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

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DeepInfra Round 1 (Codeforces Round 1126, Div. 1 + Div. 2) Hello, Codeforces! We are excited to invite you to [contest:2271], which will take place on [contest_time:2271]! **Note the unusual start time of the round**. You will have **3 hours** to solve **8 problems**, one of which is divided into subtasks. The problems were prepared by [user:employed,2026-10-03] and reviewed carefully by [user:nifeshe,2026-10-03]. We have put a lot of care into creating and testing this problemset, and we hope you will enjoy solving the problems as much as we enjoyed preparing them! A huge thank you to everyone who helped bring this round to life: - [user:nifeshe,2026-10-03] for coordinating the round and being funny, cool, and smart! - [user:dominater069,2026-10-03] for the early review of the problems. - [user:Evenimage,2026-10-03], [user:akslolcoding,2026-10-03], [user:apracadabra,2026-10-03], [user:Euclid73,2026-10-03], [user:linearspace,2026-10-03], [user:Mohammad_Hacker,2026-10-03], [user:naneosmic,2026-10-03], [user:nik_exists,2026-10-0...

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ICPC World Finals 2018 <img src="/predownloaded/de/f3/def309578bab3ca770ea7262a4135f8f1ea50545.jpg" style="margin: 0 0 0 1em; float: right;"> ACM-ICPC World Finals 2018 will begin on <a href="https://www.timeanddate.com/worldclock/fixedtime.html?msg=ACM+ICPC+2018+World+Finals&iso=20180419T10&p1=33&ah=5">April 19, 2018 at 2:00 (UTC)</a>. This event is the main event of the year in the world of sports programming! In the past 20 years alone, ICPC participation has increased by more than 2000%. Last year, ICPC Regional participation included 49,935 of the finest students and faculty in computing disciplines from 3,098 universities in 111 countries on six continents. A record 53,446 students and 5,411 coaches competed in ICPC and ICPC-assisted competitions last year, setting new records in participation. Codeforces wishes the teams to show a vivid and interesting contest. We wish to find beautiful solutions, write without bugs and enjoy many accepted problems! Links: * <a style="font-weight: bol...

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ICPC Finals 2019 <img src="/predownloaded/02/25/02253adce36abb83bcaedca3cd1498b9d459d90d.png" style="margin: 0 0 0 1em; float: right;"> ICPC World Finals 2019 will begin on <a href="https://www.timeanddate.com/worldclock/fixedtime.html?msg=ICPC+World+Finals+2019&iso=20190404T12&p1=320&ah=5">April 4, 2019 at 11:00 (UTC)</a>. This event is the main event of the year in the world of sports programming! In the past 20 years alone, ICPC participation has increased by more than 2000%. The contest evolved into its present form as a multi-tier competition in 1977, with the first finals held in conjunction with the ACM Computer Science Conference. Last year, ICPC Regional participation included 52,709 of the finest students and faculty in computing disciplines from 3,233 universities in 110 countries. We remind you that in the current world champion is the team of Moscow State University. Codeforces wishes the teams to show a vivid and interesting contest. We wish to find beautiful solutions, write ...

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

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Educational Codeforces Round 50 [Rated for Div. 2] On [contest_time:1036] Educational Codeforces Round 50 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,2018-09-06] Petrov, Roman [user:Ajosteen,2018-09-06] Glazov, Ivan [user:BledDest,2018-09-06] Androsov, Maxim [user...

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

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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...

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ACM-ICPC World Finals 2017 <center> <img src="/predownloaded/4d/47/4d475972ef3e14948e881152064cc208a4f83540.png"/> </center> ACM-ICPC World Finals 2017 will begin on <a href="https://www.timeanddate.com/worldclock/fixedtime.html?msg=ACM+ICPC+2017+World+Finals&iso=20170524T09&p1=1920&ah=5">May 24, 2017 at 15:00 (UTC)</a>. This event is the main event of the year in the world of sports programming! This year ICPC Regional participation included 46,381 of the finest students and faculty in computing disciplines from 2,948 universities in 103 countries on six continents. A record 50,145 students and 5,073 coaches competed in ICPC and ICPC-assisted competitions this year, setting new records in participation. Codeforces wishes the teams to show a vivid and interesting contest contest. We wish to find beautiful solutions, write without bugs and enjoy many accepted problems! Links: * <a style="font-weight: bold;" href="http://static.kattis.com/icpc/wf2017/">Current results</a> * <a href="https:/...

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How to Interpret Contest Ratings **UPDATE: the [new rating system paper](https://arxiv.org/abs/2101.00400) will appear in the Web Conference 2021!** If you're new to competitive programming, you may be wondering: what are ratings and colors? What do they mean? As a contestant and now coach of the UBC team, I've taken enough interest in the subject to have developed my own rating system, Elo-MMR, which I might describe in a future blog post. For now, I want to talk about ratings more generally: what does it mean to achieve a certain rating or title? How concerned should you be with your rating and title? Might it be harmful to be concerned with them at all? A Brief History of Contest Ratings -------------------------------------- Contest rating systems can trace their heritage back to the [Elo system](https://en.wikipedia.org/wiki/Elo_rating_system). Elo was devised for 2-player games, with rating updates based on whether a player wins, loses or draws. Starting in 1960, it was adopted by the chess community ...

