| # | User | Rating |
|---|---|---|
| 1 | Benq | 3676 |
| 2 | Kevin114514 | 3659 |
| 3 | jiangly | 3640 |
| 4 | turmax | 3450 |
| 5 | tourist | 3382 |
| 6 | strapple | 3360 |
| 7 | Um_nik | 3354 |
| 8 | squareOf105 | 3348 |
| 9 | maroonrk | 3312 |
| 10 | idontwannadothis…e | 3191 |
| # | User | Contrib. |
|---|---|---|
| 1 | Qingyu | 158 |
| 2 | nik_exists | 151 |
| 3 | maspy | 149 |
| 4 | AmShZ | 144 |
| 5 | Um_nik | 143 |
| 6 | Errichto | 139 |
| 7 | adamant | 137 |
| 8 | BledDest | 133 |
| 9 | maroonrk | 132 |
| 10 | Proof_by_QED | 131 |
Hello Codeforces!
We're happy to announce that this fall, we are bringing a unique in-person competition for school students aged 13–19 to seven locations across five countries.
This is not your usual coding contest. Great developers don’t just write code — they know where it breaks, too. Your challenge is to put solutions to the test, find hidden bugs, and earn bonus points for identifying isolated issues.
Hello Codeforces,
Are you a high school senior with strong coding skills looking for an intense Computer Science bachelor’s program with fully-funded scholarships available?
Applications are about to close for the JetBrains Foundation-backed CSAI BSc Program (Computer Science and Artificial Intelligence) at Neapolis University Pafos (Cyprus).
Experienced coders can secure a fully-funded JetBrains Foundation scholarship, which includes:
Why this program?
Crucial dates:
Wondering what the entrance test tasks look like? To help you feel confident and know exactly what to expect, we’ve put together a two-hour preparatory test on our website. If you can solve at least six out of the nine problems, you are perfectly prepared for this program!
Don't miss out on a fully-funded ticket to your future!
Hello Codeforces!
Kotlin Heroes: Episode 14 has wrapped up, and what an exciting round it was! Thanks to everyone who joined the contest, solved problems, and made this round another great Kotlin Heroes event.
We’ve already had many amazing rounds of the Kotlin Heroes series, and it’s incredible to see the community grow with each episode. Once again, we are proud to celebrate the true heroes of Kotlin who rose to the top and earned well-deserved prizes.
Top 3 contestants are:
Kotlin Heroes T-shirts will go to the top 50 contestants:
These participants, who solved at least one problem, were randomly selected to receive special Kotlin Heroes T-shirts:
We’ll be in touch soon to coordinate prize delivery. Some participants from the previous round are still waiting for their Kotlin Heroes T-shirts due to shipping delays. We are working to resolve this and will make sure everyone receives their prizes. Thank you so much for your patience!
It's great to see new people learning Kotlin and performing brilliantly in the competition. Want to keep practicing? Challenges from all 14 previous rounds are available here: Episode 1, Episode 2, Episode 3, Episode 4, Episode 5: ICPC Round, Episode 6, Episode 7, Episode 8, Episode 9, Episode 10, Episode 11, Episode 12, Episode 13 and Episode 14.
If you’d like to sharpen your Kotlin skills, start with:
Stay tuned for future rounds, and we hope to see you again in the next Kotlin Heroes contest!
Hello Codeforces!
We’re excited to invite you to a brand-new AI-native competition from JetBrains — not your typical algorithm marathon. Meet the Blackbox Cup, happening on March 15, 2026.
TL;DR: The Blackbox Cup is here to give you a fun (and challenging) taste of working with unknown systems, messy constraints, and missing context, with any tools allowed (yes, even AI! 🤯).
Hello Codeforces!
Kotlin Heroes: Episode 13 brought together many talented participants, and we’re excited to share the results. Massive congratulations to the coders who tackled the challenges of Kotlin Heroes: Episode 13 and came out on top!
Top 3 contestants are:
Kotlin Heroes T-shirts will go to the top 50 contestants:
These participants, who solved at least one problem, were randomly selected to receive special Kotlin Heroes T-shirts:
We’ll be in touch soon to coordinate prize delivery.
It's great to see new people learning Kotlin and performing brilliantly in the competition. Want to keep practicing? Challenges from all 13 previous rounds are available here: Episode 1, Episode 2, Episode 3, Episode 4, Episode 5: ICPC Round, Episode 6, Episode 7, Episode 8, Episode 9, Episode 10, Episode 11, Episode 12 and Episode 13.
And if you’d like to see how the top competitive programmers approach these challenges, check out ecnerwala and SecondThread solving problems from this practice round live on stage at the ICPC World Finals in Baku. If you’d like to sharpen your Kotlin skills, start with:
Good luck, and have fun with Kotlin! Until next time, heroes!
Announcement of Kotlin Heroes: Episode 13
Hello Codeforces!
A big round of applause to the Kotlin Heroes: Episode 12 winners! And to everyone who participated – thank you! You made this round a blast.
Top 3 contestants are:
Kotlin Heroes T-shirts and keychains will go to the top 50 contestants:
These participants, who solved at least one problem, were randomly selected to receive special Kotlin Heroes T-shirts:
We’ll be in touch soon to coordinate prize delivery.
It's great to see new people learning Kotlin and performing brilliantly in the competition. Want to keep practicing? Challenges from all 12 previous rounds are available here: Episode 1, Episode 2, Episode 3, Episode 4, Episode 5: ICPC Round, Episode 6, Episode 7, Episode 8, Episode 9, Episode 10, Episode 11 and Episode 12.
