decide within the, > Before a contest starts, you can switch Rated/Unrated by first canceling your
registration and
74.
CodeSprint LA 2025 — Registration Deadline Extended!! ### CodeSprint LA 2025 — Registration Deadline Extended!!
**[Update] <u>Final</u> last call for registration! We are extending the registration deadline to [Wednesday, May 14, 2025, 11:59 pm PDT](https://www.timeanddate.com/worldclock/fixedtime.html?iso=20250514T2359&p1=137)! If you haven't already, [register here now](https://codesprintla.uclaacm.com/register)! Don't miss out!**
Hello, Codeforces!
I'm excited to invite you to participate in [CodeSprint LA 2025](https://codesprintla.uclaacm.com/), UCLA ACM‑ICPC's annual beginner‑friendly algorithms contest, scheduled for [Sunday, May 18, 2025, 10 am — 5 pm PDT](https://www.timeanddate.com/worldclock/fixedtime.html?iso=20250518T1000&p1=137)!
**The contest itself runs from [Sunday, May 18, 2025, 11:30 am — 4:30 pm PDT](https://www.timeanddate.com/worldclock/fixedtime.html?iso=20250518T1130&p1=137)!**
[Registration is open here](https://codesprintla.uclaacm.com/register)! More information, rules and [the schedule](https://c...
CodeSprint LA 2025 — Registration Deadline Extended!!, **[Update] Final last call for registration! We are extending the registration
deadline to, [Registration is open here](https://codesprintla.uclaacm.com/register)! More
information, rules and
75.
Registrations count [statistics] Today (March 19, 2020) first time count of registrations per round became greater than fantastic 18000. To be presice it was 18180 (just one more and it would be palindrome). But only one (!) year ago it became more than 10000, so, it increased almost twice. <s>Yes, we are sick of sports programming and it's contagious.</s>
Less words, more pictures:
Three notable things:
* March, 2014: [Black day](https://codeforces.me/blog/entry/10683). I've already forgot about it. Now with even with more than 10k participants codeforces has almost no queue in the beginning of contests;
* September, 2015: [The Second Revolution of Colors and Titles](https://codeforces.me/blog/entry/20638);
* Upper envelope of this graph is combined contest, such as Hello/Goodbye/Global rounds.
[cut]
Some detailed graphs (count of rounds in brackets):...
76.
RSHF — a Rating and Report System (Beta) # TL-DR
##### https://rshf.net/ (not adapted for mobile)
##### https://chromewebstore.google.com/detail/rshf/jmpohmlhicdbghkhageaiefhenmkdfcg
(the most recent version will be available at https://github.com/welcome-to-the-sunny-side/rshf-extension)
<br>
# TS-DR
<img src="https://i.ibb.co/NdgvgPLG/logo.png" alt="RSHF logo" style="float:right;width:300px !important;height:auto;margin-left:30px; margin-bottom:6px;">
Simply put, RSHF offers the ability for users to form groups that have their own self-contained rating, report and moderation systems. Deeper visual integration with the Codeforces website is offered through a browser extension. More details on each of these components follow:
### Groups
Group members are partitioned into three tiers:
1. Admins
2. Moderators
3. Members
Their roles and responsibilities closely match what you might think they do: Admins and Moderators process reports and take appropriate actions in response. Admins have additi...
The [registration] -> [rating update] flow goes through in the following manner:
77.
2024-The 6th Turing Cup Tournament **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.
**Registration time:** April 19th — May 5th 8:00 AM（BJT）/ May 4th 5:00 PM PDT/ May 4th 8:00 PM EDT
**Registration method:** Click [XinYouDui contest system](https://contest.xinyoudui.com/recommend) directly for registration. So register here while you can! (It is recommended to use Chrome, Firefox browser)
**Registration requirements:** There are no age, level, or identity restrictions.
These awesome problems and editorials are written, prepared, and tested by the XinYouDui from Hangzhou Xuejun High School. Quality is ensured by top-notch participants of IOI 2024 China National Team and NOI gold medalists.
**Divisions:** Novice, Intermediate, Advanced
- Novice group: The entry-level level of programming with basic language application and basic algorithms ...
**Registration method:** Click [XinYouDui contest
system](https://contest.xinyoudui.com/recommend, **Registration requirements:** There are no age, level, or identity
restrictions., **Registration time:** April 19th — May 5th 8:00 AM（BJT）/ May 4th 5:00 PM PDT/
May 4th 8:00
78.
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...
The statements are [here](https://territoriali.olinfo.it/) (requires
registration). Each year
79.
SEERC 2023 and The 2nd Universal Cup. Stage 14: Southeastern Europe 
Hi everyone!
2023 Southeastern Europe Regional Contest will take place on December 9. The contest was prepared by [user:Pajaraja,2023-12-09], [user:milisav,2023-12-09], [user:bicsi,2023-12-09], [user:denis2111,2023-12-09], [user:antontrygubO_o,2023-12-09], and [user:RomaWhite,2023-12-09].
Good luck to the official participants!
This contest will be used as Stage 14 of The 2nd Universal Cup (a week after the official contest). Therefore, we ask official participants to not publicly discuss the problems before the Universal Cup Stage.
You will be able to participate in the UCup contest in the following time windows:
<spoiler summary="Time windows">
02:00 (UTC) on Saturday — 07:00 (UTC) on Saturday
05:00 (UTC) on Saturday — 10:00 (UTC) on Saturday
08:00 (UTC) on Saturday — 13:00 (UTC) on Saturday
11:00 (UTC) on Saturday — 16:00 (UTC) on Saturday
13:00 (UTC) ...
Register a new team: https://ucup.ac/register (the registration request will be
processed before
80.
[IOI 2025] How Is It a Disaster Already? I am the Deputy Leader for the Indonesia IOI 2025 delegation this year. I can't fathom how IOI 2025 has gone so horribly wrong before IOI has even started.
Firstly, I will share the experiences of the Indonesia team when traveling/arriving in Bolivia. Afterwards, I will mention some accounts provided by other countries about their struggles in Bolivia.
Before the journey even began, BoA cancelled one of the only flights from Sucre to Santa Cruz during the departure day, we are a bit concerned about the alternative flight as the transit time is only 1h10m especially after our recent experiences.
Our team's journey began on July 23rd before dawn, flying from Jakarta to Sao Paolo, we arrived the evening of July 23rd in Brazil without a hitch.
The following afternoon (July 24th), we got on our flight from Sao Paolo to Santa Cruz, departing at 14.00. During our check in process, we had to wait for some time because they were checking our documents (I would say roughly 15-45 mi...
depart for our registration soon, hopefully with less disasters.
81.
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 — May 25, 2025, 12:29 PM |
| Opening Ceremony | May 25, 2025, 07:50 AM — 08:30 AM |
| Contest Time | May 25, 2025, 08:30 AM — 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...
### Registration - **Time**: May 6th — May 25th 12:29 AM (BJT) - **Method**:
[(Chinese, ) | |----------------------|-----------------------------------------| |
Registration Time | May 06, 2025, 06:00 PM
82.
Invitation to Baozii Cup 3 Hello, Codeforces!
We are happy to invite you Baozii Cup 3, which will take place on [contest_time:664651].
You will have $5$ hours to solve $13$ problems, including **at least one** interactive problem.
This is a team contest following ACM/ICPC rules, with teams of up to $3$ members. The penalty for an incorrect submission is $20$ minutes.
The standings will be frozen for the last $60$ minutes of the contest.
Most problems are created and prepared by me, with help from [user:Bronya_H,2026-01-17], [user:zeemanz,2026-01-17], and [user:TRDOG,2026-01-17].
We would like to thank:
- [user:MikeMirzayanov,2026-01-17] for creating the fantastic CodeForces and Polygon platform.
- [user:Sserxhs,2026-01-17], [user:SATSKY_2025target_LGM,2026-01-17], [user:-WIDA-,2026-01-17], [user:fatalerror,2026-01-17], and [user:itsiftikar02,2026-01-17] for testing the round and providing valuable feedback.
- [user:-firefly-,2026-01-17] for generously letting me copy his [Soy Cup #2: ...
### Registration
83.
Educational Codeforces Round 35 [Rated for Div. 2] Hello Codeforces!
On [December 28, 17:05 MSK](http://www.timeanddate.com/worldclock/fixedtime.html?day=28&month=12&year=2017&hour=17&min=5&sec=0&p1=166) Educational Codeforces Round 35 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 one day 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,2017-12-27] Androsov, Vladimir [user:0n25,2017-12-27] Petrov, Alexey [user:Perforator,2017-12-27] Ripinen and me.
Thanks Mike [user:MikeMirzayano...
Registration is open for our upcoming [**1st Hello India x Russia Programming
Bootcamp**](http
84.
CodeSprint LA 2024 — Registration Deadline Extended! 
Dear Codeforces,
I am ecstatic to invite you to participate in [**CodeSprint LA 2024**](https://codesprintla.uclaacm.com/), UCLA ACM-ICPC's annual beginner-friendly algorithms contest, planned for **[Saturday, May 18, 2024, 10am — 5pm PDT](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CodeSprint+LA+2024&iso=20240518T10&p1=137&ah=7)**! **The contest itself runs from [Saturday, May 18, 2024, 11:30am — 4:30pm PDT](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CodeSprint+LA+2024+Contest&iso=20240518T1130&p1=137&ah=5)**!
The [codesprintla.com](https://codesprintla.uclaacm.com/) website is now live, [click here for more details](https://codesprintla.uclaacm.com/schedule). Or you can go straight to re...
CodeSprint LA 2024 — Registration Deadline Extended!, details](https://codesprintla.uclaacm.com/schedule). Or you can go straight to
registration at, registration at
[codesprintla.com/register](https://codesprintla.uclaacm.com/register). **The
85.
2026 Harker Programming Invitational — registration open! Hello Codeforces,
The Harker Programming Club is excited to announce that registration for HPI 2026 has opened! The event will be held at the Harker Upper School campus on **Saturday, March 7, 2026**. This year the theme of our contest will be CS & Linguistics. Teams of up to 3 students may participate in either our Novice or Advanced Division.
The details of this year's event are listed below:
- _Event Name:_ Harker Programming Invitational 2026
- _Date:_ March 7, 2026 (Saturday)
- _Time:_ 8 AM-12:30 PM PST
- _Participants:_ All competitors of any age are allowed. If you cannot participate in-person, there is an online version.
- _Location:_ The Harker Upper School campus (500 Saratoga Ave, San Jose, CA 95129)
<spoiler summary="Detailed schedule">
8:00-8:30: Registration
8:30-10:30: Contest
10:30-10:45: Break
10:45-11:30: Panel Session
11:30-12:00: Break
12:00-12:30: Awards Ceremony
</spoiler>
<spoiler summary="Flyers">
![flyer page 1](/predownload...
2026 Harker Programming Invitational — registration open!, 8:00-8:30: Registration, Hello Codeforces, The Harker Programming Club is excited to announce that
registration for HPI, The Harker Programming Club is excited to announce that registration for HPI
2026 has opened! The
86.
OCPC 2027 Winter in Hong Kong — 2–8 January Hi everyone!
<center><a href="https://ocpc.camp"><img src="https://ocpc.camp/images/ocpc_light.svg" height="80px"></a> <a href="https://icpc.foundation/"><img src="https://ocpc.camp/images/ICPC.svg" height="80px"></a></center>
<center><b>Supported by</b></center>
<center><a href="https://www.janestreet.com/"><img src="https://ocpc.camp/images/Jane%20Street.svg" height="48px"></a> <a href="https://www.cityu.edu.hk/"><img src="https://ocpc.camp/images/cityu.svg" height="40px"></a></center>
We're happy to invite you back to **OCPC 2027 Winter in Hong Kong**, on **2–8 January** at **City University of Hong Kong**! Join us onsite or online for a week of solving problems with your teammates, discussing solutions, and meeting other people who enjoy competitive programming.
There will be **seven five-hour ICPC-style contests**, one each day, followed by solution discussions. If you're heading to the Hong Kong ICPC Regional Contest on 9–10 January, the camp fits right before it. ...
before it. Registration for the Regional is separate., **. Registration closes on **16 January** (onsite) and **23 January** (online).
Eligible Ukrainian teams, **[Register your team](https://ocpc.camp/2027w/#registration)** · [Camp
details](https://ocpc.camp, You can find the [registration and refund
terms](https://ocpc.camp/2027w/legal.html) on the website
87.
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 — Jul 30, 2026, 12:29 PM |
| Opening Ceremony | Jul 30, 2026, 07:...
### Registration - **Method**: [XinYouDui contest
system](https://www.xinyoudui.com/) (Chrome, ) | |----------------------|-----------------------------------------| |
Registration Time | Jun 18, 2026, 06:00 PM
88.
solved.ac Grand Arena #1 Announcement Hi, I am [user:TheQueenOfHatred,2023-08-02], staff of the Korean programming site -- [solved.ac](https://solved.ac/en).
We will hold solved.ac Grand Arena Round 1.
- **Time**: https://www.timeanddate.com/worldclock/fixedtime.html?iso=20230806T14&p1=235&ah=3, 180 minutes
- **Problems**: 9, in ICPC format
- **Difficulty**: **Problems A and B are the first and second easiest problems expected by the jury.** The order will be random except for problems A and B. All problems' difficulty will be between Bronze and Diamond by the solved.ac scale.
- **Penalty**: 20 minutes; The scoreboard will freeze 30 minutes before the contest ends. Compilation errors do not count toward penalties.
- **Scoreboard**: ICPC style. The contestant with more solves is ranked in a higher place. If two contestants have the same number of solves, the contestant with the small amount of the sum of penalties over all accepted problems is ranked in a higher place.
- **Time and memory**: There is a handicap f...
registration anytime before the contest begins. - You can participate in the
Arena without registering. In
89.
Bredor Round Good evening, everyone.
In the course of the quarantine, nature has cleaned up so much that I came back to CF. Hello to those who don't know me, and sorry to others.
I want to introduce a few amendments to the gym section and add my contest there. I originally planned to host it on April 1st, but I was a bit late, so the contest will be half-joke, half-traditional.
You will be given **from 6 to 8 tasks** and **from 2 to 3 hours**. During the contest, you will be provided with the opportunity to help Mike, Rudolph, and some other good people.
The competition will be suitable **for all divisions, genders, and races**.
Of course, I would like to thank [user:MikeMirzayanov,2020-06-25] for CF and Polygon, and also express my condolences to people who agreed to test the problems.
The winner will be awarded a valuable prize — **an online certificate**.
The contest will start on [contest_time:102638], follow the link: [contest link](https://codeforces.me/contests...
**UPD1:** Registration will open 6 hours before the contest, **UPD2:** Registration is open now! Contest is available for registration by
the link above and in
90.
CCPC Finals 2025 and Grand Prix of Nanyang Hey Codeforces! I'm exicited to invite you to The 4th Universal Cup, Stage 23, the Grand Prix of Nanyang, taking place on May 2nd, 2026.
The contest is based on the Finals of the CCPC (China Collegiate Programming Contest), which was held on April 26, 2026. This is my fourth time create the problem-set and serve as a judge for the CCPC Finals.
This contest is prepared by [user:EvenImage,2026-04-29], [user:Qingyu,2026-04-29], [user:RDDCCD,2026-04-29], and [user:Kevin114514,2026-04-29], with the help of our outstanding judge team [user:Gellyfish,2026-04-29], [user:zhoukangyang,2026-04-29], [user:ODT,2026-04-29], [user:Coffee_zzz,2026-04-29], [user:unputdownable,2026-04-29].
Although the style of problems differs a bit, the difficulty of this problem set is close to the last (the 2nd) [Universal Cup Finals](https://finals.ucup.ac). We believe the problems will be engaging for all Div. 1 participants, while still providing a challenge for the strongest teams.
<spoiler summary=...
Register a new team: https://ucup.ac/register (the registration request will be
processed before
91.
Kotlin Heroes 6 Announcement <img src="/predownloaded/6b/62/6b62332b37519ade4a4d42cb266937c422b64557.png" style="width:500px;float:right;margin:0 1em 1em 1em;"/>
Hello, Codeforces!
First and foremost, we would like to say a massive thank you to everyone who entered and submitted their answers to the five Kotlin Heroes competitions which were held previously: [Episode 1](https://codeforces.me/contests/1170), [Episode 2](https://codeforces.me/contests/1211), [Episode 3](https://codeforces.me/contests/1297), [Episode 4](https://codeforces.me/contests/1346), and [Episode 5: ICPC Round](https://codeforces.me/contest/1431).
Ready to challenge yourself to do better? The [contest:1488] competition will be hosted on the Codeforces platform on [contest_time:1488]. The contest will last 2 hours 30 minutes and will feature a set of problems from simple ones, designed to be solvable by anyone, to hard ones, to make it interesting for seasoned competitive programmers.
**Prizes:**
**Top three winners will ge...
Registration is already open and available via [the
link](https://codeforces.me/contests/1488,1489
Announcement of Kotlin Heroes: Episode 6
Announcement of Kotlin Heroes: Practice 6
92.
April Fools Day Contest 2021 — ZS Edition Hi everyone,
April Fools is near and as usual we have an [April Fools Day Contest](https://codeforces.me/blog/entry/88840) on Codeforces this year. In addition to that, I usually try to host some form of mini April Fools Contest for my friends every year (or almost every year).
This year, I am trying to host a bigger April Fools Day contest than usual and I invite everyone to participate! In view of the April Fools contest on Codeforces, the round will begin at [31 March 10pm (GMT+8)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=April+Fools+Day+Contest+2021+%28ZS%29&iso=20210331T22&p1=122) and lasts for exactly $24$ hours (and thus it will end ~35 minutes before the CF April Fools round).
The contest will consist of several unusual tasks, and I hope that everyone will at least find something interesting. The problems will not be sorted by increasing order of difficulty (if the word difficulty is even applicable), so it is **highly advisable** to read (and try!)...
of a team, I encourage you to use the team registration feature on CF or at
least submit from just, **UPD 2:** Registration should be open now. The contest starts in ~6 hours.
Good luck and have fun
Announcement of April Fools Contest 2021 Archive (ZS)
93.
The 2nd Universal Cup. Stage 11: Nanjing Hello! I'm happy to announce The 2nd Universal Cup. Stage 11: Nanjing, which will be held on November 25th, 2023.
This contest is an official ICPC Regional Contest — The 2023 ICPC Asia Nanjing Regional Contest. The contest is prepared by the [SUA Programming Contest Problem Setter Team](https://sua.ac/), which was the fourth time for us to prepare the Nanjing Regional Contest. Due to the covid pandemic, the previous three Nanjing regionals were held online. As the pandemic has come to an end, we can finally gather in NUAA to participate in this wonderful contest.