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Codeforces Round #433 (based on Olympiad of Metropolises) <center><img src="/predownloaded/1e/86/1e865ca9b49968024cce40b66479f540d7757aed.png" style="width:30%" /></center> Hi everybody! These days Moscow is conducting the [2nd International Olympiad of Metropolises](http://megapolis.educom.ru/en) that is an international competition for high school students from biggest cities and capitals all around the world. One of the disciplines of the competition is informatics. Rounds of the competition were prepared by the jury members invited from St. Petersburg, Minsk, Almaty and Moscow olympiad scientific committee which you may know by Moscow team Olympiad, Open Olympiad in Informatics and Moscow Olympiad for young students (rounds [327](http://codeforces.me/blog/entry/21185), [342](http://codeforces.me/blog/entry/23309), [345](http://codeforces.me/blog/entry/43615), [376](http://codeforces.me/blog/entry/47769), [401](http://codeforces.me/blog/entry/50613)). We are very grateful to [user:MikeMirzayanov,2017-09-05] for Polygon syste...

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Editorial of Codeforces Round 963 (Div. 2) [problem:1993A] <spoiler summary="Hint"> What is the pattern of Tim's answer sheet that can give him maximum score? </spoiler> <spoiler summary="Solution"> Let's say there are $n$ problems take $A$ as the answer, therefore he can only get $n$ points with the answer $A$. The same is correct for $B$, $C$ and $D$. Therefore, the maximum score can be achieved is $min(n, A) + min(n, B) + min(n, C) + min(n, D)$. Time complexity: $O(4n)$ </spoiler> <spoiler summary="Code (python)"> ~~~~~ t = int(input()) for _ in range(t): n = int(input()) s = input() print(sum(min(n, s.count(c)) for c in "ABCD")) ~~~~~ </spoiler> [problem:1993B] <spoiler summary="Hint 1"> Find a way to make all the elements even. Then odd. </spoiler> <spoiler summary="Hint 2"> In the worst case, the number of operations required is the number of even elements + 1. Why? </spoiler> <spoiler summary="Solution"> First, if all elements already have the same parity, we don'...

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Educational Codeforces Round 130 [Rated for Div. 2] Hello Codeforces! On [contest_time:1697] [contest:1697] 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,2022-06-11] Dalabaev, Vladimir [user:vovuh,2022-06-11] Petrov, Ivan [user:BledDest,2022-06-11] Androsov, Mak...

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The Journey to Candidate Master: Plateaus, Faith, and Consistency I started **Competitive programming** in **August 2024**, at the beginning of my second year of college. My first few Div.2 contests were humbling — I could solve 1 problem, sometimes 2. In Div.3, solving 3 problems felt like a win. But what kept me going was not the rating, but the nature of the problems themselves. At the **800–1000 level**, it’s mostly about thinking — no fancy algorithms, no heavy data structures — just logic and clarity. **That fascinated me**, and I decided to stay. **---------------------------------------------------------------------------------------------------------------------------------------------------** The Phase Nobody Talks About ---------------------------- In the first four months, I climbed quickly and reached **1459** on **12 January 2025.** Then the graph stopped moving. For the next **110 Days**, I was **stuck below 1450**. I practiced. I gave contests. I did everything I had been doing before. But nothing showed. On...

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I stuggled with A and B in the last div 2, and how YOU can learn from it (CF 968 Div. 2) I noticed that sometimes I do some horrible things while solving easy problems. If you struggled with the first $2$ problems from the previous round, you might also have made some huge mistakes that should not happen. **The point of this blog:** I will show you my terrible ways of approaching each of these problems and you will be able to see all of the stupid things that I did. Then I will show you the proper way to approach the tasks, and then you can think which approach is more similar to yours, and maybe it will help you to improve. ### Problem A. Turtle and Good Strings #### My approach during contest (terrible way) - I open the statement, incorrectly rephrase it: **you are given a string, you should divide it into several substrings, so in each substring the first and the last letters are different** - I think of a dp solution, then I sloppily prove that I should take no more than $2$ substrings. I submit my [non-dp solution](https://codeforces.me/contest/2003/submi...

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Codeforces #47 problem solutions <p><em><strong>Problem A</strong></em>: Answer is floor(N*M*0.5). Since there is N*M cells on the board and each domino covers exactly two of them we cannot place more for sure. Now let's show how to place exactly this number of dominoes. If N is even, then place M rows of N/2 dominoes and cover the whole board. Else N is odd, so cover N-1 row of the board as shown above and put floor(M/2) dominoes to the last row. In the worst case (N and M are odd) one cell remains uncovered.<br>[cut]<br><em><strong>Problem B</strong></em>: Of course you were expected to code solution which is not quadratic in time complexity. Iterate over the string and count how many times each char is used. Let K_i be the number of occurrences of char with ASCII-code i in the string S. Then answer is sum(K_i²). While coding the solution the following common mistakes were made:<br><br>1. Code quadratic solution (double loop over the string)<br>2. Forget to use int64. Whether in answer...

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Harbour.Space University and Remy Robotics: Master's in Robotics programme scholarship <img src="https://assets.codeforces.com/images/artboard-2_1.png" style="float:right; margin: 0 1em 1em 1em; width:450px;"/> My friends from Harbour.Space and Remy Robotics asked to publish the news. I am excited and glad to do it, because for our community this is a true exclusive offer. In short, they offer to study robotics in Barcelona, paying for your studies and even with a scholarship! It's so cool! Here is a direct speech from Harbour.Space. = Hi Codeforces! We are excited to announce our new Master’s in Robotics programme scholarship, which will be paired alongside an internship with our partner Remy Robotics! The programme will begin on January 7th, 2019, at our university in Barcelona, Spain. Harbour.Space’s Robotics programme is the bridge between a personal interest in the world of Robotics, Artificial Intelligence, and a top-level professional future in one of the most exciting and fastest growing fields of technology. Students who enter the programme w...