<div class="row">
<img src="/predownloaded/5c/18/5c188f4d780927880fd5d129119baea901acaabf.jpeg" style="height: 262.0px;max-width: 100.0%;max-height: 100.0%;">
<img src="/predownloaded/3e/09/3e095e729a6804b2a0bf171a7b06551f25c82368.jpg" style="height: 262.0px;max-width: 100.0%;max-height: 100.0%;">
</div>
<div class="row">
<img src="/predownloaded/54/2f/542f1b72c1b4d6225be048a9ad31aac153ce7ad5.jpg" style...
Register a new team: https://ucup.ac/register (the registration request will be
processed before
94.
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>— 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...
1. Love solving programming challenges 1. Fill out the contest registration
form 1. Register at
95.
CodeSprint LA 2023 — Registration Deadline Extended! 
Dear Codeforces,
I am ecstatic to invite you to participate in [**CodeSprint LA 2023**](https://codesprintla.uclaacm.com/), UCLA ACM-ICPC's annual beginner-friendly algorithms contest, planned for [**Sunday, May 21, 2023, 10am — 5pm PDT**](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CodeSprint+LA+2023&iso=20230521T10&p1=137&ah=7)! **The contest runs from [**Sunday, May 21, 2023, 11:30am — 4:30pm PDT**](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CodeSprint+LA+2023+Contest+Time&iso=20230521T1130&p1=137&ah=5)!**
The [codesprintla.com](https://codesprintla.uclaacm.com/) website is now live, [click here for more details](https://codesprintla.uclaacm.com/). Or you can go straight to registration at [codesprintla.com/register](https://codesprintla.uclaacm.com/register). **The registration deadline has been extended to [Wednesday, May 17, 2023, 11:59 PDT](http...
CodeSprint LA 2023 — Registration Deadline Extended!, details](https://codesprintla.uclaacm.com/). Or you can go straight to
registration at, you can go straight to registration at
[codesprintla.com/register](https://codesprintla.uclaacm.com
96.
Educational Codeforces Round 36 [Rated for Div. 2] Hello Codeforces!
On [January 13, 16:05 MSK](https://www.timeanddate.com/worldclock/fixedtime.html?day=13&month=1&year=2018&hour=16&min=5&sec=0&p1=166) Educational Codeforces Round 36 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 (traditionally now) **rated for Div. 2**. It will be held on extented ACM ICPC rules. After the end of the contest you will have one day 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 Mikhail [user:PikMike,2018-01-12] Piklyaev, Ivan [user:BledDest,2018-01-12] Androsov, Sergey [user:sslotin,2018-01-13] Slotin and me....
You can find more information and registration, click
[here](http://in.harbour.space/icpc/acm-icpc
Announcement of Educational Codeforces Round 36 (Rated for Div. 2)
97.
DP Group Class in August 2025 _The blog publish date is incorrect, should be around 12.07.2025. CF saved the draft date._
Hi, I'm organizing paid group classes on Dynamic Programming in August. Last year, I did something similar with general problem-solving ([link](https://codeforces.me/blog/entry/129878)).
There will be two groups of different style and difficulty.
Each group gets 8 lessons of 1h30m each, from 28.07.2025 to 24-31.08.2025.
Group size up to 12 people.
You get access to recordings and problems from both groups, but you should actively attend only one.
There's a lot of homework, some to be discussed next lesson.
I will create new original CF/Polygon problems, especially for the easy group.
These problems will eventually be published for everybody!
**Price**: 250 EUR with a small country-based discount.
**Registration**: You should pay via [link (Stripe)](https://buy.stripe.com/7sY3cx2nD5Oh8CQ7w96wE03) and choose the group there. I will send you the Discord invite link via e-mail. Co...
recent LeetCode Weekly contest. 150 EUR / month. Registration soon., **Registration**: You should pay via [link
(Stripe)](https://buy.stripe.com/7sY3cx2nD5Oh8CQ7w96wE03
98.
Invitation to 4th Turing Cup Hey everyone,
Here's an invitation for all programming lovers to participate in the 4th Turing Cup competition!
The Turing Cup is an invitational competition that is organized by one of the most successful informatics competition teams in China, the XinYouDui, and X-Camp.
Several top students of XinYouDui: [Chao Li](https://stats.ioinformatics.org/people/2672) (IOI 2012 Gold Medalist)；[Yinzhan Xu](http://stats.ioinformatics.org/people/5059) (IOI 2014 Individual 1st place winner)；[Ce Jin](https://stats.ioinformatics.org/people/5872) (IOI 2016 Individual 1st place winner):
Top contestants such as IOI Gold medalists, and other top CPers joined the past contest as well.
The 4th Turing Fun cup is open for registration, come and code with us!
[Registration link](https://contest.xinyoudui.com/22a) (No Registration Fee)
Novice Group: We'd recommend programmers who have completed learning the language and basic algorithms and who are in USACO silver division, are eligible ...
**Q:** What kind of info does the registration need?, The 4th Turing Fun cup is open for registration, come and code with us!, [Registration link](https://contest.xinyoudui.com/22a) (No Registration Fee)
Announcement of The 4th Turing Cup
99.
VK Cup 2015: online mirror and final thanks **The registrations before 00:00 have been deleted, because the form didn't support teams. Please, register again if your registration has been affected.**
VK Cup 2015 Final Round has ended two days ago. It's very likely that you've seen our previous posts. The last event to happen is online mirror of the final round. It will be held on [Thursday, July 30th, at 19:00 Moscow time](http://www.timeanddate.com/worldclock/fixedtime.html?day=30&month=7&year=2015&hour=19&min=0&sec=0&p1=166). Individual contestants as well as teams consisting of two people may participate in this round. Round duration is three hours, problems will be shuffled in comparison with to the original order. Both division participants may take part, but we want to warn 2nd division contestants that problemset may be hard for them. This round is a rated Codeforces round.
Finally, we want to thank all people that made this Championship. Following VK developers, Codeforces team members and the other people suggeste...
, register again if your registration has been affected.**
Announcement of Codeforces Round 313 (Div. 1)
Announcement of Codeforces Round 313 (Div. 2)
Announcement of VK Cup 2015 - Finals
Announcement of VK Cup 2015 - Finals, online mirror
100.
Contests for Math: Repovive Math Contest Grand Opening Hello everyone!
Have you ever wished that math and combinatorics problems had the same live contest experience as competitive programming?
We have, so we are building exactly that on Repovive!
After beta testing our new Math section, we are ready to host the **Repovive Math Contest Grand Opening**.
You can already try our beta math problems here: https://repovive.com/problems/math
The theme of our first contest will be **Combinatorics**. The round will contain **5 combinatorics problems** to be solved in **2 hours and 30 minutes**. The problem set is intended to be suitable for a wide range of levels, so everyone is welcome to participate.
The contest is **rated for everyone**.
Since this is the first large live test of this format, we would especially love to have you participate, try the judging system, and share your feedback afterward.
* Start Time: [Tuesday, 29 September 2026, 14:35 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?iso=20260929T1...
$ * Registration: https://repovive.com/contests/math-round-1
101.
Unofficial Div 4 Round #2 Hello Codeforces!
------------------
[user:SlavicG,2020-10-01] and I are glad to invite you to Unofficial Div 4 Round #2. Which will take place [this Wednesday at 14:35 UTC](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Unofficial+Div+4+Round+2&iso=20201125T1430&p1=%3A&ah=2) (The round is over now, but you can still participate virtually). The round will not be rated for any participants since it is unofficial.
Contest link: https://codeforces.me/gym/102873
You will be given six tasks and two hours to solve them.
The problems were created and prepared by [user:ssense,2020-11-01] and [user:SlavicG,2020-10-01] for users with a rating range from 0 to 1400 but anyone is welcome to participate in the round!
We want to thank everyone who was involved in the round preparation:
[user:Errichto,2020-11-22] for thorough testing and publishing this round on the gym.
Also, after the contest [user:Errichto,2020-11-22] will post videos about this contest and the respon...
UPD 1: Registration available now!
Announcement of Unofficial Div 4 Round #2 by ssense SlavicG
102.
SnackDown 2021 is back! Registrations are now open Hi There!
I am so glad to announce that after a brief gap, SnackDown, CodeChef's global annual programming contest, is back this year!
The pandemic created a big gap, but we are glad that we could make it happen now. The announcement went yesterday, and today I am messaging to invite your registrations for SnackDown 2021. Yes, the registrations are open and will end on October 19th.
There is one important change this year, w.r.t SnackDown — SnackDown 2021 will be an individual-participant contest and not a team competition.
Why this change?
With the current restrictions of maintaining social distancing, we deemed it imprudent to conduct the contest in a team setup. While we feel that team collaboration makes SnackDown a unique event, we believe it’s safer not to risk the health and safety of our participants. We will revert to team-based competition in the next iteration of SnackDown.
A few important details, I want you to note:
Registrations are open now a...
103.
ACPC committee (The Greatest thieves to ever exist in the competitive programming world) **1500 USD**, contrary to what you may think this is not the price of an NBA finals ticket, it's the registration fees for ACPC (Arab Collegiate Programming Contest), no flight tickets included with mediocre accommodation.
These fees, However, included long opening and closing ceremonies in both of which we had to endure Mohammad Fouad's very dull and lame jokes (one of his childish doings: he stopped the opening ceremony, made us all stand then laughed and told us to sit down...).
Being funny was definitely not their strongest suit. Nor was organization for that matter, atrocious organization with hours spent exposed to extreme Egypt weather.
In addition to all of this, we had to starve our way through the competition with the very cheap and inedible food they provided.
**The most suspicious part was that they only accepted cash payments in dollars (they refused bank transfers or any other traceable payment methods) only dollars and only in CASH !!!!!!!**
You are pro...
the registration fees for ACPC (Arab Collegiate Programming Contest), no
flight tickets included with
104.
The story about SEERC or why I started to hate ACM "Everything is possible in ICPC as long as the community decides it should happen" — Bill Poucher.
Hello, community. I want to share my story about how our team got accepted to SEERC(Southeastern Europe Regional Contest) a couple of months ago and suddenly got declined a week ago(our registration was cancelled). I also want to ask some questions.
A little bit about regionals in Ukraine:
There are 2 stages before advancing to SEERC:
1. First stage is held in April(almost in the end of academic year) and all the teams from Ukraine have to attend to this stage in order to go to SEERC(there are also some exceptions)
2. Second stage is held in September(in the start of academic year)
There are also many "rules" for that stages, that are not mentioned anywhere in the official [icpc.baylor.edu](http://icpc.baylor.edu) site.
That already doesn't make any sense because some students entering the university at the start of academic year will not be able to compete in c...
Europe Regional Contest) a couple of months ago and suddenly got declined a
week ago(ourregistration, }$ him to reject our team registration, because our team was not accepted to
stage 2 of ukrainian
105.
Invitation to Soy Cup #2: Vivian Hello, Codeforces!
We are [euphoric](https://vndb.org/v88) to invite you to [contest:105928], which will take place on [contest_time:105928].
You will have $5$ hours to solve $13$ problems, including at least one interactive problem.
This is a team contest following ACM/ICPC rules, with teams of up to $3$ members. The penalty for an incorrect submission is **20 minutes**.
The standings will be frozen for the last **60 minutes** of the contest. The final results and editorial will be streamed live on [Bilibili](http://live.bilibili.com/802593) on [June 2, 2025, at 06:00 UTC](https://www.timeanddate.com/worldclock/fixedtime.html?iso=20250602T0600).
All problems are created and prepared by me.
We would like to thank:
1. [user:MikeMirzayanov,2025-05-26] for creating the fantastic CodeForces and Polygon platform.
2. [user:torif,2025-05-30] for sponsoring the round.
3. [user:SATSKY_2025target_LGM,2025-05-26], [user:Tobo,2025-05-26], [user:AkaiLemon,2025-05-28], [user:...
### Registration, UPD2: The registration will be closed by [June 1, 2025, at 11:30 UTC](https
Announcement of Soy Cup #2: Vivian
106.
Kotlin Heroes: Episode 4 <img src="/predownloaded/d3/f6/d3f67b5afe94939d82d9358aeb7a0edcf6a8d33f.png" style="width:300px;float:right;margin:0 1em 1em 1em;"/>
Hello, Codeforces!
First and foremost, we would like to say a massive thank you to everyone who entered and submitted their answers to the first, second and third Kotlin Heroes competitions which were held previously.
Congratulations to the top 3 winners:
**Episode 1**
1. [user:Petr,2020-02-26]
1. [user:ecnerwala,2020-02-26]
1. [user:eatmore,2020-02-26]
**Episode 2**
1. [user:tourist,2020-02-26]
1. [user:eatmore,2020-02-26]
1. [user:Benq,2020-02-26]
**Episode 3**
1. [user:Egor,2020-05-23]
1. [user:tourist,2020-05-23]
1. [user:Benq,2020-05-23]
Ready to challenge yourself to do better? The fourth "Kotlin Heroes" competition will be hosted on the Codeforces platform
on [contest_time:1346]. The contest will last 2 hours 30 minutes and will feature a set of problems from simple ones, designed to be solvable by anyone, to hard...
Registration is already open and available via
Announcement of Kotlin Heroes: Episode 4
Announcement of Kotlin Heroes: Practice 4
107.
Educational Codeforces Round 178 [Rated for Div. 2] <img alt="Neapolis University Pafos" src="/predownloaded/9a/33/9a332fadbb47050ba9405057df022a6e37eaf5c0.png" style="float:right;height: 200px; margin: 10px; max-width:40%;"/>
Hello Codeforces!
The series of Educational Rounds continues thanks to the support of the [Neapolis University Pafos](https://www.nup.ac.cy/).
On [contest_time:2104] [contest:2104] will start.
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,2025-03-16] Dalabaev, Mikhail [user:awoo,2025-04-27] Piklyaev, Maksim [user:Neon,2025-03-16] Mescheryakov, Ale...
**upd:** Unrated registration is possible now. Sorry for the inconvenience.
Announcement of Educational Codeforces Round 178 (Rated for Div. 2)
108.
The 2nd Universal Cup. Stage 23: Shanghai (ICPC Asia EC Finals 2023) Hello everyone!
We are thrilled to invite you to **The 2nd Universal Cup, Stage 23: Shanghai**, taking place on February 17th, 2024.
This stage is based on The 2023 ICPC Asia East Continent Final Contest, which is the last contest in the Asia EC Region in this season. 280 official teams participated in the onsite contest competed for the last WF slots of the season.
I would like to thank all task writers for their efforts on preparing the contest. They are [user:dXqwq,2024-02-16], [user:jqdai0815,2024-02-16], [user:Kubic,2024-02-16], [user:littlelittlehorse,2024-02-16], [user:MagicalFlower,2024-02-16], [user:Qingyu,2024-02-16], [user:QuietBeautifulThoughts,2024-02-16], [user:unputdownable,2024-02-16], and [user:xyz2606,2024-02-16].
Also a big thank you to all the people who tested the contest and gave their valuable advice: [user:__ZMF__,2024-02-16], [user:antontrygubO_o,2024-02-16], [user:chenjb,2...
Register a new team: https://ucup.ac/register (the registration request will be
processed before
109.
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.
**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...
* More details about registration and further process for Regional round is
available [here](https
110.
Educational Codeforces Round 188 [Rated for Div. 2] <img alt="Neapolis University Pafos" src="/predownloaded/9a/33/9a332fadbb47050ba9405057df022a6e37eaf5c0.png" style="float:right;height: 200px; margin: 10px; max-width:40%;"/>
Hello Codeforces!
The series of Educational Rounds continues thanks to the support of the [Computer Science and Artificial Intelligence (CSAI)] (https://lp.jetbrains.com/academy/csai-program/) program at [Neapolis University Pafos](https://www.nup.ac.cy/), with scholarships provided by JetBrains.
[contest:2204] will start on [contest_time:2204].
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 **6-7 problems** and **2 hours** to solve them.
The problems were invent...
- **Tracks**: Competitive Programming and Software Engineering. - **Registration
Deadline**: April
Announcement of Educational Codeforces Round 188 (Rated for Div. 2)
111.
ICPC 2021 North America Championship Made Virtual Last Minute North American ICPC participants were all ready to go to Orlando, Florida for a week-long event including NAPC (North America Programming Camp) and NAC (North America Championship), which will decide the 2021 World Finalists from North America. With less than a week's notice, and after all travel plans were arranged by the teams, the following announcement was made.
> Dear NAC — NAPC Participant,
> Due to the surge in COVID-19 cases across the country and, in particular, the region surrounding the event location, the 2021 North America Programming Camp (NAPC) and North America Championship (NAC) events will be conducted virtually. Registration fees paid by NAPC teams will be refunded. The health of our participants, university partners, and all of our communities is always our top priority.
> Though conducted virtually, the NAPC-NAC will take place in the same timeframe (8-15 Aug.) with largely the same schedule as originally scheduled. We will finalize these details in ...
(NAC) events will be conducted virtually. Registration fees paid by NAPC teams
will be refunded. The
112.
Anouncement about Amritapuri ICPC and other Indian regionals Hi all, an important announcement about icpc (https://www.amrita.edu/icpc21)
It has been decided to conduct the Asia Amritapuri ICPC Preliminary and Regional Round in the month of June and July respectively because of the current pandemic situation. Registration will end 10 days before the Preliminary Online Round.
Teams can register at two sites as per the rules, if the contest is announced by other sites. Most probably Kanpur & Gwalior sites also will host the contest. ~In,2021-07-27 that case, there will be one single round of online contest. This will be announced soon~.
Tentative date for the Preliminary Round Online contest: Last week of June 2021.
Duration: 2.5 hours
There is no registration fee to participate in the Preliminary Online Round.
Regional Round: July second week.
Duration: 5 hours
Teams will be promoted after the Preliminary Online Round.
Regional Round will be held online on [CODEDRILLS](https://codedrills.io/) platform.
Amrita wil...
of June and July respectively because of the current pandemic situation.
Registration will end 10, If any queries related to this or ICPC registration, please ask at [CodeDrills
Discuss](https, There is no registration fee to participate in the Preliminary Online Round.
113.
CodeSprint LA 2022 — Registration Deadline Extended! 
Dear Codeforces,
I am pleased to invite you to participate in [CodeSprint LA 2022](https://codesprintla.com), UCLA ACM-ICPC's annual beginner-friendly algorithms contest, planned for **[Sunday, May 22, 2022, 10am — 5pm PDT](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CodeSprint+LA+2022&iso=20220522T10&p1=137&ah=7)**!
The [codesprintla.com](https://codesprintla.com) website is now live, [click here for more details and registration](https://codesprintla.com). Or you can go straight to registration at [codesprintla.com/register](https://codesprintla.com/register). **The registration deadline has been extended to [Wednesday, May 18, 2022, 11:59pm PDT](https://www.timeanddate.com/worldclock/fixedtime.html?iso=20220518T2359&p1=137)**!
This year we are planning (subject to change):
- 2hr individual round and 3hr team round (3 members per team) with ICPC scoring
- Beginner (around Div...
CodeSprint LA 2022 — Registration Deadline Extended!, and registration](https://codesprintla.com). Or you can go straight to
registration at, here for more details and registration](https://codesprintla.com). Or you can
go straight to
114.
Invitation for ICPC Indonesia COMPFEST 12 Multi-Provincial Contest Online Mirror Hello Codeforces Community. I would like to invite you all for [ICPC Indonesia COMPFEST 12 Multi-Provincial Contest Online Mirror](https://codeforces.me/contests/1425). I am the Person In Charge of the event.
<img alt="compfestlogo" src="/predownloaded/88/b0/88b08f638596aeda8840ec8d7e5dd9944c17286a.jpg" style="float: right;height: 200.0px;margin: 10.0px;max-width: 100.0%;max-height: 100.0%;">
I want to thank:
- Faculty of Computer Science, The University of Indonesia, for providing guidance and support for the official event.
- Our committee: [user:hocky,2020-09-24], [user:julianfernando,2020-09-24], [user:faustaadp,2020-09-24], [user:dewa251202,2020-09-24], [user:MIsForMiracle,2020-09-24], [user:faishol27,2020-09-24].
- Our testers: [user:AMnu,2020-09-24], [user:stevenwjy,2020-09-24], [user:Yehezkiel,2020-09-24]
- [user:MikeMirzayanov,2020-09-24]: for giving us the opportunity to host this online mirror. Also, for Codeforces and Polygon platform.
The online mir...
1. Extra Registration ([user:LJC00118,2020-09-29], [user:xay5421,2020-09-29],
[user:Sooke,2020-09
115.
The 1st Universal Cup. Stage 17: Guangzhou (CCPC Final 2022) The 17th round of the first Universal Cup is happening this week. The contest is based on the Final Contest of the China Collegiate Programming Contest (中国大学生程序设计竞赛, CCPC), which took place in Guangzhou on May 14th, 2023. Around 130 teams joined the on-site round.
Onsite Judges: [user:amiya,2023-05-17], [user:Qingyu,2023-05-17]
Tasks Authors: [user:amiya,2023-05-17], [user:djq_cpp,2023-05-17], [user:flowerletter,2023-05-17], [user:gyh20,2023-05-17], [user:ix35,2023-05-17], [user:Rebelz,2023-05-17], [user:Qingyu,2023-05-17], [user:Yakumo_Ran,2023-05-17]
Testers: [user:AcFunction,2023-05-17], [user:changruinian2020,2023-05-17], [user:cnnfls_csy,2023-05-17], [user:Crystally,2023-05-17], [user:emptyhope,2023-05-17], [user:flowerletter,2023-05-17], [user:gyh20,2023-05-17], [user:He_Ren,2023-05-17], [user:Heltion,2023-05-17], [user:kgqy,2023-05-17], [user:llzer,2023-05-17], [user:loveye,2023-05-17] , [user:lqx2005,2023-05-17], [user:MagicNiu,2023-05-17], [user:Mr_Eight,2023-05-17], ...
Register a new team: https://ucup.ac/register (the registration request will be
processed before
116.
Kotlin Heroes 7 Announcement <img src="/predownloaded/6b/62/6b62332b37519ade4a4d42cb266937c422b64557.png" style="width:500px;float:right;margin:0 1em 1em 1em;"/>
Hello, Codeforces!
First and foremost, we would like to say a massive thank you to everyone who entered and submitted their answers to the five Kotlin Heroes competitions which were held previously: [Episode 1](https://codeforces.me/contests/1170), [Episode 2](https://codeforces.me/contests/1211), [Episode 3](https://codeforces.me/contests/1297), [Episode 4](https://codeforces.me/contests/1346), [Episode 5: ICPC Round](https://codeforces.me/contest/1431), and [Episode 6](https://codeforces.me/contest/1488).
Ready to challenge yourself to do better? The [contest:1533] competition will be hosted on the Codeforces platform on [contest_time:1533]. The contest will last 2 hours 30 minutes and will feature a set of problems from simple ones, designed to be solvable by anyone, to hard ones, to make it interesting for seasoned competitive programme...
Registration is already open and available via [the
link](https://codeforces.me/contests/1532,1533
Announcement of Kotlin Heroes: Practice 7
Announcement of Kotlin Heroes: Episode 7
117.
Educational Codeforces Round 27 Hello Codeforces!
On [August 21, 18:05 MSK](http://www.timeanddate.com/worldclock/fixedtime.html?day=21&month=8&year=2017&hour=18&min=5&sec=0&p1=166) Educational Codeforces Round 27 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).
The round will be **unrated** for all users and will be held on extented ACM ICPC rules. After the end of the contest you will have one day 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,2017-08-21] Androsov, Vladimir [user:0n25,2017-08-21] Petrov, Mike [user:MikeMirzayanov,2017-08-02] Mirzayanov and me.
Good luck to all particip...
Announcement of Educational Codeforces Round 27
118.
Google Code Jam 2020 [Google Code Jam 2020](https://codingcompetitions.withgoogle.com/codejam) has been announced. [Here](https://codingcompetitions.withgoogle.com/codejam/schedule) is the schedule:
* Registration: [March 3, 19:00 UTC](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Google+Code+Jam+2020+registration&iso=20200303T19&p1=1440) ‒ [April 5, 2:00 UTC](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Google+Code+Jam+2020+registration+ends&iso=20200405T02&p1=1440).
* Qualification round: [April 3, 23:00 UTC](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Google+Code+Jam+2020+Qualification+round&iso=20200403T23&p1=1440) ‒ [April 5, 2:00 UTC](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Google+Code+Jam+2020+Qualification+round+ends&iso=20200405T02&p1=1440).
* Round 1A: [April 11, 1:00 UTC](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Google+Code+Jam+2020+Round+1A&iso=20200411T01&p1=1440&ah=2&am=30).
* Round 1B: [April 19, 16:00 UTC](https...
* Registration: [March 3, 19:00
UTC](https://www.timeanddate.com/worldclock/fixedtime.html?msg, ](https://codingcompetitions.withgoogle.com/codejam/schedule) is the schedule: *
Registration
119.
44th Petrozavodsk Programming Camp. Registration The Registration for the 44th Petrozavodsk Programming Camp is open.
**THE CAMP WILL BE HELD ONLINE** from January 31 to February 07, 2023.
Teams of up to 3 members are invited to join
<img align="center" width="30%" height="30%" src="/predownloaded/89/61/896113d02546099757a3be26a189869b0b358563.png">
The level of contests: for participants of the semi-finals and finals of the ICPC World Championship
The training Camp schedule consists of 7 contests and 1 day off between them,
preliminary schedule: [camp.icpc.petrsu.ru/2023w/schedule](https://camp.icpc.petrsu.ru/2023w/schedule)
Competitions will be held on the Yandex.Contest platform.<br>
For each contest, a problem analysis will be broadcast in English.
The registration fee for participants from the EAEU countries is 7,200 rubles per participant. <br>
The registration fee for participants from other countries is $150 per participant.
Additional information about [winter Camp 2020:](https://codeforces.co...
44th Petrozavodsk Programming Camp. Registration, , each team member must go through individual registration on the site of the
Camp., The Registration for the 44th Petrozavodsk Programming Camp is open., The registration fee for participants from the EAEU countries is 7,200 rubles
per participant.
120.
Kotlin Heroes 8 Announcement <img src="/predownloaded/dc/3d/dc3d601ff391e638c1f2b20ec167083978099bbe.png" style="width:500px;float:right;margin:0 1em 1em 1em;"/>
Hello, Codeforces!
First and foremost, we would like to say a massive thank you to everyone who entered and submitted their answers to the seven Kotlin Heroes competitions which were held previously: [Episode 1](https://codeforces.me/contests/1170), [Episode 2](https://codeforces.me/contests/1211), [Episode 3](https://codeforces.me/contests/1297), [Episode 4](https://codeforces.me/contests/1346), [Episode 5: ICPC Round](https://codeforces.me/contest/1431), [Episode 6](https://codeforces.me/contest/1488), and [Episode 7](https://codeforces.me/contest/1533).
Ready to challenge yourself to do better? The [contest:1571] competition will be hosted on the Codeforces platform on [contest_time:1571]. The contest will last 2 hours 30 minutes and will feature a set of problems from simple ones, designed to be solvable by anyone, to hard ones, to mak...
Registration is already open and available via [the
link](https://codeforces.me/contests/1570,1571
Announcement of Kotlin Heroes: Practice 8
Announcement of Kotlin Heroes: Episode 8
121.
VK Cup — Computer Programming Championship ### Overview
The VK Cup Championship is an open computer programming competition that is held by [VK](http://vk.com), [Codeforces](http://codeforces.com) and [Saratov State University](http://en.sgu.ru/). [VK](http://vk.com) is the largest European social network with more than a 100 million active users. The Championship Final Round will be held in July in St. Petersburg. Top 50 contestants of the Round 3 will be invited to the Finals, with trip expenses covered by the organizing committee.
### Eligibility
You are young and you like to solve programming problems? Then this championship is for you! Anyone meeting the following criteria is eligible to compete in the VK Cup:
- must be at least 14 years and at most 23 complete years of age (by the moment of registration);
- current employees of VK and/or members of organizing committee/jury are ineligible to participate in the VK Cup;
- must be eligible for participation in Codeforces contests.
Thus, the intended audience...
advance to the next round. All rounds require individual registration
(separate from the, - must be at least 14 years and at most 23 complete years of age (by the moment
ofregistration, The registration will be open soon and stay open till the end of the second
qualification round.
122.
solved.ac Onsite Grand Arena Party Announcement Hi, I am [user:TheQueenOfHatred,2023-12-18], staff of solved.ac.
We will hold an onsite Grand Arena event in the Republic of Korea. If you've previously participated in the Arena contests and willing to visit Korea in February, we welcome you!
This on-site competition requires participants to attend the competition site to participate physically. If you cannot participate in the on-site competition, please apply during the application period for this competition's mirror contest(solved.ac Grand Arena #4), which will be open after the application for participation in this competition has closed.
Please refer to the following guide for registering in the Arena contest:
- https://help.solved.ac/en/arena/getting-started/link-account
----
Sponsored by [NEXON Korea Corporation](https://company.nexon.com), [Chris 'utilforever' Ohk](https://github.com/utilForever)
**English statements are provided in the onsite contest, but please understand that the competition and side e...
### Registration Deadline, $A$, $B$, $C$, $D$, $E$, $F$, $X$, $Y$, $Z$ will be announced after registration
closes and vary, Although not currently indicated on the registration page, the competition will
be held in the, Please carefully check the information below before registration.
123.
Kotlin Heroes 5: ICPC Round Announcement <img src="/predownloaded/62/39/62391c8471a7dc4ca0b2f2da3e7903eefd1f3dc0.png" style="width:500px;float:right;margin:0 1em 1em 1em;"/>
Hello, Codeforces!
First and foremost, we would like to say a massive thank you to everyone who entered and submitted their answers to the first, second, third, and fourth Kotlin Heroes competitions which were held previously: [Episode 1](https://codeforces.me/contests/1170), [Episode 2](https://codeforces.me/contests/1211), [Episode 3](https://codeforces.me/contests/1297) and [Episode 4](https://codeforces.me/contests/1346).
Ready to challenge yourself to do better? The [contest:1431] competition will be hosted on the Codeforces platform on [contest_time:1431]. The contest will last 2 hours 30 minutes and will feature a set of problems from simple ones, designed to be solvable by anyone, to hard ones, to make it interesting for seasoned competitive programmers.
**Prizes:**
**Top three winners will get prizes of $512, $256, and $128 re...
Registration is already open and available via [the
link](https://codeforces.me/contests/1432,1431
Announcement of Kotlin Heroes 5: ICPC Round
Announcement of Kotlin Heroes 5: ICPC Round (Practice)
124.
The 2nd Universal Cup. Stage 17: Jinan Greetings!
We are thrilled to invite you to **The 2nd Universal Cup, Stage 17: Jinan**, taking place on January 6th, 2024.
The contest is an official ICPC Regional Contest — The 2023 ICPC Asia Jinan Regional Contest. Just like Nanjing and many other Chinese Regionals, there is finally an onsite event after three years of the online contest.
As the chief judge for the second time in an ICPC regional contest, I am proud of the hard work and dedication that has gone into preparing this contest. We hope it provides an enriching and enjoyable experience for all participants.
<div class="row">
<img src="/predownloaded/3e/fb/3efb84c9d4de18090f1f7e9bd53643a61e7952a9.jpg" style="height: 262.0px;max-width: 100.0%;max-height: 100.0%;">
<img src="/predownloaded/e2/b1/e2b11dc464915aaf48ebe5d3775554b35d7ba7b8.jpg" style="height: 262.0px;max-width: 100.0%;max-height: 100.0%;">
</div>
<div class="row">
<img src="/predownloaded/fa/1a/fa1ab6837f784ccdd71b13b270d1fe2f919c531...
Register a new team: https://ucup.ac/register (the registration request will be
processed before
125.
ICPC : GO FOR GOLD Announcing GO For Gold Campaign (Powered by NST)
----------------------------------------------------
#### Greeting Indian ICPC contestants !!
--------------------------------
India is home to some of the brightest minds in the world, and our potential is undeniable. Yet we have a long way to go regarding Competitive Programming at ICPC. While Indian teams have shown great promise by reaching to World Finals but getting a medal is still something which we are still trying to achieve. But with our current talent and potential, we can and will achieve this.
At NST, we believe the potential exists, and what’s needed is structured guidance, consistent mentorship, and a platform to hone these skills under expert supervision. That’s why we created Go For Gold, a program focused on building a culture of competitive programming excellence in India, not just for one college or a year, but as a long-term init...
Registration Deadline: **18th Nov 2024**, Registration Link: [Fill this form for
interest](https://forms.gle/LaKwkVKwAyApCCkcA)
126.
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...
**UPD3:** Registration deadline comes in **30 hours**.
127.
Noon Cake Programming Contest 2026 Announcement Hello Codeforces!
Noon is thrilled to invite you to participate in the first-ever Noon Cake Programming Contest (NCPC)!
Noon is building the future of e-commerce for the Middle East, and we are powered by a world-class engineering team. We're passionate about problem-solving and competitive programming, and we want to celebrate that with the community.
Our problem-setting team includes several ICPC World Finalists and IOI Medalists who have crafted an exciting set of challenges for you. We can't wait for you to try them!
The contest will be held in two phases:
Phase 1: Qualification Round
This round is open to everyone, all around the world! It's your chance to test your skills against a high-quality problem set and have fun. <br>
Date: 2026-01-31 <br>
Time: 12:35 EGY (UTC+2) <br>
Duration: 4 hours <br>
Who: Everyone! <br>
Registration: [form](https://docs.google.com/forms/d/e/1FAIpQLS...
> Duration: 4 hours
Who: Everyone!
Registration: [form](https://docs.google.com/forms/d/e
128.
40th Petrozavodsk Programming Camp. Registration The Registration for the 40th Petrozavodsk Programming Camp is open.
**THE CAMP WILL BE HELD ONLINE** from January 29 to February 08, 2021.
Teams of up to 3 members are invited to join
<img align="center" width="30%" height="30%" src="/predownloaded/7a/1c/7a1c9df2729dbf649fee8c70a37b750d386248ad.png">
The level of contests: Division A / B, i.e. participants of the semi-finals and finals of the ICPC World Championship
The training Camp schedule consists of 9 contests and 2 days off between them,
preliminary schedule: [camp.icpc.petrsu.ru/2021w/schedule](https://camp.icpc.petrsu.ru/2021w/schedule)
Competitions will be held on the Yandex.Contest platform.<br>
For each contest, an analysis will be broadcast in English.
The registration fee for participants from the EAEU countries is 15,000 rubles per team. <br>
The registration fee for participants from other countries is $300 per team.
**Participants who registered before January 19 will receive T-shirts wi...
40th Petrozavodsk Programming Camp. Registration, The Registration for the 40th Petrozavodsk Programming Camp is open., The registration fee for participants from the EAEU countries is 15,000 rubles
per team.
The
129.
Crypto Cup 1.0 Hello everyone.
[Soon](http://www.timeanddate.com/worldclock/fixedtime.html?msg=Crypto+cup+1.0&iso=20141101T15&p1=246&ah=6), On the night after the Halloween, there will be a Codeforces gym contest, named **Crypto cup 1.0**.
Like its name, it's a cryptography contest and for all problems, you are given some sample encryptions encrypted using a certain algorithm and you have to write a program to decrypt the given messages.
There will be 18 problems and you have 6:30 hours to solve them. I hope it will be interesting.
Problems are prepared by me ([user:PrinceOfPersia,2014-10-21]) and tested by [user:DamonSalvatore,2014-10-21] also thanks [user:Swift,2014-10-21] for editing problem statements.
For practicing cryptography, we recommend [SecutiryOverRide](http://securityoverride.org)'s cryptography challenges.
Also, this round needs a little Algorithm and CS knowledge.Don't forg...
**UPD4: Registration is open.**
Announcement of Crypto Cup 1.0
130.
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...
rating below 1600 can also use unrated registration to participate
unofficially.
Announcement of Codeforces Round 995 (Div. 3)
131.
CerealCodes Summer 2023 Programming Contest <center> Hello Codeforcers :3 </center>
=================
**UPD 1: Opening ceremony on [Friday 7PM EST](https://www.timeanddate.com/worldclock/fixedtime.html?iso=20230811T190000&p1=179). Join our [Discord server](https://discord.gg/qve3dBA8Ek) for more information**
**UPD 2: Contest has started! You may start your window anytime over the next 2 days. Join our [Discord server](https://discord.gg/qve3dBA8Ek) to ask clarifications for any problems. Good luck!**
From the authors behind [contest:1852] and [contest:1853], CerealCodes is excited to announce our Summer 2023 Programming Contest!
This contest will be held on August $13 - 15$ th with a customizable time-frame window. The time limit for novice
is $3$ hours while intermediate and advanced are allowed $3.5$ hours. All of the contest information, including exact start and end times, can be found [here](https://www.cerealcodes.org/contestinfo).
The competition has three divisions: Novice (USACO Bronze-Silver or Div....
**All of the logistics, registration, and the contest platform will be held on
our [website](https
132.
VNOI Cup 2025 — Final Mirror 
Hello again Codeforces!
We are excited to invite you to the mirror contest of the VNOI Cup 2025 Final Round! Join us on [Friday, July 18, 2025, at 10:00 AM GMT+7](https://www.timeanddate.com/worldclock/fixedtime.html?msg=VNOI+Cup+2025+-+Final+Mirror&iso=20250718T10&p1=3909&ah=5) (this is 60 minutes after the official onsite round starts) and try the same fun, yet challenging problems as our finalists!