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Math and informatics competition, with prizes! Hello Codeforces! I am pleased to invite you to CAMA (Amateur Mathematical and Algorithmic Competition, the acronym comes from Spanish). CAMA is a mixed competition of mathematics and informatics founded by Spanish international medallists in those disciplines. Although the competition is mainly focused on Spanish students, it is open for everyone! The competition will be split in two divisions, basic and advanced. The basic division is intended for those who have never participated in a mathematics/informatics competition, while the advanced division is focused on contestants who are already veterans. Before signing up for a division, please note that you can only be eligible for prizes in the combined category if you have signed up for the advanced division in both mathematics and informatics, and winners of the basic divisions will receive fewer prizes. The mathematics competition will take place on October 21st at 19:00 CEST, while the informatics competition will be on Oc...

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Busy but Master #2 Alternative name: "Road to Master when you don't have time". Episode 1: [link](https://codeforces.me/blog/entry/133458) Episode 2: September 2024 > See you in a month when I'm purple. Just unlucky?:) Two months of grinding Codeforces and I'm still not purple. It might seem like a failure, but if I look closely, I can see significant improvement compared to my performance in August. ### Practice results I feel like in the second half of the month, I've lost my ability to think properly, feel so dumb. Maybe it's just an illusion because I’m solving 2200-2400 rated problems instead of 1800, but still, it feels strange. I motivate myself by reminding that this must be a transitional stage, after which I'll see a big boost. University has started, and while it hasn’t taken up much of my time yet, I already spend ~full,2024-10-04 saturday for it. Plus, I spend a few hours a week chilling on social media, so compared to August, I probably have only about 70% of that ti...

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What Happens When You Do CP Without Discipline > This isn’t one of those "how I became Candidate Master in 6 months" stories. > This is what happens when you say "I’ll do it tomorrow" for 3 straight years. I’m not red. Not purple. Hell, I’m not even consistent. I’m just someone who started CP with big dreams — and then made every mistake possible. If you’re stuck, lazy, unmotivated, scared, or feeling like you’re not improving... **Read this before you waste the same time I did.** --- ## Mistake #1: Practicing only when I felt motivated I’d solve 5 problems in one random burst, feel proud… and then disappear for 10 days. I blamed mood, college, stress, sleep. But here’s the thing: > CP doesn’t care how you feel. > If you're not consistent, you're not improving. --- ## Mistake #2: Clicking the editorial the second I got scared I’d read the statement. Felt hard. Editorial. Copy-paste. Move on. And then I told myself, "Well, at least I understood the idea." No. I didn’t. > I skippe...

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Codeforces Round #583 (based on Olympiad of Metropolises) (div. 1 + div. 2) <center> <img src="/predownloaded/54/0a/540a66678ee10f0d18badd30bb16d840222a106f.png" style="width: 30.0%;max-width: 100.0%;max-height: 100.0%;"> </center> Hi everybody! These days Moscow is conducting the 4th International Olympiad of Metropolises that is an international competition for high school students from biggest cities and capitals all around the world. One of the disciplines of the competition is informatics. Rounds of the competition were prepared by the jury members invited from St. Petersburg, Minsk, Belgrade and Moscow olympiad scientific committee which you may know by Moscow team Olympiad, Open Olympiad in Informatics and Moscow Olympiad for young students (rounds <a href="https://codeforces.me/blog/entry/21185">327</a>, <a href="https://codeforces.me/blog/entry/23309">342</a>, <a href="https://codeforces.me/blog/entry/43615">345</a>, <a href="https://codeforces.me/blog/entry/47769">376</a>, <a href="https://codeforces.me/blog/entry/50613">401</a>, <a hr...

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New Extension for AtCoder Hey everyone at Codeforces!! Codeforces is a really well structured website, it is really easy to navigate to a problem and track your peers. Atcoder on the other hand, though it does has some cool features feel hollow when compared to Codeforces. It is like being surrounded by walls. So I have implemented a few features which are already present on Codeforces in AtCoder. I used Kenkoooo API to fetch rating for each problem and did get some inspiration from CF Analytics. Here are the features and the link to extension of course!! **Link for the extension:** [AC Analytics](https://chromewebstore.google.com/detail/ac-analytics/fbliobpicoanacbncphlgaghdkodkgme) Key Features 1. Activity Calander : Is added to better track your progress like in Github and Codeforces. 2. Problems Solved by Rating : See what you had been solving and up solve when needed. 3. Unsolved Problems : Easily identify and tackle unsolved problems to improve your skills. 4. Submission Histo...

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[Consistency] Finding Motivation Hello, CodeForces! Recently, one of my students had a really bad contest. Even though he worked really hard in the last couple months, he could not pass an important qualifying round of an arguably easy, new, Romanian contest. The first 4 'official' contestants qualified, and sadly he was the fifth. He was really upset after the contest, and had a hard time gathering enough motivation/discipline to continue working, because there were scenarios in his head such as "what if this will happen in training camp?" or "what not passing had a really bad turn on my future?" Today, I am going to share with you all a simple method that can help you get over a bad contest or just motivate you to work more in general. Keep in mind, I am not a specialist in this domain, I am only a teacher with experience, so there might be better methods out there, but throughout the years I have seen that what you are about to read worked best on many of the my students. I advise you to also read this great ...

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Introducing Daily CF— Your Smart Problem Recommender for Codeforces Hey everyone! =============  I’m excited to share something I’ve been working on — a Chrome extension called Daily CF. It’s built to make your Codeforces practice more focused, consistent, and effortless by recommending daily personalized problems right inside the Codeforces interface. ### What is Daily CF? Daily CF is a minimal, integrated extension that adds a new section named “→ CF Daily” to your Codeforces sidebar. Every day, it suggests a small set of problems tailored to your current rating and problem history — so you can start solving instantly without wasting time deciding what to do next.  ### Key Features **Daily Personalized Problem Set** Each day, Daily CF selects a fresh batch of unsolved problems near your current rating range using the Codeforces API. You can also refresh manually anytime with the “Find”...

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Meritocracy, Intelligence, and the Uncomfortable Question at the Heart of Competitive Programming Competitive programming communities are built upon a deeply appealing idea: that performance is earned. The premise is straightforward. Those who study more, practice more, and persist longer will eventually rise. Ratings, in this view, are not merely measurements of skill but reflections of effort, discipline, and commitment. It is a narrative that resonates because it feels fair. Everyone enters the system under the same rules, and the number beside their name appears, at least on the surface, to reflect what they have achieved. Yet beneath this narrative lies a question that is rarely discussed directly, perhaps because it is uncomfortable to even phrase correctly. To what extent do ratings reflect improvement over time, and to what extent do they simply reveal what was already there in the first place? Anyone who has spent enough time in the community has witnessed a pattern that is difficult to ignore. Two participants may begin learning at roughly the same time, use similar...

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CAMA contest 2nd edition Hello Codeforces! I am pleased to invite you to CAMA (Amateur Mathematical and Algorithmic Competition) 2nd Edition. CAMA is a mixed competition of mathematics and informatics founded by Spanish international medallists in said disciplines. The competition will be split into several divisions to make it a more enjoyable experience for everyone. There will be different categories based on studies (high school and college) and level (basic and advanced). The basic division is intended for those who have never participated in a mathematics or informatics competition before, while the advanced division is focused on contestants who are already veterans. The contest will take place on the 23rd and 24th of November. More info on [our web](http://camacontest.org). A total prize of 500€ is going to be divided among the winners of all the divisions, with such distribution yet to be determined. More information will be posted in a few days. If you want to stay in touch with everythin...

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Invitation to Winter Coding Contest 6.0 — Organized by ACM, VNRVJIET  By **ACM VNRVJIET** Greetings, Coders! We are excited to announce **Winter Coding Contest 6.0 (WCC 6.0)**, a national level flagship event of the [ACM](https://vnrvjiet.acm.org/) Student Chapter at VNRVJIET, Hyderabad. This competition features an impressive prize pool of 55,000 INR. WCC 6.0 is open exclusively to students who are currently pursuing a B.Tech programme and will be conducted in two rounds, with the first round being completely free and the final round taking place offline at **VNR VJIET**. **Team Size : 1–2** Participants can register individually or as a team of 2. Participants from different colleges, branches, and disciplines can form a team. Each participant can be part of **only one team**. **Round 1 :** [Tuesday, October 13th, 2026, 8:30 PM – 10:00 PM IST](https://wcc6.pages.dev/) A **90-minute online codi...

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Codeforces Round #507 (based on Olympiad of Metropolises) <center> <img src="https://codeforces.me/predownloaded/1e/86/1e865ca9b49968024cce40b66479f540d7757aed.png" style="width:30.0%; max-width: 100.0%; max-height: 100%"></img> </center> Hi everybody! These days Moscow is conducting the 3rd International Olympiad of Metropolises that is an international competition for high school students from biggest cities and capitals all around the world. One of the disciplines of the competition is informatics. Rounds of the competition were prepared by the jury members invited from St. Petersburg, Minsk, Belgrade and Moscow olympiad scientific committee which you may know by Moscow team Olympiad, Open Olympiad in Informatics and Moscow Olympiad for young students (rounds [327](https://codeforces.me/blog/entry/21185), [342](https://codeforces.me/blog/entry/23309), [345](https://codeforces.me/blog/entry/43615), [376](https://codeforces.me/blog/entry/47769), [401](https://codeforces.me/blog/entry/50613), [433](https://codeforces.me/blog/en...

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100 days into competitive programing Hey everyone! This is my first blog and I'm not a native speaker so I'm sorry for any grammar mistakes I might make here. I've tried to start in competitive programming at the end of September after the ICPC South America Brazil, but i was so bad at this that i got frustrated and i gave up pretty quickly. Some time later, in October i started to study it and try to get better at this for real. Today is the 100th day I've been doing problems every single day (I personally didn't think i would get this far but here we are). I had a personal goal to become pupil by the end of 2025 but i couldn't make it by then. **BUT** in the Hello 2026 for the first time I've done 4 questions in a global round and reached it!! (i ended up falling to newbie again in the last div.3 but its alright)  #### Why I'm posting this blog Well, apart from celebrating my achievement, i want to encourage some people that might...