VNOI Cup is a Competitive Programming competition hosted by VNOI (Vietnam Olympiads in Informatics community), a group of Vietnamese programmers working together to make programming competitions more fun and challenging in Vietnam. We're a non-profit organization dedicated to supporting the growth of competitive programming in Vietnam, and this competition is one of the many ways we aim to achieve that goal.
A huge shoutout to our awesome problem setters and testers! Thanks to their hard work, we have an e...
). It will be opened closer to the contest date for registration.
133.
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...
. The total cost is **75,000 EGP (~1,587 USD)**, covering registration, travel,
and accommodation.
134.
[Suggestion] Keep Extra Registration Open Throughout Codeforces Rounds <spoiler summary="Tragic Backstory">
In today's Codeforces round, I realised a minute before the contest that I had forgotten to register. "No problem", I thought to myself, "extra registration open in a few minutes". To try to minimise penalty losses due to my delayed submissions, I decided to start with problem C. Unfortunately, it took me longer to implement than I expected, and by the time I was ready to submit, the extra registration period had ended. Now I am left with nothing to do for the next hour and twenty minutes :(
</spoiler>
As the title suggests, I would like to propose that Codeforces keep its extra (late) registration open throughout the contest. Unlike AtCoder, where such a system is problematic due to its penalty system, Codeforces' penalty for submissions increases every minute, and it is no different to registering 2 days before the contest, so it isn't exploitable.
I don't see any reason not to have this, unless it is too much of a technical difficulty due...
[Suggestion] Keep Extra Registration Open Throughout Codeforces Rounds, contest that I had forgotten to register. "No problem", I thought to myself,
"extraregistration open, the contest that I had forgotten to register. "No problem", I thought to
myself, "extraregistration, As the title suggests, I would like to propose that Codeforces keep its extra
(late)registration
135.
2018-2019 ACM-ICPC, Asia Shenyang Regional Contest (Online Mirror on Gym) Hi all!
The 2018 ACM-ICPC Asia Shenyang Regional Contest has ended on October 21. At this site, 186 official teams and 6 guest teams selected from the preliminary online contest have competed in **5 hours**, trying to solve **13 problems**.
We are glad to invite you all from Codeforces, one of the greatest programming communities, to participate in its online-mirror contest, [contest:101955]!
Please notice the online-mirror contest will start at an unusual time, [Saturday, November 24, 2018 at 18:00 (UTC+8)](https://www.timeanddate.com/worldclock/fixedtime.html?day=24&month=11&year=2018&hour=18&min=0&sec=0&p1=33), when we are able to answer your questions during the online contest. By the way, we have added the onsite board, so when you are participating (during the mirror contest or virtual participation), you may take advantage of it!
This contest follows [the ACM-ICPC rule](https://icpc.baylor.edu/regionals/rules) and it will be **unrated**. Both personal registration an...
**unrated**. Both personal registration and team registration are recommended.
You may register for, **UPD2:** Registration starts. You may [view this
page](https://codeforces.me/gymRegistration
136.
Educational Codeforces Round 56 [Rated for Div. 2] Hello Codeforces!
On [contest_time:1093] [contest:1093] 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 extented ACM 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 **7 problems** and **2 hours** to solve them.
The problems were invented and prepared by Roman [user:Ajosteen,2018-12-14] Glazov, Adilbek [user:adedalic,2018-12-14] Dalabaev, Vladimir [user:Vovuh,2018-12-14] Petrov, Ivan...
/icpc/icpc-hello-muscat-bootcamp-2019/?utm_source=codeforces) registration is
open! The camp will
Announcement of Educational Codeforces Round 56 (Rated for Div. 2)
137.
Kotlin Heroes 9 Announcement <img src="/predownloaded/dc/3d/dc3d601ff391e638c1f2b20ec167083978099bbe.png" style="width:500px;float:right;margin:0 1em 1em 1em;"/>
**Given the current circumstances, we have decided to postpone Kotlin Heroes until further notice. Thank you for your understanding.**
Hello, Codeforces!
First and foremost, we would like to say a massive thank you to everyone who entered and submitted their answers to the eight Kotlin Heroes competitions which were held previously: [Episode 1](https://codeforces.me/contests/1170), [Episode 2](https://codeforces.me/contests/1211), [Episode 3](https://codeforces.me/contests/1297), [Episode 4](https://codeforces.me/contests/1346), [Episode 5: ICPC Round](https://codeforces.me/contest/1431), [Episode 6](https://codeforces.me/contest/1488), [Episode 7](https://codeforces.me/contest/1533), and [Episode 8](https://codeforces.me/contest/1571).
Ready to challenge yourself to do better? The [contest:1643] competition will be hosted on the Codef...
Registration is already open and available via [the
link](https://codeforces.me/contests/1643,1645
138.
[GYM] Loyalixa Titans Contest I Hello, Codeforces!
We’re thrilled to announce the 1ˢᵗ round of [Loyalixa Titans Contest (LTC)](https://codeforces.me/group/HcnH7vLzrr/contests) that will be held on [Saturday, Nov 2, 2024 at 20:00 UTC+2 in Cairo, Egypt.](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Loyalixa+Titans+Contest+I&iso=20241102T20&p1=53)
[Loyalixa](https://fb.com/loyalixa) is a passionate team dedicated to empowering the coding community, especially in the Arab world, through comprehensive training and resources.
**Our services include a range of courses in programming, problem-solving, data structures, algorithms, desktop and mobile application development, and more. With experienced instructors and a hands-on approach, we aim to help learners at all levels grow their skills and achieve their goals.**
**We would like to thank:**
- [user:MikeMirzayanov,2024-11-01] for the Polygon and Codeforces platforms.
...
**UPDATE 1:** [Registration is now
open](https://codeforces.me/group/HcnH7vLzrr/contests)
139.
Indian ICPC Camp 2024 (and scripts to host your own camps!) Greetings Codeforces!
=====================
IIIT Hyderabad Programming Club is excited to announce Indian ICPC Camp 2024, a collaborative effort from top Indian colleges and universities, sponsored by [Databricks](https://www.databricks.com/). This camp offers an excellent opportunity to advance your skills in competitive programming and team contests.
<center>
<img src="https://upload.wikimedia.org/wikipedia/commons/thumb/6/63/Databricks_Logo.png/440px-Databricks_Logo.png">
</center>
**TL;DR**
First contest will be held on September 22. One contest almost every Sunday. The deadline to fill the form is 23:59 IST, 15 September 2024. Scripts for hosting your own camp at the end.
[Registration Form](https://forms.gle/F6Ttn3KnrGyWXcPh7)
[Discord Server](https://discord.gg/W8xv5kfFay)
About ICPC Camp
---------------
### Contests
We have planned ICPC style contests (5 hours, with difficulties corresponding to Indian regionals and higher) over the next 8+ weeks. Eac...
[Registration Form](https://forms.gle/F6Ttn3KnrGyWXcPh7)
140.
ARC Lockout Tournament (Unofficial) Let's hold an ARC Lockout Tournament. The idea is inspired by [user:ecnerwala,2020-11-11]'s Lockout tournaments and [user:kenkoooo,2020-11-11]'s ABC tournaments. This is not an official tournament, so there will be no prize; the winner gets the honor as the champion of the lockout tournament.
The rule is basically the same as [user:ecnerwala,2020-11-11]'s.
- I use the actual points in the contest (like 300-400-500-600-700-800) to judge the winner.
- Only the user with the earlier AC time gets the assigned score (tie-break by submission ID)
- The time penalty doesn't matter.
- In case of tie, the winner is the first one who reached that score (again the tie penalty doesn't matter).
- In case both participants skip the round, the winner is the one with the higher rating at that time.
I don't want to mess up the results of rated participants with this format, so you need to be a red or above on AtCoder. If you want to participate, please reply this thread with your AtCoder ha...
UPD: Thank you for the registration! Now the registration closed.
[Bracket](https://challonge.com
141.
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...
Announcement of Educational Codeforces Round 38 (Rated for Div. 2)
142.
Community-prepared testing rounds Since the two failures of the contests last weekend, a lot of people have expressed that they want to help Codeforces in some way, but there isn't much many of us can actually do about the system. At the same time, there have also been a lot of (reasonable) requests for a testing round before round 656. So let's put those two together. Why don't we set some potential testing rounds? Maybe they should be rated, maybe they shouldn't, but in any case, they should be interesting enough to draw in participants like normal rounds do. It's probably not a good idea to "sacrifice" rounds not rated for Div. 1, as some have suggested, because that still wastes the efforts of the setters. So what I'm suggesting is that we prepare rounds with the specific intent of them being testing rounds.
Some advantages of this system:
- If these rounds are unrated, there's much less pressure for original/novel problems (and probably fewer problems will be rejected), so more of these rounds will be able t...
**UPD:** you can now view the contest in the [gym](https://codeforces.me/gyms).
Registration opens
Announcement of Testing Round #XVII
143.
Eolymp Weekend Practice #2 
On [May 19, at 16:00 UTC](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Eolymp+Weekend+Practice+%232&iso=20240519T16&p1=1440&ah=2) the second [competition](https://basecamp.eolymp.com/en/contests/l2spv0jiqp3ojahlvtfl997vig) of the **Eolymp Weekend Practice** series will take place. Learn more on the [competition website](https://eolymp.com/en/learning/weekend-practice).
### Format and Difficulty
Same as the first round, the competition is primarily aimed at improving practical skills. There will be 5 tasks of varying difficulty, the easiest of which can even be solved by beginners.
The scoring for each task being block-based (meaning points are awarded for each block of tests separately, and only if the solution passes all tests in the block). If there is a tie between two participants, the one whose last productive submission (i.e., a submission that added at least one point) was made ear...
### Registration
144.
[Mirror] IOI 2026 China Mutual Tests As a part of the IOI 2026 China Team Selection, the IOI 2026 China Mutual Tests will be held on [QOJ](https://qoj.ac). The contest is in **IOI format** and opened for everyone.
- Round 1: [contest_time:643561] [registration link](https://qoj.ac/contest/2555)
- Round 2: [contest_time:643562] [registration link](https://qoj.ac/contest/2557)
- Round 3: [contest_time:643563] [registration link](https://qoj.ac/contest/2560)
- Round 4: [contest_time:643564]
Statements will be provided in Chinese only. Each contest is 5 hours long with the IOI ruleset. In other words, you will receive feedback of your submissions, and you can get partial scores.
### Q&A s
**Q: What's the difficulty of the contest? Can I participate if my rating is 1500/2000/2500/3000/4000?**
A: The contest is typically harder than most Domestic/Regional Olympiad. We recommend you to participate in the contest if you can find joys in Codeforces Div. 1 contest.
**Q: Can I use pre-written code / Google / AI ...
- Round 1: [contest_time:643561] [registration
link](https://qoj.ac/contest/2555) - Round 2
145.
InfOJ April Fools Day Contest 2025 (On April 5th) Hello Codeforces!
I am glad to invite you to [InfOJ April Fools Day Contest 2025](http://119.27.163.117/contest/28) (IAFDC for short) which will start on [April 5th 2025, 19:00 UTC+8](https://www.timeanddate.com/worldclock/fixedtime.html?day=5&month=4&year=2025&hour=19&min=00&sec=0&p1=33). The problem setters are me and [user:gyh20,2025-03-22]. This is not a joke: the contest will really be held!
The contest will last for 2.5 hours with 10 tasks for you to solve. All problems are worth 100 points, and the contest will be in IOI mode with standings. You can see the past problems [here](http://119.27.163.117/contests).
## Why is April Fool's Contest not on April Fools Day?
From the year 2023, the contest has always been held on April 5th, to match the Tomb Sweeping Day's break in Chinese schools.
## Language of Problem Statements
We will provide English statements for all problems.
However, in the past several years, only Chinese statements are available. If you wan...
Print your account's registration date. You can see it in your
146.
Eolymp Cup #2 
Eolymp Cup #2
=============
We are very excited to announce [the second round of Eolymp Cup](https://basecamp.eolymp.com/en/contests/ptmnufrm6p6nl7gods1loo65go) on **6th of October at 15.00 UTC**! Take up a challenge to get a chance to win a trophy, medals, prizes, and scholarships at [Harbour.Space University](https://harbour.space/).
**Eolymp Cup** is a programming competition for students. The competition consists of 4 rounds, held throughout the year. Each round features 6 problems, each designed to challenge participants' knowledge of algorithms, data structures and programming.
The competition is open to everyone, but prizes will only be awarded to participants who are born after January 1, 2002. All other participants will compete unofficially.
### Registration
You can register on the [contest page](https://basecamp.eolymp.com/en/contests/ptmnufrm6p6nl7gods1loo65go), just click "Joi...
scholarship at Harbor.Space University" during registration., ### Registration You can register on the [contest
page](https://basecamp.eolymp.com/en/contests, The students should specify a university or a school they are representing
during theregistration
147.
Midnight Code Cup is here <img alt="Neapolis University Pafos" src="/predownloaded/09/67/0967c4495a0c7e09b4854a493404ed57e3fecbe2.png" style="float:right;height: 150px; margin: 10px;"/>
**The Qualification round has started! Cheer for your favourite team:** https://ranker.codeforces.com/ranklist/602915
We’re excited to launch the first-ever Midnight Code Cup (MCC) — a team competition featuring an online Qualification round and a 24-hour onsite Final. Expect algorithmic challenges, optimization puzzles, cutting-edge computer science, and some just plain weird problems. It’ll be exhausting. And fun.
Who are we?
-----------
A team of problem solving <s>geeks</s> <s>veterans</s> enthusiasts, eager for the return of this contest format. The idea of Midnight Code Cup was born at **Recraft.AI** (AI image generation and graphic design pioneers) with huge support from **JetBrains** (creator of Kotlin, intelligent IDEs, and AI-driven developer tools) as well as **Neon** (developer-first open-source database)...
**Update 2:** The registration is open now: https://midnightcodecup.com, **Update 3:** The registration will close on April, 9th, Registration opens soon – you have enough time to find a team. Leave your email
[here](https
148.
Repovive Premier Round 10 — Sponsored by Cognition | $2,550 in Prizes! Hello everyone!
We are back with another Premier round!
Get ready for **Repovive Premier Round 10**. We've prepared an outstanding problem set, ranging from easy to extremely challenging, featuring creative algorithmic ideas and clean, elegant solutions.
This time, expect a **very difficult problem set, even by Premier standards**. And to make things even more exciting, we have **$2,550 in total prizes**, with **$1,850 from Cognition** and **$700 from Repovive**!
Premier rounds are currently the highest level among our contest series. We hope you enjoy the challenge!
* Start Time: [Sunday, 1 November 2026, 14:35 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?iso=20261101T1435&p1=1440&msg=Repovive+Premier+Round+10)
* Duration: $2$ hours, $30$ minutes
...
$ minutes * Registration: https://repovive.com/contests/30
149.
JOI Spring Camp 2022 Online Contest Hello, everyone!
[Japanese Olympiad in Informatics (JOI) Spring Camp 2022](https://contests.ioi-jp.org/joi-sp-2022/index-en.html) will be held from March 20 to March 23. There are **4 days** in this contest.
* Day 1: [March 20, 02:00 GMT — March 20, 24:00 GMT](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Japanese+Olympiad+in+Informatics+%28JOI%29+Spring+Camp+2022+Day1&iso=20220320T02&p1=1440&ah=22)
* Day 2: [March 21, 02:00 GMT — March 21, 24:00 GMT](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Japanese+Olympiad+in+Informatics+%28JOI%29+Spring+Camp+2022+Day2&iso=20220321T02&p1=1440&ah=22)
* Day 3: [March 22, 02:00 GMT — March 22, 24:00 GMT](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Japanese+Olympiad+in+Informatics+%28JOI%29+Spring+Camp+2022+Day3&iso=20220322T02&p1=1440&ah=22)
* Day 4: [March 23, 02:00 GMT — March 23, 24:00 GMT](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Japanese+Olympiad+in+Infor...
The registration page and live scoreboard will be announced 10 minutes before
the contest.
150.
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 ...
> May 7 Arrival
* Registration
151.
California Informatics Competition (CALICO) Spring '24 
**Edit: Registrations have been extended! They will now close 4/26 at midnight PT! Register while you still can!**
Hello Codeforces!
We are excited to invite you to compete in CALICO Spring '24! The contest starts [Saturday, April 27, 2024 at 4:00 p.m. PT](https://timeanddate.com/s/43cu) and will be 3 hours long. **Registrations are now open** and will be until April 26, 2024 at 11:59 p.m. PT, so [register here while you can](https://calico.cs.berkeley.edu/register/)! The contest will take place on our [custom judge platform](https://calicojudge.com/) and for the first time, contestants can compete **online or in-person at UC Berkeley**!
#### In-Person Contest (New!)
The CALICO team is proud to announce our **first in-person contest ever**—that's right, CALICO will be happening **LIVE** at UC Berkeley! We’ll be providing in-person contestants with exclusive merch, dinner, and opening/closing ceremoni...
152.
Eolymp Cup #1 
Eolymp Cup #1
=============
We are very excited to announce our new competition! Join us at [Eolymp Cup](https://basecamp.eolymp.com/en/contests/mufmafu7a932v5ofm9i93q65sc), a programming competition for students from everywhere! Take up a challenge to get a chance to win a trophy, medals, prizes, and scholarships at [Harbour.Space University](https://harbour.space/).
**Eolymp Cup** is a programming competition for students. The competition consists of 4 rounds, held throughout the year. Each round features 6 problems, each designed to challenge participants' knowledge of algorithms, data structures and programming.
The competition is open to everyone and will be held on [Saturday, July 6, 2024 at 17:00 UTC+2](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Eolymp+Cup%231+Round+1&iso=20240706T18&p1=367&ah=3). Still, prizes will only be awarded to participants who are currently enro...
scholarship at Harbor.Space University" during registration., ### Registration You can register on the [contest
page](https://basecamp.eolymp.com/en/contests, The students should specify a university or a school they are representing
during theregistration
153.
The 1st Universal Cup. Stage 9: Qingdao Hello Codeforces! The 9th Stage of the 1st Universal Cup is coming. It will be held from Mar 25th to 26th.
The contest is based on an official ICPC Asia East-Continent regional contest. It has been used in the 2018 ICPC Asia Qingdao Regional Programming Contest, which was prepared by the [SUA Programming Contest Problem Setter Team](https://sua.ac/).
Problem setters: [user:zimpha,2023-03-22], [user:sfiction,2023-03-22], [user:J.T.J.L.,2023-03-22], [user:shb123,2023-03-22], [user:TsReaper,2023-03-22], [user:reku,2023-03-22], [user:fengsuiyan,2023-03-22], [user:ZhouYuChen,2023-03-22], [user:MudCoal,2023-03-22], [user:NeverLand.Dai,2023-03-22].
Testers: [user:chenjb,2023-03-22], [user:oipotato,2023-03-22], [user:Subconscious,2023-03-22], [user:lsmll,2023-03-22], [user:jiangshibiao,2023-03-22], [user:lzw4896s,2023-03-22].