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Announcing the Coding League - Code212 UCA Competitive Programming League! Hello Codeforces community! =========================== My name is Zakaria, and I’m excited to present a new initiative created and organized by the ENSA Marrakech Computer Science Club, open to all students of Université Cadi Ayyad (UCA). This project is designed by students, for students, with one clear mission: Build a strong competitive programming culture across all UCA institutions and help students grow into ICPC-ready competitors. What is the Coding League &mdash; Code212 UCA CP League? The league is a continuous, long-term program built around biweekly (once every two weeks) contests. It includes: - Official biweekly contests to track progress - Guidance for beginners and challenges for advanced students - A community linking students from ENSA Marrakech, FSSM, FSTG, ENSA Safi (UCA), and other UCA institutions Whether you’re completely new to CP or a seasoned solver—we welcome everyone. Awards & Recognition -------------------- We strongly beli...

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Totally irrelevant content Since there are so many blogs which are totally unrelated to competitive programming but gaining tons of upvote, I think that posting my writing when I am grade 10 should also gain at least 10 upvote. Dear Editor, I am writing to express my opinion on the phenomenon that some parents in Asia countries are installing apps on their children’s mobile phones that can monitor their activities to ensure that they use these devices responsibly. Nowadays, more and more children have their own mobile phones. Hence some parents want to control their son’s or daughter's activities on the Internet. However, I do not agree with these actions. Firstly, this kind of action makes children feel untrusted. Children and adolescents are at a stage of mental development. They require parents’ love and trust, to develop their minds in a healthy way. In contrast, installing apps on their phone will lead to them thinking that their parents do not trust that they can use their phone responsibly. The...

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Code of Thrones — Team Coding Contest We are excited to announce **Code of Thrones**, a team-based programming contest organized by **LCS (Learn Code Solve) from IIIT Surat**. The contest consists of an online screening round on Codeforces (11th February) followed by an offline final event (14th February). Inspired by the ICPC-style format, this event tests teamwork, problem-solving ability, speed, and accuracy under pressure. --- ## Event Timeline - Online Screening Round: 11th February (Codeforces) - Final Event: 14th February (Offline at IIIT Surat) --- ## Event Details - Mode: Team-based contest - Team Size: Exactly 3 participants - Format: ICPC-style - Duration: 2 hours - Problems: 6 algorithmic problems - System: One laptop per team ### Ranking Criteria - Number of problems solved - Total time taken --- ## Competition Format - Jumbled algorithmic problem set - Teams work together on a single system - Solutions must pass all test cases to be consider...

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Eid Mubarak Eid Mubarak, Fellow Coders! As the crescent moon shines bright, marking the end of Ramadan, I want to take a moment to wish everyone in the Codeforces community a very Happy Eid! May this joyous occasion bring you peace, happiness, and countless successful submissions with no TLEs or MLEs! Competitive programming, much like Ramadan, teaches us patience, perseverance, and discipline. We spend hours debugging, optimizing, and learning from our mistakes—just as we do in life. On this special day, I also want to extend a warm welcome to all newcomers and fellow Python users! Python is a beautiful language, but let’s be honest—it’s not always the fastest when it comes to competitive programming. So, as we celebrate Eid, let's also share knowledge and help each other grow. If you have any tips to avoid TLE (Time Limit Exceeded) and MLE (Memory Limit Exceeded) while using Python in contests, I’d love to hear them! Some techniques I try to use include: - Using sys.stdin.read for...

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Cheaters got hacked so didnt get skipped? Hi everyone, so there are a few OBVIOUS cheaters in the last div3 who used a solution in problem F, that has a block of code <spoiler summary="Code"> ~~~~ f=dp2[40][70][70]; fo(i, 0, n+5){ fo(j, 0, k+5){ dp1[i][j]=f; } ~~~~ </spoiler> So [user:chromate00,2024-08-14] and a few others went on hacking spree and hacked a LOT of these solutions , but rather than the contest getting skipped for these cheaters entirely, it was just that this problem got hacked and the others still remained as valid submissions. 3 examples: [user:mayank_raj5,2024-08-14], [user:pawandev,2024-08-14] and [user:hello.313,2024-08-14] . Now in the last div1+2, a hell lot of cheaters were SKIPPED and rightfully so but does hacking prevent being skipped? And also whats a bit fascinating is 2 of these cheaters claim to be from IITs, so it just shows you that college and all is fine , but at the end it will come down to YOUR character and discipline. (A bit of motivation, lol). ...

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NowCoder Summer Multi-School Training Camp 2025 Hello, Codeforces! As the official team of NowCoder (China's leading programming competition platform), we are pleased to introduce the 2025 NowCoder Summer Multi-School Training Camp! This annual event has been running for eight years. Since the summer of 2018, we have collaborated with top competitors from algorithmic competitions such as ICPC, NOI, and IOI, aiming to enhance participants' programming skills through competitions, lectures, and exchanges, and to prepare for upcoming competitions like ICPC and CCPC in the second half of the year; simultaneously, we seek to foster learning and exchange among university training teams worldwide. <center> <h2 style="border-bottom: 1px solid #000;">Details</h2> </center> 1. **Schedule**. Consistent with last year, this year's training camp will consist of ten ICPC-style competitions, starting on [Tuesday, 15 July 2025<sup title="timezone offset" style="font-size:8px;" data-immersive-translate-walked="24cdac9c-eeae-41da-aef2-9dcf...

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A little story When an animal's daily obligation gives nothing but shit to him in return, it loses the will to keep going. It becomes desensitized to its living experience. It refuses to eat. It dies of its own accord. Does the animal bring such misery upon himself? Does it enjoy feeling the self-pity? Does it expect sympathy for its misfortunes from its mates? The animal begins to ponder this and try to counteract it each day. The essence of its ongoing existence is simply its logical understanding that life is practice and practice is life. Hardship is the very point of existence. But why? Why when he gets absolutely nothing in return? He does not know. He does not know if all his problems have been created out of thin air simply for its own sake. He does know one thing though: he is disappointed in himself. He has given what he can and life has had only a steaming bowl of shit to give to him in return. Or maybe it was him serving the feces to himself. Each day he sees his mates grow and learn more...

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Purpose of Life This is a follow up to my previous blog [The Atman](https://codeforces.me/blog/entry/103933). This question might arise once you have read and tried to understand the blog: _If my real nature is that of Brahman(or Atman), what is the purpose of my physical life? Why should I go through the struggles of life, follow a sincere disciplined spiritual life leading to gradual spiritual awakening only to realise that I am Brahman which I already was?_ The answer is that this question itself is wrong (please read till the end, you will realise the meaning of it only then). Now this may not sound like a satisfactory answer at first. The answer you all might be expecting is some sort of logical explanation. But what really is an explanation? An explanation is providing some sort of cause to an effect. We see an effect, we want to hear some sort of cause for it. Let's take an example. The grass is wet. Now what type of answer would satisfy me? Something like it rained or the sprinkler wa...

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Topic-wise practice resources Today, I will be sharing some topic-wise practice resources... Practice by Topic – Recommended Resources: **YouKn0wWho Academy** is a platform where problems are organized topic-wise, and each topic contains standard problems sorted by difficulty levels such as Easy, Medium, Hard, and Very Hard. This site is extremely useful for beginners because it provides a clear learning path — which topic to learn first, and what to study next. It also suggests the appropriate problem rating for each topic, helping learners improve step-by-step. Overall, it's a great resource for beginners to build a strong foundation. (https://youkn0wwho.academy/topic-list) **LightOJ** offers a topic-wise problem list with categorized difficulty levels such as Easy, Medium, and Hard. A big advantage is that it also includes previous ICPC problems, making it a perfect platform for competitive programming preparation. Highly recommended for intermediate-level learners. (https://lightoj.com/pro...

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Dive in Thoughts ### A Dive Into Thoughts — And How Not to Lose the Idea That Brought You ================== ------------------ ### Every developer remembers the moment an idea first appeared. ### ### It was simple. ### Clear. ### Almost obvious. ### ### Maybe it was a solution to a bug. ### Maybe a product idea. ### Maybe a side project you couldn’t stop thinking about. ### ### At that moment, the idea felt alive. ### ### Then we did what developers do best — ### we started thinking deeply. ### ### And somewhere in that depth, many ideas slowly disappear. ### ### Not because they were bad. ### But because they drifted. ### Deep Thinking Is a Gift — But It Has a Shadow --------------------------------------------- ### Thinking deeply is our strength. ### We question edge cases. ### We optimize. ### We prepare for scale. ### We imagine everything that could go wrong. ### ### But deep thinking has a shadow side. ### ### Sometimes we go so deep that we forget ...

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Advice for getting into USACO platinum/camp? I am currently in USACO Silver but considering my CF performance I will probably ICP to gold in one contest. According to multiple sources my CF rating corresponds to high gold or low platinum, but I still don't feel very confident in my USACO abilities. This blog is directed towards people who are in USACO platinum or camping. If you are not in either then you can still comment if you have something useful to say. I'm willing to bet most people with a rating below 1600 don't have much useful to say. I know these advice blogs are redundant but I could not find much about this. Most advice is about to start but there's nothing when you're far beyond starting. So here are my questions: 1. What did you do to practice? Currently I am doing USACO guide gold problems I feel like doing and will eventually start doing random actual USACO gold problems. Should I be doing something more focused? Should I try oj.uz? 2. How to practice implementation? The only thing I could think of i...

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Urge to go into Development Side of Things Hello everyone, I am sharing my thoughts with the community as to in what position I am, or what I feel right now. I do not know how exactly to describe it even. I have been inconsistent at CP since I started college due to various reasons, but mostly due lack of self-discipline, If I am being very honest. Just before a few months I learnt Graphs which was a thing that I feared because of this Image that I had created in my mind about it(I thought that Graphs would be highly complex to describe with programming and manipulating them would be even more difficult). But after giving myself push and learning through a paid course from this [site](https://codingblocks.com/) which me and my collegemates crowdfunded because we are super poor(Joking), I was able to overcome that fear and I feel as if my skills have increased but that is not very well reflected at CP because I personally feel that along with the skills of DS and Algorithms, CP is also a sport of practice and consistency both ...

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2025: A year of growth and optimization The Numbers That Tell a Story When I look at my profile stats, I see more than just numbers—I see dedication: **279 problems solved in just three months** **60-day solving streak maintained consistently** **137 problems solved in the last month alone** **Peak rating: 1236 (Pupil rank achieved!)** But the most meaningful number? That first time I saw "Pupil" next to my name. It wasn't just a color change from gray to green—it was validation that consistent effort pays off. The Journey to Pupil I still remember the nervous excitement before contests, the frustration of getting Wrong Answer on test 2, and the rush of finally seeing "Accepted" after debugging for hours. Each contest taught me something new: Problem-solving isn't just about knowing algorithms—it's about thinking clearly under pressure Consistency beats occasional bursts of motivation Every wrong submission is a lesson, not a failure The grind through UV problems and maintaining my CP practice streak wa...