As usual, we have three time windows for participating. You can participate in the contest in the following three time windows:
* Mar 25th 13:00 — ...
Register a new team: https://ucup.ac/register (the registration request will be
processed before
154.
Invitation to 2022 Taiwan NHSPC Mock Contest Hi Codeforces! I am proud to invite you to the online mirror of 2022 Taiwan NHSPC Mock Contest!
The National High School Programming Contest (NHSPC) is an official informatics contest from Taiwan, where the top ten students enter the spring training camp, in which the IOI participants are selected. The NHSPC Mock Contest is a contest prepared by former OI participants from Taiwan, and helps contestants prepare for the official NHSPC which takes place the following week. This year, we have decided to hold an online mirror on Codeforces, so people around the world can participate.
The mirror on Codeforces takes place on [Saturday, December 10, 2022, 9 AM UTC+8](https://www.timeanddate.com/worldclock/fixedtime.html?msg=2022+Mock+National+High+School+Programming+Contest+%28from+Taiwan%29&iso=20221210T09&p1=241&ah=5), and will last for 5 hours until [Saturday, December 10, 2022, 2 PM UTC+8](https://www.timeandd...
UPD: Registration has begun! You can register on the Codeforces Gym.
Announcement of 2022 Taiwan NHSPC Mock Contest
155.
[All UK and Ireland residents] UKIEPC 2025: Spring Practice. Announcement. Hello everyone!
**The contest is for UK and Ireland residents only. If there will be an opportunity we will hold the mirror.**
**Please note that anyone from the UK and Ireland are welcome to participate, not just university students!**
We would like to announce “UKIEPC 2025: Spring Practice” programming contest which will be held online at 12:00-14:30 pm, 19 April. Our main goal is to promote programming for everyone in the UK and Ireland.
Compared to the previous year, we do not have any limits on the rating of the participants. However, we do not suggest very experienced participants to participate (close to the target rank on Codeforces, 2700+), since it would not be that interesting. If you are unsure whether you should participate or not, please contact [us]([email protected]).
**Contest.**
The date is 19th of April. The start time is 12:00. The duration is 2:30.
The contest is in teams of two people (or solo) and each team can use two computers.
The contes...
**Registration.**
156.
JOI Spring Camp 2023 Online Contest Hello, everyone!
[Japanese Olympiad in Informatics (JOI) Spring Camp 2023](https://contests.ioi-jp.org/joi-sp-2023/index-en.html) will be held from March 19 to March 22. There are **4 days** in this contest.
* Day 1: [March 19, 02:00 GMT — March 19, 24:00 GMT](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Japanese+Olympiad+in+Informatics+%28JOI%29+Spring+Camp+2023+Day1&iso=20230319T02&p1=1440&ah=22)
* Day 2: [March 20, 02:00 GMT — March 20, 24:00 GMT](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Japanese+Olympiad+in+Informatics+%28JOI%29+Spring+Camp+2023+Day2&iso=20230320T02&p1=1440&ah=22)
* Day 3: [March 21, 02:00 GMT — March 21, 24:00 GMT](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Japanese+Olympiad+in+Informatics+%28JOI%29+Spring+Camp+2023+Day3&iso=20230321T02&p1=1440&ah=22)
* Day 4: [March 22, 02:00 GMT — March 22, 24:00 GMT](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Japanese+Olympiad+in+Informatics+%28JOI%29+Spring+C...
The registration page and live scoreboard will be announced 10 minutes before
the contest.
157.
The 1st Universal Cup. Stage 14: Ranoa Hello Codeforces! The 14th Stage of the 1st Universal Cup is coming. It will be held from Apr 29th to 30th.
The contest was used in the Osijek Competitive Programming Camp 2023 Winter. If you have solved any problems from the last day of the camp, please skip this round. Teams that participated in the camp can have their camp results included in the final standings.
All problems are authored and prepared by me.
I want to thank
- all testers for greatly improving the quality of the contest: [user:edenooo,2023-04-28] [user:brunovsky,2023-04-28] [user:-is-this-fft-,2023-04-28] [user:ainta,2023-04-28] [user:nweeks,2023-04-28] [user:fishy15,2023-04-28] [user:QuickSortTLE,2023-04-28] [user:nmnsharma007,2023-04-28] [user:TAMREF,2023-04-28],
- Osijek Camp organizers for hosting such an amazing camp, and
- Universal Cup committee for providing the opportunity to share this contest with a wider audience.
As usual, we have three time windows for participating. You can participate...
Register a new team: https://ucup.ac/register (the registration request will be
processed before
158.
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...
starting registration., **Registration**
159.
Invitation to TheForces Round #35 (LOL-Forces, TheForces Rated, Prizes!) Hello, Codeforces!
We are happy to invite you to [**TheForces Round #35 (LOL-Forces)**](https://codeforces.me/contestInvitation/8be905e8de4e2c21c4b77958fdf39d6cfc672bf2), which will take place on **[contest_time:105390]**
**Registration is open!**
<spoiler summary="What is TheForces Round?">
TheForces is a project uniting individuals with a shared interest in competitive programming contests. You can join our discord server with more than $2500$ members to communicate with founders and members of TheForces.
In the other words TheForces rounds are series of educational contests for beginners to masters which are created by a group of CP lovers in the CF community, It's where anyone can propose and prepare his own interesting problems and receive money!
Not to mention that we've already created **two** official codeforces Div($1 + 2$) rounds before ;) So join us now!
[Discord link](https://discord.com/servers/theforces-901910143342608405)
[TheForces website](http...
**Registration is open!**
Announcement of TheForces Round #35 (LOL-Forces)
160.
Indian ICPC Camp 2025 Greetings Codeforces!
---------------------
Indian ICPC Camp 2025, proudly sponsored by Go For Gold (powered by NST), is organized jointly by leading Indian institutes including IITs, NITs, IIITs and BITs. This camp is a continuation of last year’s massively successful edition, which saw participation from over 3000 teams across India.
## Schedule
Contest window: 31 August 2025 – 19 October 2025
Contests every Sunday, 2 PM – 7 PM IST (unless otherwise mentioned via Discord/WhatsApp).
First contest: 31 August 2025.
Ranklist freeze after 4 hours.
## Educational Sessions
Alongside contests, we’ll host topic-focused sessions by some of India’s best competitive programmers — including ICPC World Finalists and Codeforces Grandmasters. These will cover advanced algorithms, data structures, and problem-solving strategi...
[Registration Form](https://forms.gle/1MnRL15DtrXckoeG9) (only one participant
per team should register
161.
Eolymp Weekend Practice #9 
On Aug 23, at 12:00 UTC the ninth [competition](https://basecamp.eolymp.com/en/contests/3hdr42rsv164r0602arq87cfu8) of the **Eolymp Weekend Practice** series will take place. Learn more on the [competition website](https://eolymp.com/en/learning/weekend-practice).
### Format and Difficulty
Same as the first round, the competition is primarily aimed at improving practical skills. There will be 5 tasks of varying difficulty, the easiest of which can even be solved by beginners.
The scoring for each task being block-based (meaning points are awarded for each block of tests separately, and only if the solution passes all tests in the block). If there is a tie between two participants, the one whose last productive submission (i.e., a submission that added at least one point) was made earlier will be ranked higher in the leaderboard.
This series has a standard duration of two hours.
The statements wi...
### Registration
162.
Online judge with IOI problem went public Hello everyone.
Two years ago there was a post titled "Submitting IOI problems" and [my comment](/blog/entry/10967#comment-161620) there. I offered everyone to contact me via PM on Codeforces to get the access and be able to solve problems from past IOIs (starting with IOI 2003). What was important here is that [user:PavelKunyavskiy,2016-06-12] and me took effort and made the system as similar to what was used on particular IOI as we could, including:
1. Original tests from archives
2. Tests grouping and correct subtasks scoring where applicable — you won't get 54 points if there are subtasks for 40 and 60 points — just like on IOI.
3. Interactive problems with interactive I/O (say, "Aliens" from IOI 2007 or "Maintain" from IOI 2003)
4. Partial scoring where you can get only a fraction of points per test, like "Reverse" from IOI 2003 or "Hotter Colder" from IOI 2010.
5. "Encode-decode" problems, where your solution is executed several times in separate processes, ...
, but the registration is open for everyone and IOI 2015 is available there.
Feel free to join!
163.
Discussion: Rating Changes Caps Hello, Codeforces!
I carefully read most of the ideas that are written in the comments and posts. I have no way to answer everything. Otherwise, I would only do what I answered. Excuse me. There are many good ideas, some easier to implement, some more difficult.
The following idea seems vivid to me. Idea is to limit the maximum rating increase for rounds where there is already an upper rating limit at registration. For example, if the upper limit is $u$, then your rating after participating in the round cannot be higher than $u+100$ even with a very successful performance. For example, after winning in Div.3 round the rating can't be more than $1699$.
It is easy to implement, it does not entail a significant redistribution of ratings. It seems I like it. What do you think about it?
Actually, probably a good idea is to make a bottom cap for rating changes: in any case of any (even the worst) performance, the rating shall not fall by more than $100$. Еverything happens durin...
there is already an upper rating limit at registration. For example, if the
upper limit is $u
164.
Huawei IOI/EGOI/CEOI/etc. Camp 2025 [registration started] - [2022 recordings](https://www.youtube.com/playlist?list=PLg_Krngrs0eC_1vn0dTjyPZMkwBOcVsgH) — CEOI 2016, CEOI 2017, CEOI 2022, optimization problems, segment tree nodes
- [2023 recordings](https://www.youtube.com/playlist?list=PLg_Krngrs0eAN_QrR5MKnaZROHVSCaQiL) — POI 2019, POI 2022, CEOI 2018, graphs
- [2024 recordings](https://www.youtube.com/playlist?list=PLg_Krngrs0eCfvefczNWB-c-Af3BUSH0x) — POI 2016, POI 2019 mix, POI 2023, IOI 2014, lazy propagation, sweep line, partial dp/bfs (Bombs)
Hi! For a fourth time, I'm organizing an online IOI camp sponsored by Huawei. It's free for IOI participants and coaches. **UPDATE**: we will accept participants of regional olympiads too (from this year, so e.g. BOI/EGOI/CEOI/APIO 2025)! Every day will be a 5-hour virtual contest, the problem analysis, and sometimes a lecture.
- Dates: 17-23.07 (6 training days; Sunday off)
- Contests: IOI 2015, POI 2024 and something else from POI/BOI/CEOI
- **[EDIT]** Registration: Y...
Huawei IOI/EGOI/CEOI/etc. Camp 2025 [registration started], from POI/BOI/CEOI - **[EDIT]** Registration: You need to register using this
form https, off) - Contests: IOI 2015, POI 2024 and something else from POI/BOI/CEOI -
**[EDIT]**Registration
165.
Eolymp Weekend Practice #1 Announcement 
Next Sunday, [March 24, at 16:00 UTC](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Eolymp+Weekend+Practice+%231&iso=20240324T16&p1=1440&ah=2) the first [competition](https://basecamp.eolymp.com/en/contests/n4rbvsi2lt50t4b1h0ccl1oi3c) of the **Eolymp Weekend Practice** series will take place.
Format and Difficulty
---------------------
As the name suggests, this series of competitions is primarily aimed at improving practical skills. There will be **5 tasks** of varying difficulty, the easiest of which can even be solved by beginners.
The distribution of points by tasks is 50-100-200-300-350, with scoring for each task being block-based (meaning points are awarded for each block of tests separately, and only if the solution passes all tests in the block). If there is a tie between two participants, the one whose last productive submission (i.e., a submission that added at least one poin...
Registration ------------
166.
Infoleague Spring Round 2022 Announcement Hello Codeforces!
We would like to invite you to the first (and possibly only) round of Infoleague Spring 2022, the contest starting on Wednesday, March 30th from [12:30 GMT+3](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Infoleague+Spring+2022+Official+Round&iso=20220330T123030&p1=2209&ah=4). The problems in this round have been prepared to train high school students for the upcoming Romanian National Olympiad in Informatics (ONI).
**The registration period for this contest starts from [6:30 GMT+3](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Infoleague+Spring+2022+Official+Round+Registration&iso=20220330T0630&p1=2209&ah=6) on Wednesday, March 30th**.
This contest has two divisions, Div 1 and Div 2. The Div 2 contest intends to mimic an ONI problemset for 9th and 10th graders, while Div 1 is mainly focused towards challenging 11th and 12th graders.
Contest links: [Div1](https://codeforces.me/gym/103634), [Div2](https://codeforces.me/gym/1036...
**The registration period for this contest starts from [6:30
GMT+3](https://www.timeanddate.com
Announcement of Infoleague Spring 2022 Round Div. 2
Announcement of Infoleague Spring 2022 Round Div. 1
167.
Call for Problemsetters: Osijek Competitive Programming Camp, Summer 2023 Hi everyone!
<center><img src="https://ocpc.mathos.unios.hr/images/ocpc.svg" height="80px"></center>
After a successful [camp in February](https://codeforces.me/blog/entry/113438), we are excited to announce that Osijek camp will be returning this **September**. Precise dates and registration details will be announced later, but for now, we are looking for contests and problemsetters.
To apply, contact us at **ocpc (at) mathos (dot) hr** or contact me ([user:-is-this-fft-,2023-05-29]) or [user:adamant,2023-05-29] directly. Specific compensation might depend on how successful we are with sponsors and participation fees. As a reference point, last time, we offered **2000€** per contest. Note that the compensation is subject to Croatian income tax (around 25%).
You don't need to have enough ideas for a full problemset yet, but you should have a somewhat good idea of what your contest is going to be, i.e. you should have at least 6-7 problem ideas already.
The most important ...
announce that Osijek camp will be returning this **September**. Precise dates
andregistration
168.
2018-2019 ACM-ICPC, Asia Jiaozuo Regional Contest (Online Mirror on Gym) Greetings!
<strike>Ugh! That guy comes with another online-mirror and ruins my timeline again.</strike>
Here is the last one this year I could share with you, [contest:102028]. It will start on [Saturday, December 8, 2018 at 17:00 (UTC+8)](https://www.timeanddate.com/worldclock/fixedtime.html?day=8&month=12&year=2018&hour=17&min=0&sec=0&p1=33) and last for **5 hours**. You are able to register 6 hours before the contest starts. However, before the registration starts, you may not view this contest on Gym. By the way, other Asia east continent regional contests shared by my friends and I could be found at [Nanjing](https://codeforces.me/gym/101981), [Shenyang](https://codeforces.me/gym/101955), [Qingdao](http://acm.zju.edu.cn/onlinejudge/contestInfo.do?contestId=381), [Beijing](http://hihocoder.com/contest/icpcbeijing2018) and [Xuzhou](https://codeforces.me/gym/102012).
This onsite contest was held by Henan Polytechnic University on November 25th. It is the first time one re...
**UPD3:** Registration starts. You may [view this
page](https://codeforces.me/gymRegistration
169.
The 2nd Universal Cup. Stage 21: Delft Hello everyone! I'm happy to announce the 21th stage of the 2nd Universal Cup. It will be held from February 3 to February 4. You can choose between one of seven possible time windows.
Problems were authored and prepared by me. This means there will be $>0$ geometry problems. I also guarantee that there will be $>0$ non-geometry problems. I would like to thank [user:errorgorn,2024-01-31] and [user:Um_nik,2024-01-31] for testing and useful feedback, as well as all of the Universal Cup staff for hosting the contest.
This contest was originally used in the Osijek Competitive Programming Camp Fall 2023. If you participated, please refrain from participating in this stage of the Universal Cup. I would also like to thank [user:adamant,2024-01-31] and [user:-is-this-fft-,2024-01-31] for organizing the camp and helping me with many small things.
<spoiler summary="About Universal Cup">
Universal Cup is a non-profit organization dedicated to providing trainings for competitive program...
registration request will be processed before each stage) Results of past
stages: [https://ucup.ac
170.
Group functionality update <img style="margin: 0 1em 1em 1em; float: right" src="http://assets.codeforces.com/images/updates.jpg"/>
Hello, Codeforces.
Today group functionality was updated and extended:
Here is a list of changes:
- Personal blog entries now can be attached to the group blog.
- New blog entries can be written directly to the group blog. Such entries won’t be displayed in recent actions and votes for it or for it’s comments will not affect contribution.
- Only managers can write or attach entries to the group blog. Entries can be read by and commented by all group members.
- New group role was added. Now there are three group member types: spectator, participant and manager. Spectator is a group member, which can not register to the group contest and is not displayed in group standings. But spectator can see the standings, see the problems, read and comment group blog. For example, if you want someone to see the trainings of the group, but not to participate, you can invite t...
- Spectator registration policy can have same values as participant registration
policy. Spectator
171.
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...
). If you already registered as rated participant you can change registration
type [here] (https
Announcement of Codeforces Round 970 (Div. 3)
172.
Code For Athoy — Contest for Saving a Life 
### Code For Athoy — Contest for Saving a Life
Hi everyone,
I hope you find this post in good health.
A 17 years old brother(Athoy) of ours is **fighting with blood cancer** and his family is going through a stage where they can't bear the expense of his treatment anymore after managing 9 out of 12 chemotherapy.
We are arranging an online programming contest nationwide for collecting funds for the treatment to continue.
His family needs around 250,000tk(about 3,000$) for the next Chemotherapy and more in upcoming days.
Currently, they're not being able to manage any reasonable help from other sources during this COVID-19 pandemic and selling out their last of the assets and belongings. We've been informed that Athoy needs three more chemotherapy till next year and completed the first installment for the next chemotherapy planned on 7-8th of June 2020. So, **for now we are plan...
/yd1SQmfK4BLaVT86A) after your donation**. The contest registration can be
completed through the same form
173.
The 2nd Universal Cup. Stage 13: Shenyang Hello! I'm happy to announce The 2nd Universal Cup. Stage 13: Shenyang, which will be held on December 9th, 2023.
This contest is an official ICPC Regional Contest — The 2023 ICPC Asia Shenyang Regional Contest. It is the 9th consecutive year that Northeastern University has hosted the ICPC Asia Shenyang Regional Contest. Great thanks to the host school for preparing the Regional, and the hard work done by all staff and volunteers for this contest.
<img src="/predownloaded/24/83/2483ceaf571339751e32ed2e5401c5d08bd6db18.jpg" width="35%" height="35%" /> <img src="/predownloaded/e3/fb/e3fb46fa993b6b46dadb89ee7b0aac495abb5d29.jpg" width="27%" height="27%" /> <img src="/predownloaded/00/8c/008c2d13555c6d9b32427762cc02559356f52e08.jpg" width="35%" height="35%" />
The authors for preparing the contests: [user:Sulfox,2023-12-06], [user:quailty,2023-12-06], [user:lzr_010506,2023-12-06], [user:calabash_boy,2023-12-06], [user:Gromah,2023-12-06].
The testers for their valuable advice: ...