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I fail every time. It seems so often to me that I am going to try my best for a specific work yet after some days that motivation fades away. All my plans that were to be done with utmost discipline are just some notes in the paper which I don’t even look back at after writing. Judging by my daily activities and my own vision towards life, I have finally crowned myself as a loser. This is my way of living for the past few years. Maybe I am good in some field but when it comes to performing I always fail. I always have a self-doubt that I am going to make a mess of it and even if I make myself confident enough to do that work, the result is nothing different. The world is filled with super smart, happy, passionate, confident and positive thinkers and they somehow know what they must do and how to do. And here I am who has always failed in every field and situation. Honestly, I have never given much dedication to my work, but how could I be dedicated when I always fail in the very processes of that work! M...

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Pupil in 80 days — Day 32-47(Week 5,6) ### Hello codeforces!!! These 2 weeks turned out to be very bad. I was suddenly so lazy that I didn't even want to go to CF at all. It seemed to me that I couldn’t do anything about it at all. But as one person advised me, the best thing to help with burnout is rest. These 2 weeks I did almost nothing in CP, except for 5 solved level 900 problems (shame) and participation in 2 competitions. By the way, about round 940 &mdash; I was SO CLOSE TO SOLUTION B, but my carelessness turned out to be a huge mistake. I initially thought that the array should only consist of positive numbers, but the next day I just noticed that the array could consist of zeros too.This failure depressed me even more, and I did nothing at all until today's contest. After finishing today's contest, I finally gathered the strength to write this blog. The most important thing in achieving a goal is discipline. Even if you feel destroyed, discipline will help you get back on your feet. From today I am doing everyt...

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Ramazan Mubarak Everyone!  Assalamu Alaikum! The blessed month of Ramazan (Ramadan) has arrived — a month of mercy, patience, self-discipline, and spiritual growth. For Muslims around the world, Ramazan is not only about fasting from food and drink, but also about: Improving our character Practicing patience Helping those in need Strengthening our connection with Allah

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Deltix Educational Resource We are excited to announce a new educational resource that is coming soon under the **Deltix** umbrella. Here is a list of paid part-time positions for teachers who want to join our rock star team: - Math & statistics - Algorithms & data structures - Data science - Advanced programming languages - Systems architecture - Networks and clouds - Practical time-series analysis - Machine learning - Security - Real-time backend (architecture) - Operating systems - Product strategy, vision, marketing and innovation Each discipline will include lectures and practical exercises. Some of them will also offer mentorship for the final project. Our resource will not be publicly available. Excited about the opportunity? Complete the form at https://forms.gle/spXr3DaSYmRYePER9 and we will get back to you with further information. Fill free to drop us a line at [email protected] if you have any questions.

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Buccaneers security can not quit Team QB Attracted Brees past due throughout 16-14 loss TAMPA, Fla. – The actual Tampa Bay Buccaneers performed solid defense in opposition to Came Brees till a overdue push from the New Orleans qb create a game-winning industry goal for the Team. Garrett Hartley quit the 27-yard discipline target because occasion terminated to own Saints a new weather-delayed 16-14 success and their fourth successive conquer their own National football conference Southerly rivals upon Sunday. Brees had been sacked 4x, bumped around quite a lot increasingly chucked the interception that's returned for a landing. Brees shrugged from the error that will provided Tampa bay Bay charge at the start of your fourth quarter to finish 3 directly goes by regarding Fifty four meters to steer they (2-0) in place for you to get. "You've got to help make a lot more has compared to what they create," Polk These types of linebacker Builder Promote stated. "You've got a chance to suggestion your current loath in order to Attracted Brees with his fantas...

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1000 Problems in 100 Days: My Coding Marathon Begins Hello, codeforces! Starting today, I’m embarking on a bold challenge: solving 1000 competitive programming problems in 100 days. That means 10 problems a day — no excuses. My goal is simple but ambitious: improve my problem-solving skills, develop discipline, and build momentum in mastering algorithms and data structures. Every day, I’ll set up a mini contest for myself, solve it, and publish a blog post with an editorial-style breakdown of the problems and my approach to solving them. This blog series will document the journey — the struggles, the growth, the unexpected insights, and the daily grind of becoming better at coding, one problem at a time.

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Stack short Notes -> Stack is a collection of elements which follow discipline LIFO (Last -in First -Out) for ex:- # if car is parked in a lane # Balls in a cane ADT (Abstarct Data Type) of STACK -> It contain data representation and operations in the stack ADT stack Data:- 1. Space for storing elements 2. Top pointer operations:- 1. Push(); 2. Pop(); 3. Peek(index); 4. StackTop(); 5. isEmpty(); 6. isFull(); -> We can use Array and Linked List for implementation of stack; -> Insertion is always from end , so time complexity of insertion is 0(1) ----Stack using Array---- Structure of Stack :- Struct Stack{ int size; int Top; int *s; } or class Stack{ public: int size; int Top; int *s; } In Main:- int main() { Stack st; st.data = 5; st.s = new int(st.data); st.top = -1; return 0; } Empty Conditions:- If(Top == -1); Full Conditions:- If(Top == S...

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New server for CPers to discurss I have created a Discord server called wa on test 2 (lol i have no idea ngl) for people who are interested in Competitive Programming. The purpose of this server is to build a focused and supportive community where CPers can discuss algorithms, share problem-solving ideas, and learn from each other. The server includes channels for problem discussion, solution analysis, contest discussion, daily practice problems, and resource sharing. There is no requirement for a high rating or advanced background. The only expectation is consistency, willingness to learn, and the motivation to improve together. If you are studying Competitive Programming on your own and want a place to practice, exchange ideas, and stay disciplined, wa on test 2 is open to you. this is the server link: https://discord.gg/xqA4W9a4eq

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which academic discipline corresponds to what we do at programming contests? which academic discipline corresponds to what we do at programming contests?</p>contests like codeforces, topcoder, google codejam, ICPC and other similar contests.

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First Order? SFME I thinks it's time the schedule of CF rounds be more organized, there have been 14 days in which there hadn't been any contest and weeks there had been 3 contests in a row. I am aware that there might be difficulties for problem setting and the times should be flexible, but there are other platforms having this flexibility but also having a weekly routine. It's a pity a nice platform like Codeforces with all its capabilities has little discipline.

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New Year, New Commitment A new year has started, and I want to make a clear commitment to myself. Last year I wasted time on useless things and lacked consistency, but this year I want to change that. I want to dedicate myself fully to competitive programming, practice daily, participate seriously in contests, and focus on improving my thinking and problem-solving skills. My main goal for this year is to reach Candidate Master on Codeforces. I know it won’t be easy, but with discipline, consistency, and honest effort, I believe it’s achievable. This blog is a reminder to myself to stay focused and not give up.

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2027 Goal I've been on this website for 4 years and I'm still grey, disgusting. I'm unemployed and my life has nothing to do with coding at this point, but I will hit expert to demonstrate a baseline of discipline to myself . Plan: At my level any plan is probably ok as long as I stick to it... lol

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Jobs Hello, I was wondering what are the most programming jobs/discipline related to competitive programming? Best :)

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Need Guidance Sorry to bother you with an annoying question! I have been practicing question at 1500 rating range and i encounter many ad-hoc, greedy problems. Many a times i spend hours(at most 2 btw) on a question and i am not able to solve it.Since the question was greedy i sometimes feel i wasted a lot of time as i am not sure if i'll ever get to use what i learnt in the question again. **So i am in dilemma if i should practice questions topicwise like from CSES or continue my current strategy of solving around 30-35 questions of each rating or until i feel comfortable in that range.** Also should i go on a limb and do like 100 div D problems to try to get to expert in a month since i almost have a month long break from uni? Also things like number of questions doesn't matter and other things i feel don't work on me and i think having a disciplined approach like solving a certain number of questions like a task would be more helpful.

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Problem solving Definition ================== The term problem solving has a slightly different meaning depending on the discipline. For instance, it is a mental process in psychology and a computerized process in computer science. There are two different types of problems: ill-defined and well-defined; different approaches are used for each. Well-defined problems have specific end goals and clearly expected solutions, while ill-defined problems do not. Well-defined problems allow for more initial planning than ill-defined problems.[2] Solving problems sometimes involves dealing with pragmatics, the way that context contributes to meaning, and semantics, the interpretation of the problem. The ability to understand what the end goal of the problem is, and what rules could be applied represents the key to solving the problem. Sometimes the problem requires abstract thinking or coming up with a creative solution. #### Eng salah.

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The Beginning :) This is the very first blog I have ever written. Hopefully it is not my last. My current goal right now is to be a software engineer. That is one of the main reasons I have decided to start doing competitive programming. I also want to improve my programming skills exponentially. However as humans we are constantly faced with different challenges in life. Regardless I want to prove to myself that I can with stand and endure through all the tough times. I was born and raised in a christian family. Growing up I used to always go to church. Recently in my life, after getting rejected and encountering failures, I decided to examine myself. One of the major basic foundational error I encountered was that I was not disciplined towards my goals. In a way I had been a slave to surrounding distractions. Recently it got to the point where I was very tired of getting distracted. Hence I made a rule for myself. At the moment there was a bracelet near me which said, "Student Scholar". I then pi...

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Why is there still no one in competitive programming who surpasses Gennady Korotkevich? Several factors contribute to why no one has surpassed Gennady Korotkevich in competitive programming: Gennady began programming at a very young age, guided by his parents who are both programmers. His early exposure and continuous participation in competitions since the age of 11 have given him a significant head start and extensive experience. His ability to consistently perform at the highest level in various competitions suggests a natural aptitude for problem-solving and algorithmic thinking. His success in solving complex problems quickly and accurately is a testament to his deep understanding and innovative approach. Korotkevich's accomplishments span a wide range of competitions, including the IOI, ICPC, Google Code Jam, Facebook Hacker Cup, and many more. This diversity showcases his versatility and ability to adapt to different problem sets and competition formats. Despite his numerous victories, Korotkevich continues to participate and excel in competitions, demonstratin...

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Starting fresh I wonder if I will get back into this frequently enough as I intend to. Self-discipline. Let's see if it works. Starting anew over here. You're free to refriend me. http://codeforces.me/profile/bTackt

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Digital Privacy on Social Media An understanding of digital privacy, how it works, how it influences the society and the communication process, and its most significant threats are essential. The kind of difficulties that might occur, as well as the benefits for the society from the different points of view, can assist in implementing more control of digital privacy in social media. The ways of managing digital privacy in the future will also be discussed. According to the [custom statistics projects](https://mid-terms.com/statistics-research-projects) information, nowadays the notion of privacy is very unclear. Nowadays, the digital privacy of personal information and online security is a hot issue due to the rising threat of piracy and hacking of personal data. Cases of digital crime and piracy are not infrequent. Therefore, the government and the society should consider this topic and develop reliable system or platform to protect people and regulate Internet procedures. First of all, contemporary users should de...

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