Register a new team: https://ucup.ac/register (the registration request will be
processed before
174.
Stanford Local Programming Contest 2026 **Edit: Registration deadline extended by 12 hours -- to 9PM pacific time today!**
Hello Codeforces!
We ([user:ritwin,2026-03-26], [user:nikilrselvam,2026-03-26], [user:spycoderyt,2026-03-26], [user:lethan3,2026-03-26], [user:Mokuroh54,2026-03-26], [user:andy0liang,2026-03-26], [user:applepi216,2026-03-26], [user:bitset,2026-03-26], [user:minifinity,2026-03-26]) are excited to announce the
**Stanford Local Programming Contest (SLPC 2026)** — a 3-hour ICPC-style team contest with
**over $3,000 in prizes**!
SLPC has historically been Stanford's internal contest and ICPC team tryout. This year, we're
opening it up to the broader competitive programming community.
- **Date:** Saturday, April 4, 2026
- **Local Division:** In-person at Gates 403, Stanford students only -- lunch and boba provided!
- **Open Division:** Online, open to everyone
- **Registration deadline:** April 2, 2026 at 8:59 PM PDT
## Links
- [Website](https://cs.stanford.edu/group/acm/slpc/)
- [Regist...
## Links - [Website](https://cs.stanford.edu/group/acm/slpc/) - [Registration
](https://forms.gle, **Edit: Registration deadline extended by 12 hours -- to 9PM pacific time
today!**
175.
Codeforces: Championships and Rounds by Companies 2015 Hello everybody!
I hope you have the holiday spirit!
Later I will publish statistics for the year and tell you about our achievements of this year, and for now I will talk about
championships and competitions that we made with our partners in 2015. My speech does not include any activities that we
have conducted very far from the Codeforces site (e.g., [Russian AI Cup](http://russianaicup.ru/)).
This year is remembered by many interesting events that we did not by ourselves, but together with partners. I am particularly pleased
that all companies who wished to fill the ranks of their employees found worthy candidates among our members. And
someone said that the Olympiads are not needed! That is a lie. Here is the list of events:
<hr>
## [VK Cup 2015](http://codeforces.me/vkcup2015)
Team Championship for young participants, was conducted in Russian. 2349 registered...
176.
solved.ac Grand Arena #3 Announcement Hi, I am [user:TheQueenOfHatred,2023-11-12], staff of [solved.ac](https://solved.ac/en). It's been a while!
We will hold solved.ac Grand Arena Round 3. ([Division 1](https://www.acmicpc.net/contest/view/1197) / [Division 2](https://www.acmicpc.net/contest/view/1198))
- **Time**: https://www.timeanddate.com/worldclock/fixedtime.html?iso=20231126T14&p1=235&ah=3, 180 minutes
- **Problems**:
- **Division 1**: 7-8, in ICPC format
- **Division 2**: 7-8, in ICPC format
- **Difficulty**:
- **Division 1**: **Problems A and B are the first and second easiest problems expected by the jury.** The order will be random except for problems A and B.
- **Division 2:** Problems are sorted ascending by the difficulty expected by the jury.
- **Penalty**: 20 minutes; The scoreboard will freeze 30 minutes before the contest ends. Compilation errors do not count toward penalties.
- **Scoreboard**: ICPC style. The contestant with more solves is ranked in a higher place. If two c...
starts. You can cancel registration anytime before the contest begins. - You
can participate in the
177.
Invitation to the 2020 Lockout Championship Hi all!
I'm pleased to announce the **2020 Lockout Championship**, a lockout tournament that will be held over the next few weeks on Discord.
A full description of the tournament and a link to register are on the tournament Discord, but the gist is pretty simple: I'm running an open Lockout tournament for all interested competitors. **All interested players will be allowed to compete.** Matches will be run on the Discord Lockout Bot. The tournament will consist of a double elimination bracket. There are separate brackets for lower-rated competitors so that everyone has access to balanced matches, but anyone is welcome to join a bracket above their rating, should they want to do so. More specifics are on the Discord server.
For the first few rounds, matches will be scheduled between you and your opponent, but when we're down to the last few participants, the final rounds will be held live (and will hopefully be streamed on YouTube).
If you're interested in competi...
Registration is open on the server; to compete, you must register by 5 PM UTC
on Saturday, August
178.
Invitation to join the NOI.PH 2020 Final Round Mirrors at the Codeforces Gym! Links to the mirrors! [day 1](https://codeforces.me/gym/102687), [day 2](https://codeforces.me/gym/102688) (Please register at [the gym](https://codeforces.me/gyms))
Hello Codeforces!
I'd like to invite you to the mirrors of the 2020 final rounds of the National Olympiad in Informatics – Philippines. The mirrors will be held in the Codeforces gym. The NOI.PH is the Philippines' qualifier for the IOI.
**Contest format:**
- There are 2 contest days.
- There are 5 problems over 5 hours, per day.
- The problems will have subtasks. The maximum score for each problem will be 100 points.
- Some problems may have special scoring rules which will be indicated in the statement.
- The submission that achieves the maximum score is counted towards the final ranking.
- The problems range from easy to hard. We also tried to cover a diverse set of topics.
- Editorials will be released after the mirror contests end.
- **Day 1 mirror:** August 15, 2020 4pm UTC+8 (8am UTC) to 9pm UT...
**Edit:** The registration is now open for Day 1!
179.
CodeNite 2025, organized by CodeClub, IIT Kharagpur (Prizes ;-)) Greetings, Codeforces! <img src="/predownloaded/55/03/55037de3cc6d5d569d1ea9854716cff534d33510.png" width="20%" height="20%" align="right">
We, [CodeClub IIT Kharagpur](https://www.facebook.com/CodeClub.IITKGP/) bring to you second edition of CodeNite 2025. a competitive programming contest with individual participation to be<img src="/predownloaded/a9/b7/a9b76a85ac9f96d240e38f4091e3e331a28016cf.png" width="20%" height="20%" align="right"> held on Codeforces, sponsored by [Intercollegiate Informatic and Competitive Programming Camp private limited(IICPC India)](https://iicpc.com/). This contest is OPEN TO ALL, irrespective of college, year of study, or department. The top performers may get referred to top quants partnered with IICPC India. The problemset is aimed to have difficulty of a Codeforces Div. 2 round.
**Details are as follows:**
- Date: Sunday, 26th October 2025
- Time: [14:00 to 16:00 IST (GMT +5:30)](https://www.timeanddate.com/worldclock/fixedtime.html?msg=C...
**UPD2:** Contest registration has begun. You can click on the [contest
link](https
180.
Olympiad Classes by Harbour.Space Hi. I'm excited to announce my partnership with Harbour.Space, which will include free Olympiad classes!
I will teach two groups:
- **Easy**: A course on competitive programming. You'll learn and practice algorithms, including topics from the USACO Guide [Silver](https://usaco.guide/silver) and [Gold](https://usaco.guide/gold). Prerequisites: C++, BFS, DFS, binary search.
- **Hard**: We will mostly solve Olympiad problems, and cover topics from the USACO Guide [Platinum](https://usaco.guide/plat) and [Advanced](https://usaco.guide/adv). This group is aimed at students who want to get an IOI medal.
The first semester will last from September until December, around 15 classes per group.
As an optional pre-course, the Easy group will start next week (17.08.2026) with a few introductory classes in the second half of August.
- Time: Mondays (Easy) and Tuesdays (Hard) at [16:00-17:30 CEST](https://www.timeanddate.com/worldclock/fixedtime.html?iso=20260901T16&p1=262&ah=1&am=30...
/worldclock/fixedtime.html?iso=20260901T16&p1=262&ah=1&am=30) - Registration:
https://harbour
181.
Repovive Math Contest Round 1 — Combinatorics Hello everyone!
After the **Repovive Math Contest Grand Opening**, we are back with our second live math contest!
This round will be entirely about **Combinatorics**.
Our goal is still the same: to bring the experience of competitive programming contests to proof-based mathematics. You solve a problem, write your proof, submit it, get a live verdict, and compete on a live leaderboard.
The next contest will be **Repovive Math Contest Round 1**, held this Tuesday.
* Start Time: [Tuesday, 6 October 2026, 14:35 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?iso=20261006T1435&p1=1440&msg=Repovive+Math+Contest+Round+1)
* Duration: $2$ hours, $30$ minutes
* Problems: $5$ combinatorics problems
* Points: $500,\ 1000,\ 1500,\ 2000,\ 2500$
* Registration: https://repovive.com/contests/m1
The contest is **rated for everyone**.
### What changed after the first contest?
After our first math contest, we selected **534 borderline submissions** and graded them...
$ * Registration: https://repovive.com/contests/m1
182.
JetBrains Youth Coding Club 2026 Hello, Codeforces!
We start a new season of the [Coding Club](https://lp.jetbrains.com/youth-coding-club/)! This year, things will be different from the last one. Every week, [user:livlivi,2026-10-26] and I will post a short lecture and a themed contest. Then you will have one week to solve it. If you have any troubles, we will have several teaching assistants, who will help you personally.
The plan for this season is to cover these topics (not sure if we will have enough time, but we will try):
* Core techniques (prefix sums, binary search)
* Dynamic programming
* Graph algorithms (DFS, BFS, MST, shortest paths)
* Data structures (stacks, queues, DSU, segment trees)
* Tree algorithms (DP on tees, LCA)
* String algorithms (tries, KMP, hashing, Aho–Corasick)
The club is starting this week! If you are interested, register [here](https://lp.jetbrains.com/youth-coding-club/#registration). See y...
/youth-coding-club/#registration). See you!
183.
The 2nd Universal Cup. Stage 27: India Hello everyone! I'm happy to announce the 27th stage of the 2nd Universal Cup. It will be held from April 6 to April 7. You can choose between one of seven possible time windows.
The problems were originally used in the ICPC Contests prepared by our team. Namely (ICPC India Online Round, Kanpur Regional, Chennai Regional, Amritapuri Regional, and Asia West Continent Final). If you participated, please refrain from participating in this stage of the Universal Cup.
We are planning to organise one more stage using the remaining contest problems.
**Setters and Testers:** ~kevinsogo,2024-04-04 ~Shisuko,2024-04-04 ~jtnydv25,2024-04-04 ~IceKnight1093,2024-04-04 ~aryanc403,2024-04-04 ~dragonado,2024-04-04 ~xennygrimmato,2024-04-04 ~ritul_kr_singh,2024-04-04 ~kshitij_sodani,2024-04-04 ~PraveenDhinwa,2024-04-04 ~Vichitr,2024-04-04 ~mexomerf,2024-04-04 ~JaySharma1048576,2024-04-04 ~t1dus,2024-04-04 ~magga,2024-04-04 ~rivalq,2024-04-04
We w...
Register a new team: https://ucup.ac/register (the registration request will be
processed before
184.
HPI 2024 Tomorrow! [3/9/2024, $1000+ PRIZES, In-person/Online Mirror] Hi Codeforces,
The Harker Programming Club is excited to welcome you to participate in the annual Harker Programming Invitational taking place on [March 9th, 2024](https://www.timeanddate.com/worldclock/fixedtime.html?day=9&month=3&year=2024&hour=19&min=30&sec=0&p1=166) at The Harker School, with an online mirror available for virtual participation. The theme of our contest this year will be “CS & Transportation.”
Contest Information
==================
The contest will last **2 hours** and be split into novice and advanced divisions. Participants may form teams of up to **3 people**. The contest will be open internet and ICPC style.
Registration for in-person is available [here](https://tiny.cc/hpi2024).
The online mirror will be available [here](https://codeforces.me/group/Kb6sgaFfJH).
The problems were all created and prepared by [user:oursaco,2024-02-21], [user:bossbobster,2024-02-21], [user:rowlet1,2024-02-21], [user:jchen05,2024-02-21], [user:kujousara,2024-02...
- 8:00 — 8:30, Registration, Registration for in-person is available [here](https://tiny.cc/hpi2024).
185.
IOI 2021 will be held online **TL;DR:** IOI 2021 was planned to held on-site with strong safety measures. Today, IC announced to turn it into an on-line contest (I guess due to travel difficulties). The IC is exploring the possibility of an optional on-site contest.
https://www.facebook.com/ioinformatics.org/posts/458218468862628
Dear Friends of IOI,
I hope you are doing well as COVID-19 is still rampaging all over the world. But as vaccines are becoming available, I hope we can all soon get back to our normal life before the pandemic.
The IC held the Winter meeting in late February. We have the following important information regarding IOI 2021 to share with the community.
First, IOI 2021, organized by Singapore, will still be an online competition much like the previous year. The competition week will fall between mid to late June.
Second, competition aside, in an effort to bring back some normalcy, IOI business will be conducted as usual. This includes collection of registration fees an...
as usual. This includes collection of registration fees and election of new
committee members.
186.
2023 KSAAC Summer · solved.ac Arena #4 Announcement Hi, I am [user:TheQueenOfHatred,2023-08-15], staff of [solved.ac](https://solved.ac/en).
We will hold 2023 KSA Automata Summer Contest · Arena #4. The problems are prepared by Automata, algorithmic problem solving research group of [Korea Science Academy of KAIST](https://www.ksa.hs.kr/Eng).
- Time: https://www.timeanddate.com/worldclock/fixedtime.html?iso=20230818T1930&p1=235&ah=4&am=30 270 minutes
- No. of Problems: 10, 100 points each = 1000 points total
- The questions are sorted in order of difficulty expected by the jury.
- **Statements are available in both English and Korean.**
- Every problem has **partial points**.
- The scoreboard will freeze 60 minutes before the contest ends.
- There are bonus time/memory limits for some languages. Check [here](https://help.acmicpc.net/language/info) for details.
- Editorial will be posted after the contest ends.
Please refer to the following guide for registering in the Arena contest:
- https://help.solved.ac/en/arena/g...
registration anytime before the contest begins. - You can participate in the
Arena without registering. In
187.
Newton's Grand Contest 2022 Invite <b>Edit</b>: The problems have been opened for practice, the [editorials](https://codeforces.me/blog/entry/101122) have been published!
Warm greetings,
[Newton School](https://www.newtonschool.co/grandcodingcontest) cordially invites you to be a part of our [Newton's Grand Coding Contest](http://bit.ly/NSGrandContest_CF). The challenge will go live on **31st March 2022 at 9 PM IST**. Do register for the contest and stand a chance to win cash prizes worth **₹1,000,000** and exciting goodies like **AirPods 3rd Gen, Amazon Echo 4th Gen, boAt Airdopes 131, ergonomic keyboards, [Newton School](http://bit.ly/NSGrandContest_CF) exclusive merchandise** (T-shirts, sippers, notebooks, stickers, etc.)
<p>
Registration Link: [Newton's Grand Coding Contest](http://bit.ly/NSGrandContest_CF) — we have already caused 100,000 registrations.
<p>
You will be given **8 problems** and **180 minutes** to solve them. The contest will be <b>rated</b> for all! The initial problems are high...
Registration Link: [Newton's Grand Coding
Contest](http://bit.ly/NSGrandContest_CF) — we
188.
Register for the Montgomery Blair Informatics Tournament (mBIT) 2020 Fall Round! If you are interested in participating in the **Montgomery Blair Informatics Tournament (mBIT)**, which will be held online from [12:00-4:00 PM EST](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Montgomery+Blair+Informatics+Tournament+%28mBIT%29+Fall+2020+Round&iso=20201114T12&p1=263&ah=4) on **Saturday, November 14 (11/14/20)**, please register at https://mbit.mbhs.edu/. The contest will be hosted on our personal servers at https://mbit.live/. All problems were written by the [Montgomery Blair HS Computer Team](https://codeforces.me/ratings/organization/2457), including [user:12tqian,2020-10-28], [user:gabrielwu,2020-10-28], [user:galen_colin,2020-10-28], [user:smax,2020-10-28], [user:meiron03,2020-10-28], [user:Blastman,2020-10-28], [user:czhang2718,2020-10-28], and [user:csytrn,2020-10-28]. Special thanks to [user:balbit,2020-11-12] for spending hours test solving our hardest problems!
mBIT is split into two divisions: **Standard** and **Advanced**. Teams may choose ...
](https://mbit.mbhs.edu/)**. Registration will remain open up until the day of
the contest.
189.
CodeSprint LA 2026 Hello, Codeforces!
We’re excited to invite you to participate in [CodeSprint LA 2026](https://codesprintla.uclaacm.com/), ACM ICPC at UCLA's annual beginner-friendly algorithms contest, scheduled for [Saturday, May 9, 2026, 10 am — 5 pm PDT](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CodeSprint+LA+2026&iso=20260509T10&p1=137&ah=7)!
**The contest itself runs from [Saturday, May 9, 2026, 11:30 am — 4:30 pm PDT](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CodeSprint+LA+2026+Contest&iso=20260509T1130&p1=137&ah=5)**
[Registration is open here](https://codesprintla.uclaacm.com/register)! More information, rules and the schedule are available on the [contest website](https://codesprintla.uclaacm.com/). **The registration deadline is [Sunday, May 3, 2026, 11:59 pm PDT](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CodeSprint+LA+2026+Registration&iso=20260503T235959&p1=137)!**
This year, we are excited to announce:
- A 5-hour team competit...
[Registration is open here](https://codesprintla.uclaacm.com/register)! More
information, rules and
190.
Repovive Math Contest Round 2 — Combinatorics & Algebra Hello everyone!
We are back with another live Math Contest on Repovive!
After two rounds focused on combinatorics, we are expanding the problem set. This time, the contest will feature problems from **both Combinatorics and Algebra!**
Our goal is to bring the excitement of competitive programming contests to proof-based mathematics. You solve problems, write your proofs, submit them for live judging, and compete on a live leaderboard.
Whether you enjoy clever algebraic ideas or beautiful combinatorial arguments, we hope you will find something interesting in this round!
* Start Time: [Sunday, 18 October 2026, 13:35 (UTC)](https://www.timeanddate.com/worldclock/fixedtime.html?iso=20261018T1335&p1=1440&msg=Repovive+Math+Contest+Round+2)
* Duration: $2$ hours, $30$ minutes
* Problems: $5$
* Points: $500,\ 1000,\ 1500,\ 2000,\ 2500$
* Registration: https://repovive.com/contests/m2
The contest is **rated for everyone**.
### Rules and judging
The rules are current...
$ minutes * Problems: $5$ * Points: $500,\ 1000,\ 1500,\ 2000,\ 2500$ *
Registration: https
191.
Community Petition on Combating Cheaters Recently, cheating has become a more and more serious issue over time. Many community members have come up with various ideas for combatting cheaters better. I think I can make a summary.
There are votes option for each point. Click the upvote button if you like it.
## Prevention
- Enable "trusted participant" system for Div.1, Div.2, Div.1 + 2 and Educational rounds.
- Use phone number verification for registration. (which has been rejected by Mike in his recent blog to some extent, but I'll let it be here anyway)
- Use hardware level detection software.
- Completely ban the usage of AI.
- Use a new type of problem in which the usage of AI is marked as not cheating and there could still be much fun for human solvers, even with the assistance of AI.
## Detection
- Train anti-cheating specialized LLM and use it for cheating detection.
- Add a report option for each user for manual review.
...
] - Use phone number verification for registration. (which has been rejected by
Mike in his recent
192.
Educational Codeforces Round 47 [Rated for Div. 2] Hello Codeforces!
On [contest_time:1009] Educational Codeforces Round 47 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 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 invented and prepared by Ivan [user:BledDest,2018-07-13] Androsov, Vladimir [user:Vovuh,2018-07-13] Petrov, Maksim [user:Ne0n25,2018-07-13] Mescheryakov, Aslan [user:ag2cidk,2018-07-13] Tamaev and me.
Good luck to all participants!
...
registration for the boot camp!
Announcement of Educational Codeforces Round 47 (Rated for Div. 2)
193.
Educational Codeforces Round 49 [Rated for Div. 2] On [contest_time:1027] Educational Codeforces Round 49 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 extented ACM 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 **7 problems** and **2 hours** to solve them.
The problems were invented and prepared by Vladimir [user:Vovuh,2018-08-17] Petrov, Adilbek [user:adedalic,2018-08-17] Dalabaev, Ivan [user:BledDest,2018-08-17] Androsov, Mike [u...
registration for the boot camp!
Announcement of Educational Codeforces Round 49 (Rated for Div. 2)
194.
2024 KSA Automata Winter Contest · Arena #22 Announcement Hi, I am [user:Konijntje,2024-02-22], staff of solved.ac.
We will hold 2024 KSA Automata Winter Contest · Arena #22. The problems are prepared by Automata, an algorithmic problem-solving research group of [Korea Science Academy of KAIST](https://www.ksa.hs.kr/Eng). ([solved.ac arena page](http://solved.ac/arena/) / [acmicpc.net contest page](https://www.acmicpc.net/contest/view/1238)).
(huge thanks to [user:wizardrabbit,2024-02-22] for making this banner)
### Contest Information
- Time: [https://www.timeanddate.com/worldclock/fixedtime.html?msg=2024+KSA+Automata+Winter+Contest&iso=20240224T1900&p1=235&ah=5](https://www.timeanddate.com/worldclock/fixedtime.html?msg=2024+KSA+Automata+Winter+Contest&iso=20240224T1900&p1=235&ah=5), 300 minutes
- No. of Problems: 11, 100 points each = 1100 points total
- The questions are sorted in order of difficulty expected...
registration anytime before the contest begins. - You can participate in the
Arena without registering
195.
2nd Universal Cup. Stage 5: Northern Hello, Codeforces! I'm pleased to announce the 5th stage of the 2nd Universal Cup. It will be held from October 14th to October 15th.
The contest was prepared for you by the SPbSU LOUD Enough team ([user:tranquility,2023-10-11], [user:nikgaevoy,2023-10-11] and [user:Kaban-5,2023-10-11]), a bronze medalist of ICPC World Finals in Dhaka. We (the authors) would also like to thank [user:Gassa,2023-10-11], [user:snarknews,2023-10-11] and [user:SoshkinRoman,2023-10-11] for some useful feedback and technical assistance. And, of course, we would like to thank the organizers of Universal Cup for letting us hold our contest as a stage of Universal Cup and share it with a wider audience.
This contest was first used in the Petrozavodsk Programming Camp Winter 2023, and also appeared in the 2023 ICPC Training Camp powered by Huawei and the Hello Muscat 2023 Bootcamp. **If you participated in any of those, please refrain from participating in this stage of the Universal Cup**.
It is importa...
Register a new team: https://ucup.ac/register (the registration request will be
processed before
196.
Original Gym contest: Geometry Special 2018 Hi Codeforces,
As I mentioned before, as part of my Master's thesis, besides my [book](https://vlecomte.github.io/cp-geo.pdf) I am organizing a contest with exclusively geometry problems to showcase some types of problems or techniques that I think could be cool to see in the future in ICPC and other contests.
It will take place this Sunday 08:00 UTC in the Gym (the link will be [http://codeforces.me/gym/101793](http://codeforces.me/gym/101793), registration should open 6h before and remain open during the contest). There will be 4 problems to solve in 3 hours.
The problem should be particularly relevant for students participating to the ICPC. But the problems will be _very hard_, so I think they can be interesting to everyone with a sufficient level in geometry.
The problems will be roughly sorted by estimated difficulty, but please read all the problems, as you might find that you feel more interested by one of the "harder" problems. The statements will be given all tog...
/101793](http://codeforces.me/gym/101793), registration should open 6h before
and remain open during
197.
Invitation to CodeChef November Long Challenge 2018 sponsored by ShareChat! Hello CodeForces Community!
It’s time to gear up for CodeChef’s November Long Challenge sponsored by ShareChat! 10 days of coding fun plus opportunities to work at ShareChat! More details can be found on the contest page.
Joining me on the problem setting panel are:
- Admin: [user:mgch,2018-11-01] (Misha Chorniy)
- Problem Tester: [user:fjzzq2002,2018-11-01] (Zhong Ziqian)
- Editorialist: [user:taran_1407,2018-11-01] (Taranpreet Singh)
- Problem Setters: [user:yjq_naiive,2018-11-01] (Xiuhan Wang), [user:bciobanu,2018-11-01] (Bogdan Ciobanu), [user:altruist,2018-11-01] (Denis Anishchenko), [user:fjzzq2002,2018-11-01] (Zhong Ziqian), [user:teja349,2018-11-01] (Teja Vardhan Reddy), [user:adamant,2018-11-01] (Alexander Kulkov), [user:danya.smelskiy,2018-11-01] (Danya Smelskiy), Shivam Gupta, [user:hm2,2018-11-01] (Himanshu Mishra),
[user:well_,2018-11-01] (Sumegh Roychowdhury)
- Statement Verifier: [user:Xellos,2018-11-01] (Jakub Safin)
- Russian Translator: [user:Fedosik,2...
**Registration:** You just need to have a CodeChef handle to participate. For
all those, who are
198.
solved.ac Grand Arena #2 Announcement Hi, I am [user:TheQueenOfHatred,2023-08-10], staff of [solved.ac](https://solved.ac/en).
We will hold [solved.ac Grand Arena Round 2](https://www.acmicpc.net/contest/view/1077).
- **Time**: https://www.timeanddate.com/worldclock/fixedtime.html?iso=20230813T14&p1=235&ah=3, 180 minutes
- **Problems**: 9, in ICPC format
- **Difficulty**: **Problems A and B are the first and second easiest problems expected by the jury.** The order will be random except for problems A and B. All problems' difficulty will be between Bronze and Diamond by the solved.ac scale.
- **Penalty**: 20 minutes; The scoreboard will freeze 30 minutes before the contest ends. Compilation errors do not count toward penalties.
- **Scoreboard**: ICPC style. The contestant with more solves is ranked in a higher place. If two contestants have the same number of solves, the contestant with the small amount of the sum of penalties over all accepted problems is ranked in a higher place.
- **Time and memory**: There i...
starts. You can cancel registration anytime before the contest begins. - You
can participate in the
199.
IICPC DELTA 2026 # Applications for the IICPC DELTA Program are now open!
Hello everyone!
Registrations for the **IICPC DELTA Program 2026** are now officially open.
Welcome to **DELTA — Discovery and Early Learning in Trading & Algorithms**, a highly selective initiative by IICPC focused on identifying and nurturing exceptional early undergraduate talent interested in quantitative trading, algorithms, technology, systems and problem solving.
This edition is proudly supported by leading quantitative trading and technology firms including **Optiver**, **Hudson River Trading** and more.
## About DELTA
DELTA is designed to give high-potential students early exposure to the world of quantitative trading and advanced technology through a rigorous combination of assessments, competitions, interviews, mentorship and industry interaction.
Participants will go through challenging **Trading** and **Technology** tracks...
## Registration
200.
Invitation to BitShift 2026 Hello Everyone!!
We, the [Programming Club at IIT Madras](https://progclubiitm.com/), are excited to invite you to our upcoming event **BitShift 2026**, a competitive programming contest to be held on Codeforces! This event is proudly sponsored by [Jane Street](https://www.janestreet.com/).
#### Format
The problemset will contain around 9-15 problems, each of varying difficulty. The format is similar to usual Codeforces Gym contests, ICPC style scoring with 20 minute penalty for each wrong submission. The problems will **not** be in any particular difficulty order, so you should attempt all the questions.
The problemset might contain interactive and communication problems, so you may need to read the guides for [interactive problems](https://codeforces.me/blog/entry/45307) and [communication problems](https://codeforces.me/blog/entry/147996) before the contest. The contest will be held on the [rule...
**Update 1**: The Google form for registration has been added. Please note that
you have to fill
201.
The 2025 ICPC Asia Bangkok Regional Contest [Online Mirror] Hello Codeforces!
You are invited to join [contest:106164] on [contest_time:106164]. This is an online mirror contest for the ICPC Asia Bangkok Regional Contest 2025, which was held on November 2nd, 2025. The duration of the contest will be 5 hours, and the contest is best for teams of three people. The mirror will use the ICPC format. You can join via the [invitation here](https://codeforces.me/contestInvitation/cd385736ff43b1130ab8151ba7bb85e497997042) when the registration window is open.
The contest tasks were proposed by the task authors ([user:jonathanirvings,2025-11-02], [user:mentholzzz,2025-11-02], [user:omsincoconut,2025-11-02], [user:PineapplesOnPizza,2025-11-02], [user:PoonYaPat,2025-11-02], [user:sleepntsheep,2025-11-02] and [user:Snowfall,2025-11-02]), prepared and polished by the judge team ([user:Lucina,2025-11-02], [user:mentholzzz,2025-11-02], [user:nattee,2025-11-02], [user:PineapplesOnPizza,2025-11-02], [user:PoonYaPat,2025-11-02] and [user:Snowfall,2025-11-0...
**update.** The registration is now open.
Announcement of ICPC Asia Bangkok Regional Contest 2025
202.
CodeChef February Lunchtime — with Limak Hello Codeforces!
Did you miss Limak?
I’d like you to invite for [CodeChef February Lunchtime] (https://www.codechef.com/LTIME45) that will start at 19:35 IST / 17:05 MSK of 25-th February 2017 (check your time zone [here](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CodeChef+February+Lunchtime&iso=20170225T1935&p1=44&ah=3)) and will last 3 hours.
The contest starts 5 minutes later than usually to allow you to catch a breath after the [AtCoder Mujin Contest](http://codeforces.me/blog/entry/50457) that ends at 17:00 MSK.
I am an author of problems and editorials, while [user:niyaznigmatul,2017-02-23] is a tester. I want to thank [user:PraveenDhinwa,2017-02-23] (who is a contest admin) and [user:suraj_sharma,2017-02-23] for their technical help. Translators: [user:CherryTree,2017-02-23] \(Russian), [user:huzecong,2017-02-23] \(Mandarin) and VNOI team \(Vietnamese). Language verification: [user:arjunarul,2017-02-23].
There is no registration required, anybody with...
There is no registration required, anybody with a CodeChef handle can
participate. Top **school
203.
CerealCodes Summer 2022 Programming Contest 
Hello Codeforces!
CerealCodes is excited to announce our Summer 2022 Programming Contest!
This contest will be held on [August 13-14th](https://www.timeanddate.com/worldclock/fixedtime.html?msg=CerealCodes+Summer+2022&iso=20220813T11&p1=263) on Codeforces (with 4 different start times).
The competition has three divisions: Novice (USACO Bronze-Silver or Div 3), Intermediate (USACO Silver-Gold or Div 2), and Advanced (USACO Gold-Platinum or Div 1).
You can form teams of up to 3 members, and compete to solve ~6 high quality (cereal themed!) problems within 3 hours.
Over $500 in cash (possibly more) will be given out (in the form of Amazon gift cards), as well as other prizes like merchandise and raffle awards!!! Note: only pre-college teams are eligible for cash awards.
Join our [Discord server](https://discord.gg/qve3dBA8Ek) for more info and access to faster communication about our competiti...
We will be updating registration shortly to allow you to securely enter the
Codeforces group with
204.
Eolymp Cup #4 
Eolymp Cup #4
=============
Get ready for the [final round of the Eolymp Cup](https://basecamp.eolymp.com/en/contests/ajbi7s2jld37fch2ulvjkvgi9g) happening on **Sunday, March 2**! Compete for a chance to **win free HSU scholarships, Eolymp subscriptions**, and our **exclusive T-Shirts**. Don’t miss out on the action—we’re excited to see you there!
### About
**Eolymp Cup** is a programming competition for students. The competition consists of 4 rounds, held throughout the year. Each round features 6 problems, each designed to challenge participants' knowledge of algorithms, data structures and programming.
The competition is open to everyone, but prizes will only be awarded to participants who are born after January 1, 2002. All other participants will compete unofficially.
### Format and Duration
In each round, you are given 3 hours to solve 6 problems. Each problem is split into sub-t...
scholarship at Harbor.Space University" during registration., ### Registration You can register on the [contest
page](https://basecamp.eolymp.com/en/contests
205.
Bay Area Programming Contest 2026 The Bay Area Programming Contest ([link to last year's announcement](https://codeforces.me/blog/entry/139237)) returns on Sunday, March 1st, 2026. **This year, we will be hosting both a novice and advanced division.**
The estimated Codeforces ratings of the Novice problems range from 800 to 1900 (USACO Bronze to Gold). For Advanced, the estimated ratings range from 800 to 3000 (USACO Bronze to Platinum).
**If you are rated 1600+ or USACO Gold and above, you may only sign up for the Advanced Division.**
Detailed information, which will be updated as the contest day draws nearer, is at [bapc.gunncpc.com](bapc.gunncpc.com). You can register for the contest [at this link](https://docs.google.com/forms/d/e/1FAIpQLSdX04VD4NZjPy1-OmDPcXJQoe6nwF9XldqUMEqoHg3R2w_dUw/viewform).
All problems were created and prepared by [user:GusterGoose27,2026-02-12], [user:hihitherethere,2026-02-12], [user:Westin_sheep,2026-02-12], [user:Agent-Pea,2026-02-12], [user:Yttrialite,2026-02-12], and [use...
Note: If you already filled out the registration form, you will automatically
be put into the
206.
GoForGold Winter Camp 2025 
#### Greeting Indian ICPC contestants !!
Announcing GO FOR GOLD Camp
------------------
After three (Winter camp 2024, IOI Camp 2025 and Elite Camp 2025) successful camp, We are very happy to announce that GFG(GoForGold) is back this Winter, on Dec 7-14, 2025!
We are hosting a 7 days offsite invite-only bootcamp to train this year aspirants for Asia West and World Finals. The contest will happen in 2 divisions
- division 1 (ex ICPC Finalist teams and top teams from prelims, ideal rating 2000+)
- division 2 (top 30-40 teams from the prelims and ex-Asia west Finalist teams, ideal rating 1600+)
Previous Camp Blogs : [2024 Winter Camp Announcement](https://codeforces.me/blog/entry/135929) , [2024 Winter camp wrap](https://codeforces.me/blog/entry/137331), [2025 OCPC X Elite Camp Announcement](https://codeforces.me/blog/entry/143921), [2025 OCPC X Elite Camp Wrap](https://codeforces.me/blog/en...
Registration Deadline: **29th Nov 2025**, Registration Link: https://goforgold.in/wintercamp
207.
ICPC Amritapuri Practice Session #7 [Team Contest] Announcement Hello Codeforces,
**ICPC Amritapuri** Regional will be hosting next team practice round on [CodeDrills](https://codedrills.io/contests/amrita-icpc-practice-session-7) on [Tuesday, 25th May 2021](https://www.timeanddate.com/worldclock/fixedtime.html?msg=ICPC+Amritapuri+Practice+Session+%237&iso=20210525T1830&p1=438&ah=2&am=30). There will be 5 problems to be solved in 2.5 hours.
**Contest Details**
* Contest Link — [Amritapuri Practice Session #7](https://codedrills.io/contests/amrita-icpc-practice-session-7)
* Date & Time — [25 May 2021, Tuesday, 18:30 IST](https://www.timeanddate.com/worldclock/fixedtime.html?msg=ICPC+Amritapuri+Practice+Session+%237&iso=20210525T1830&p1=438&ah=2&am=30)
* Duration — 2.5 Hours
* Will follow standard ICPC scoring system (20 minutes penalty and 1 point per problem)
* It is a team contest and it would be unrated.
**Registration**
* You will need to create a tea...
**Registration**
208.
Educational Codeforces Round 55 [Rated for Div. 2] On [contest_time:1082] [contest:1082] 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 extented ACM 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 **7 problems** and **2 hours** to solve them.
The problems were invented and prepared by Mike [user:MikeMirzayanov,2018-11-27] Mirzayanov, Roman [user:Ajosteen,2018-11-27] Glazov, Adilbek [user:adedalic,2018-11-27] Dalabaev, Vladimir [user:V...
/icpc/icpc-hello-muscat-bootcamp-2019/?utm_source=codeforces) registration is
open! The camp will
209.
Iranian Combinatorics Olympiad 2026 Hello everyone,
The Iranian Combinatorics Olympiad is back! WITH LOTS OF CHANGES!!!
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 i...
Registration instruction:
210.
TeamsCode Summer 2026 Virtual Programming Contest Hello Codeforces! [TeamsCode](https://www.teamscode.org) is excited to announce the [TeamsCode Summer 2026 Virtual Programming Contest](https://www.teamscode.org/contests/summer-2026)! It will take place on **Sunday, August 23rd from 11:30 AM to 5:30 PM Pacific Time / 2:30 PM to 8:30 PM Eastern Time**.
**Teams of up to 4 members will have 3 hours to solve 12 problems.** There are two divisions: Novice and Advanced, so no matter what skill level you are, there is a place for you.
The schedule is shown below:
<spoiler title="Schedule">
</spoiler>
Our prize pool for winners of the Novice and Advanced divisions is over $1,000! Only pre-college participants are eligible for placement prizes; however, anyone may participate in the contest. The prizes include Amazon gift cards, Discord Nitro, and more! Placement prizes are given to each team member (e.g., everyone on the 1st place Advanced team w...
Please visit https://www.teamscode.org/contests/summer-2026 for registration
and more information
Announcement of TeamsCode Summer 2026 Contest
211.
JOI 2023/2024 Final Round Online Contest Hello, everyone!
[The 23nd Japanese Olympiad in Informatics (JOI 2023/2024) Final Round](https://contests.ioi-jp.org/joi-ho-2024/index-en.html) will be held from [Sunday, February 04th, 10:00 UTC](https://www.timeanddate.com/worldclock/fixedtime.html?msg=JOI+2023/2024+Final+Round&iso=20240204T10&p1=1440) to [Monday, February 05th, 10:00 UTC](https://www.timeanddate.com/worldclock/fixedtime.html?msg=JOI+2023/2024+Final+Round&iso=20240205T10&p1=1440). The contest information is as follows:
* Contest duration: **4 hours** (You can choose start time freely in 24-hour window)
* Number of tasks: **5 tasks**
* Max score for each task: **100 points**
* Style: **IOI-Style** (There may be some partial scores)
* Problem Statement: **Japanese & English**
Note that since the contest ends at [Monday, February 05th, 10:00 UTC](https://www.timeanddate.com/worldclock/fixedtime.html?msg=JOI+2023/2024+Final+Round&iso=20240205T10&p1=1440), if you start the contest after [Monday, February 05th...
The registration page and live scoreboard will be announced **30 minutes**
before the contest
212.
Vector tracing **Note.** This English translation was produced with the help of ChatGPT.
This year, BSUIR Open XIV took place, and I was very happy to travel to Minsk and attend the contest itself. But what I liked even more was the problem that I proposed there. Overall, I had not seen this idea before, though it feels simple enough that it may well have appeared in some earlier contest. So if you know where this idea had shown up before, please let me know.
**Problem.** (*BSUIR OPEN XIV*) We are given a $100 \times 100$ grid. Some pairs of adjacent cells are separated by walls, and there are also walls along the boundary of the grid. A ray starts from the center of cell $(r,c)$ in direction $(x,y)$. We need to determine in which cell it will be after traveling a distance of $\sqrt{x^2+y^2}$, assuming the ray reflects off walls.
Solving the problem
------------------
Let us look at the vector $(x,y)$ and examine the order in which it crosses the vertical and horizontal grid lines. At th...
```cpp template M
213.
Japanese Olympiad in Informatics (JOI) Spring Camp 2021 Hello Everyone!
Japanese Olympiad in Informatics Spring Camp 2021 will be held from Mar. 20 to Mar. 23.
There will be four online mirror contests during the camp.
- day1 : [Mar. 20, 02:00 — Mar. 21, 00:00 GMT](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Japanese+Olympiad+in+Informatics+%28JOI%29+Spring+Camp+2021+Day1&iso=20210320T02&p1=1440&ah=22)
- day2 : [Mar. 21, 02:00 — Mar. 22, 00:00 GMT](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Japanese+Olympiad+in+Informatics+%28JOI%29+Spring+Camp+2021+Day2&iso=20210321T02&p1=1440&ah=22)
- day3 : [Mar. 22, 02:00 — Mar. 23, 00:00 GMT](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Japanese+Olympiad+in+Informatics+%28JOI%29+Spring+Camp+2021+Day3&iso=20210322T02&p1=1440&ah=22)
- day4 : [Mar. 23, 02:00 — Mar. 24, 00:00 GMT](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Japanese+Olympiad+in+Informatics+%28JOI%29+Spring+Camp+2021+Day4&iso=20210323T02&p1=1440&ah=...
The contest site and registration form will be announced about 30 minutes
before the contest.
214.
CROC 2016: Programming Championship Hello, Codeforces!
<img src="http://assets.codeforces.com/images/croc-eng-logo-200.png" style="float: left;margin: 0 1.5em;max-width: 100.0%;max-height: 100.0%;">
In the spring 2016 the company CROC together with Codeforces will hold the third Russian Open programming championship «CROC – 2016». The goal of this project, as before, — encourage of the most talented and innovative young specialists and stimulate interest to the information technology.
As usual CROC company pays great attention to social projects, associated with the development of the IT-industry, to promotion of IT-professions and to the increasing interest in modern technology. CROC has rich experience of cooperation with universities, the organization of courses, seminars and competitions for pupils, students and experienced professionals.
The registration to the championship will be open from March, 1st to March, 16.
Anyone, regardless of nationality, place of residence and level of education, c...
## Registration
215.
Invitation to LOCKOUT prelims 2024 (ANCC, IIT Delhi) Hello Codeforces!
The Algorithms and Coding Club, IIT Delhi (ANCC) in collaboration with Tryst, IIT Delhi, will host LOCKOUT and would like to invite you all for the same.
**Lockout** is a bracket tournament where contenders will solve CP problems to earn a higher score and secure their position in the next round. Participants will receive a set of problems to solve within a fixed time frame, with each problem carrying a set number of points. The first participant to solve a problem earns the points. Before the main event, a preliminary round will be held, and the **top 16** participants will advance to the tournament.
**Lockout Prelims Details:**(Online)
The Lockout Prelims will be hosted on the Codeforces platform. The contest will serve as an online preliminary round for an on-site final. It will be an ICPC style 2 hour long contest. The top 16 participants with the highest scores will proceed to the onsite tournament.
- Date & Time : [3rd March 2024, 8-10 PM IST]...
**UPD** : Contest Registration Link : https://codeforces.me/contestInvitation
216.
Eolymp Cup #3 
Eolymp Cup #3
=============
Get ready for the [third round of the Eolymp Cup](https://basecamp.eolymp.com/en/contests/s9jjggk0op4b55163d4t9l39nc) happening on **Sunday, December 15**! Compete for a chance to **win free HSU scholarships, Eolymp subscriptions**, and our exclusive **Evil Chmyaaax T-Shirt**. Don’t miss out on the action—we’re excited to see you there!
### About
**Eolymp Cup** is a programming competition for students. The competition consists of 4 rounds, held throughout the year. Each round features 6 problems, each designed to challenge participants' knowledge of algorithms, data structures and programming.
The competition is open to everyone, but prizes will only be awarded to participants who are born after January 1, 2002. All other participants will compete unofficially.
### Format and Duration
In each round, you are given 3.5 hours to solve 6 problems. Each problem i...
scholarship at Harbor.Space University" during registration., ### Registration You can register on the [contest
page](https://basecamp.eolymp.com/en/contests
217.
MIKE, ban BOTS, please! (Bad English, so I used AI.)
I know there are other posts about this. I listed some bots here. I'm also wondering why some of these accounts were not banned earlier.
---
**Bots with a UUID in their code.**
[user:wtehjnyu426,2025-11-17] [user:nxaadm9648,2025-11-17] [user:zwatti772,2025-11-17] [user:aqkwgw19463,2025-11-17] [user:dftvmz000,2025-11-17] [user:kxwzyd795,2025-11-17] [user:rbaglkv2489,2025-11-17] [user:ndxxau86464,2025-11-17] [user:ohfwwv873,2025-11-17] [user:tujjmglhyu41495,2025-11-17] [user:hkebxfxb9714,2025-11-17] [user:cexfkoe511,2025-11-17] [user:zsphrmp855,2025-11-17] [user:xeyjmne82169,2025-11-17] [user:jpzqgrs59098,2025-11-17] [user:jttrfprg748,2025-11-17]
---
**Bots appear to be from the same LLM.**
They have random names(the name length is always 10), an empty first line in their code, and they attempt problems sequentially by contest ID (e.g., one attempted IDs 835–909). **Most importantly, these bots submit many problems at once.**
**Since t...
**Since these accounts are registered and abandoned within hours, I think
additionalregistration
218.
"Adolescent Grigore Moisil" (AGM) International Programming Contest 2025 Dear Codeforces,
I am honoured to share that the XI-th edition of the AGM International Programming Contest has officially begun!
AGM is addressed to High School students who compete in teams of up to 3 members, ICPC-style. The contest has 2 rounds:
1. **The Qualification Round** held online, on Saturday, the **1st of March 2025** between **14:00** and **19:00 GMT+2** ([timeanddate](https://www.timeanddate.com/worldclock/fixedtime.html?msg=AGM+Qualification+Round+2025&iso=20250301T14&p1=49&ah=5))
2. **The Final Round** held onsite. The location, date and time will be announced soon.
Registrations are opened until **Thursday, the 27th of February 2025**: [https://forms.gle/zQ5dZKyTbYX1Xbpa7](https://forms.gle/zQ5dZKyTbYX1Xbpa7)
<img src="/predownloaded/0d/2b/0d2b280e347f13a20f9a3d7439a11423de1c7316.jpg" style="float:right;width:50%;height:50%;margin:5px">
The problem sets are entirely developed by current and former university students from the United Kingdom and Roma...
219.
Mathmania — Codefest'18 Hi, Codeforces Community!
[Codefest'18](http://codefest.tech/) — a diverse roster of high-quality programming competitions by Department of Computer Science and Engineering, IIT Varanasi is excited to present **Mathmania**.
Mathmania is a mathematical puzzle contest where a sound knowledge of mathematics together with computational thinking will be essential to solve problems. The motivation behind Mathmania is to provide a platform for the inquiring mind to dwelve into unfamiliar areas and learn new concepts in an exciting way.
The contest will take place at **Topcoder**. This contest will be an individual event with a duration of 3 hours, from [Sep/1/2018 12:30 UTC](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Mathmania+-+Codefest%2718&iso=20180901T18&p1=1045&ah=3). The contest will be **unrated** for both Div1 and Div2 participants but will be a long match which will consist of interesting mathematical challenges covering almost all domains of Mathematics, rang...
#### **Registration:**
220.
ICPC : GO FOR GOLD UPDATE BLOG If you haven't read the camp announcement yet, check it out here: [blog](https://codeforces.me/blog/entry/135929)
### Updates
Since the ICPC prelims will be held again, and due to the short notice, it might be difficult for teams to arrange travel. Therefore, we will be selecting teams based on one of the following criteria:
**1. Your past performance in ICPC Regionals/AWC/WF**
**2. Average rating of your team (~1800+ for Div 2 and ~2100+ for Div 1, with some advantage for 2nd/3rd year students and IOI candidates)**
**3. Having solved at least 4 problems in the recent prelims round.**
**Selection Notification:**
Selected teams will receive an email confirmation from today onwards (until November 20th).
**Div 1 Teams:**
- Please acknowledge your selection and send your arrival/departure times. This information will help us book your accommodation and arrange travel from New Delhi Airport/Railway Station to the camp location.
- Provide the usernames of yo...
**Registration:**
221.
Algoge Round Hello Codeforces community!
I would like to announce [Algoge](http://algoge.com/) Round 4. The contest will be held on [Sunday 10th May at 15:00 UTC](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Algoge+Round&iso=20200510T15&p1=%3A&ah=3).
Algoge is site created by students of the Faculty of Computer Science during quarantine days in Serbia, based on the DMOJ platform. As there are no onsite contests these days, we decided to organize $5$ online rounds mainly for participants from Balkan. In the first three rounds, the tasks were only available on Serbian. Easier tasks were prepared by us and harder ones were taken from Moscow Workshop competitions. We had between 50 and 150 participants per round.
This is the first round fully created by us. For that purpose we decide to translate the tasks into English (Serbian version will be available too) and invite all of you to compete. Round will have $5$ or $6$ tasks and lasts $3$ hours. Tasks will be slightly harder than u...
After registration on the site you need this
[link](http://algoge.com/contests/) for the round
222.
ACTS 2026.2 in Bremen The best summer school is back! This time in a new country and with a brand new track!
We’re happy to invite you to the upcoming [ACTS in Germany 2026.2](https://lp.jetbrains.com/academy/acts/2026.2/), the best summer camp full of learning, problem-solving, and fun.
- Date & location: July 10-20, 2026 at Constructor University, Bremen, Germany
- Participants: High school students aged 16-19
- Organizers: Constructor University Bremen, Neapolis University Pafos, with support from the JetBrains Foundation.
- Tracks: Competitive Programming & Software Engineering
- Costs: Accommodation, meals, and the academic program are fully covered by the organizers. Participants' only costs are travel and a camp fee of 100 EUR.
- Entrance Contest: **April 26, 8:00-11:00 UTC**.
Competitive Programming track. For students who love algorithms and contests
- Teachers: Top coaches, including me ([user:pashka,2026-...
[Register here by April 25](https://lp.jetbrains.com/academy/acts/2026.2/#
registration)
223.
JOI 2024/2025 Final Round Online Contest Hello, everyone!
[The 24th Japanese Olympiad in Informatics (JOI 2024/2025) Final Round](https://contests.ioi-jp.org/joi-ho-2025/index-en.html) will be held from [Sunday, February 02th, 10:00 UTC](https://www.timeanddate.com/worldclock/fixedtime.html?msg=JOI+2024/2025+Final+Round&iso=20250202T10&p1=1440) to [Monday, February 03th, 10:00 UTC](https://www.timeanddate.com/worldclock/fixedtime.html?msg=JOI+2024/2025+Final+Round&iso=20250203T10&p1=1440). The contest information is as follows:
* Contest duration: **4 hours** (You can choose start time freely in 24-hour window)
* Number of tasks: **5 tasks**
* Max score for each task: **100 points**
* Style: **IOI-Style** (There may be some partial scores)
* Problem Statement: **Japanese & English**
Note that since the contest ends at [Monday, February 03th, 10:00 UTC](https://www.timeanddate.com/worldclock/fixedtime.html?msg=JOI+2024/2025+Final+Round&iso=20250203T10&p1=1440), if you start the contest after [Monday, February 03th...
The registration page and live scoreboard will be announced **30 minutes**
before the contest
224.
Montgomery Blair Informatics Tournament (mBIT) Spring 2022 Round **Reminder that the contest starts in 10 minutes!**
<div style="text-align: center;">
<img src="https://i.ibb.co/YyrtJ2w/Screenshot-2022-04-23-145543.png" width="50%" class="center">
</div>
The [Montgomery Blair HS Computer Team](https://compteam.mbhs.edu/) is excited to present the fifth edition of **Montgomery
Blair Informatics Tournament (mBIT)**, which will be held online from [1:00 PM — 4:00 PM EDT](https://www.timeanddate.com/worldclock/fixedtime.html?msg=mBIT+Spring+2022&iso=20220522T13&p1=263&ah=3) on **Sunday, May 22 (05/22/22)**. Note that the contest is 3 hours long this year.
If you are interested in competing, please register at [https://mbit-live.mbhs.edu/](https://mbit-live.mbhs.edu/). All problems were written by the Montgomery Blair Computer Team, including [user:csytrn,2022-04-23], [user:czhang2718,2022-04-23], [user:-DanTheMan-,2022-04-23], [user:gabrielwu,2022-04-23], [user:jh0, 2022-05-08], [user:nachoz,2022-04-23], and [user:susp,2022-04-23]. S...
- [Website/Registration](https://mbit-live.mbhs.edu/)
225.
About Mashup Registration Recently, my friends and I wrote a mashup contest. We gave the link to others to register, however I encountered two problems.
Firstly, registration is only open within six hours of contest time. So, when a user gets invited to a mashup, they are not able to register until six hours before contest starts.
Is there any way to set a custom registration time (e.g. 3 days before the contest)? If there isn't, I think this would be a cool feature to add to mashup contests.
Secondly, after a user is successfully registered, they would receive the pop-up "You have been successfully registered", and they would get redirected to [this](https://codeforces.me/gyms) page. This means that they have to paste the contest link / invitation link **again** in order to view the contest page (in the format of `https://codeforces.me/contests/[6-digit number]`). This can be confusing and inconvenient to mashup participants...
About Mashup Registration, . However, the registration time problem hasn't been solved, so I would like to
hear from your thoughts., Is there any way to set a custom registration time (e.g. 3 days before the
contest)? If there isn't
226.
Welcome to LibreOJ "Hello WuXu" Round! 
### [Contest Link](https://loj.ac/contest/22)
> The night falls usually, while the street lights are shining;
>
> The new year came quietly, with the bells of temples ringing.
>
> The splendours and hardships of the bygones has faded away, rendering centuries of reality as transient as fleeting clouds;
>
> And the uncertainties and probabilities of the future is yet to come, making the shared offing between you and me.
The Lunar New Year is here! Out with the old, in with the new, [LibreOJ](https://loj.ac/) is holding a grand contest for the Year of Wuxu.
The round will be similar to a normal Codeforces Div.1 round in difficulty. We have picked some interesting ideas for this round, and partial-score subtasks will be available. We believe that all participants can get quite a bit from them.
The round will be held on IOI rules with no submission limit, the scores of different problems will be different.
...
the link in it to complete your registration.
227.
Invitation to join the NOI.PH 2020 Elimination Round Mirror at the Codeforces Gym [Link to the mirror!](https://codeforces.me/gym/102503) (Please register at [the gym](https://codeforces.me/gyms))
Hello Codeforces!
I'd like to invite you to the [mirror](https://codeforces.me/gym/102503) of the 2020 eliminations round of the [National Olympiad in Informatics – Philippines](https://noi.ph/). The mirror will be held in the Codeforces gym. The NOI.PH is the Philippines' qualifier for the IOI.
Contest format:
- There are 17 problems over 9 days.
- The problems will have subtasks. The maximum score for each problem will be 100 points.
- The submission that achieves the maximum score is counted towards the final ranking.
- The problems range from easy to challenging. Everyone from the newbie to the grandmaster will find an interesting problem in the contest.
Editorials will be released after the mirror contest ends.
Acknowledgments: The problem setters were [user:kevinsogo,2020-01-30], [user:cjquines,2020-01-30], [user:Shisuko,2020-01-30], [user:and...
**Edit:** Registration is now open! I've added the
[mirror](https://codeforces.me/gym/102503) link
228.
2018-2019 ACM-ICPC, Asia Xuzhou Regional Contest (Online Mirror on Gym) Hello!
This weekend we would like to share an online-mirror of [contest:102012] with you. Please notice its start time is [Saturday, December 1, 2018 at 18:00 (UTC+8)](https://www.timeanddate.com/worldclock/fixedtime.html?day=1&month=12&year=2018&hour=18&min=0&sec=0&p1=33) and we will be there for answering your questions. You are able to register 6 hours before the contest starts. However, before the registration starts, you may not view this contest on Gym. After the online-mirror contest, you can virtually participate at any time you want.
The 2018 ACM-ICPC Asia Xuzhou Regional Contest has been finished at China University of Mining and Technology, on October 28. Although 288 teams participated in the onsite contest, only 195 of them (including invited teams) finally solved at least one of **13 problems** in **5 hours**. Is the contest too hard? Or is the difficulty only applied to Chinese participants? We cannot get a conclusion clearly... Anyway, we hope these problems will ...
**UPD1:** Registration starts. You may [view this
page](https://codeforces.me/gymRegistration
229.
Invitation to Insomnia Qualifier 2024 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 of **up to 3 members**.
Contest Details:
- Qualifiers:
- Start Time: [Saturday, March 16, 22:30 IST](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Insomnia+Qualifier+2024&iso=20240316T223000&p1=2408)
- Duration: 2.5 hours
- Finals:
- Start Time: [Monday, March 18, 12:00 IST](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Insomnia+Finals+2024&iso=20240318T120000&p1=2408)
- Duration: 3 hours
The **Top** **25 global teams** and the **Top 25 teams** from MNNIT (based on the result of Qualifiers) will qualify for the Finals. The prize distribution for global teams is mentioned below:
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