If you’d like to sharpen your Kotlin skills, start with:
Good luck, and have fun with Kotlin! Until next time, heroes!
Hello Codeforces!
Hello Codeforces! As we wrap up another exciting round of our Kotlin Heroes series, it’s time to celebrate the champions who navigated the challenges like pros. With high stakes and impressive typing speeds, we witnessed incredible talent. Join us as we highlight the winners!
The top three contestants:
A Kotlin Heroes T-shirt and exclusive Kotlin stickers will be presented to:
These participants also won branded T-shirts:
We will contact the winners soon to coordinate the delivery of their prizes!
It's great to see new people learning Kotlin and performing brilliantly in the competition. Challenges from all eleven previous rounds are available for practice here: Episode 1, Episode 2, Episode 3, Episode 4, Episode 5: ICPC Round, Episode 6, Episode 7, Episode 8, Episode 9, Episode 10 and Episode 11.
For those who would like to get to know Kotlin better, take a look at Basic Kotlin (solve Koans), Kotlin Playground, this competitive programming tutorial, and these videos on competitive programming in Kotlin.
We wish you luck and hope you enjoy Kotlin!
Hello Codeforces!
We've already had ten great rounds – how cool is that? We are pleased to congratulate the real heroes of Kotlin, who won prizes this time.
The top three contestants:
A Kotlin Heroes T-shirt and exclusive Kotlin stickers will be presented to:
These participants also won branded T-shirts:
We will contact the winners soon to coordinate the delivery of your prizes!
It's great to see new people learn Kotlin and perform brilliantly in the competition. Challenges from all nine previous rounds are available for practice here: Episode 1, Episode 2, Episode 3, Episode 4, Episode 5: ICPC Round, Episode 6, Episode 7, Episode 8 and Episode 9.
For those who would like to get to know Kotlin better, take a look at Basic Kotlin (solve Koans), Kotlin Playground, this competitive programming tutorial, and these videos on competitive programming in Kotlin.
We wish you luck and hope you enjoy Kotlin!
Hello Codeforces!
We’re absolutely thrilled about the return of the Kotlin Heroes series! Judging by the record-setting number of registrations for Kotlin Heroes: Episode 9, we’re guessing you’ve missed this series as well.
It's great to see new people just getting started with Kotlin already performing well in competitions. The solutions to all eight previous rounds are available for practice purposes here: Episode 1, Episode 2, Episode 3, Episode 4, Episode 5: ICPC Round, Episode 6, Episode 7 and Episode 8
Congratulations to the top three contestants:
A Kotlin Heroes T-shirt and exclusive Kotlin stickers will be awarded to:
These participants have also won branded T-shirts:
We will contact the winners soon to coordinate the delivery of their prizes!
For those who would like to get to know Kotlin better, we invite you to review our Kotlin solutions for the Advent of Code algorithmic puzzles, read our competitive programming tutorial, and watch the videos from our Kotlin in Competitive Programming YouTube playlist.
Good luck and we hope you enjoy Kotlin!
Hello Codeforces!
Kotlin Heroes: Episode 8 was the third round of the Kotlin Heroes series in 2021. The “8” from “Kotlin Heroes: Episode 8” symbolizes our infinite respect for all who participated! We are very happy to see new people learn Kotlin and perform brilliantly in the competition. All the previous rounds are available to be used for practice here: Episode 1, Episode 2, Episode 3, Episode 4, Episode 5: ICPC Round, Episode 6, and Episode 7.
Сongratulations to the top three contestants:
A Kotlin Heroes t-shirt and exclusive Kotlin stickers will be presented to:
These participants also won branded t-shirts:
We will contact the winners soon to coordinate the delivery of your prizes!
The Kotlin Heroes: Episode 8 practice round took place during the ICPC World Finals. Gennady “tourist” Korotkevich, a repeat winner of Kotlin Heroes, was solving the practice round tasks during the event opening. We invite you to watch this presentation.
For those who would like to get to know Kotlin better, we invite you to check out Kotlin Basics track on JetBrains Academy, take a look at basic Kotlin, solve Koans in the free course from JetBrains Educational Products, visit Kotlin Playground, check out the tutorial, and these videos on competitive programming in Kotlin.
More information about Kotlin Heroes contests: https://kotlinlang.org/lp/kotlin-heroes/.
We wish you luck and hope you enjoy Kotlin!
Hello Codeforces!
The second round of the Kotlin Heroes series in 2021 was a great one! Thanks to the authors and all who participated! We are very happy to see new people among the winners. All the rounds are available to be used for practice here: Episode 1, Episode 2, Episode 3, Episode 4, Episode 5: ICPC Round, Episode 6 and Episode 7.
The “7” from “Kotlin Heroes: Episode 7” was the lucky number for this top three contestants:
A Kotlin Heroes t-shirt and exclusive Kotlin stickers will be presented to:
These participants also won branded t-shirts:
We will contact the winners soon to coordinate the delivery of your prizes!
For those who would like to get to know Kotlin better, we invite you to take a look at basic Kotlin, solve Koans in the free course from JetBrains Educational Products, visit Kotlin Playground, check out the tutorial, and these videos on competitive programming in Kotlin.
We wish you all the best and hope you enjoy coding with Kotlin!
Hello Codeforces!
The sixth round of the Kotlin Heroes series recently finished! All the rounds are available to be used for practice here: Episode 1, Episode 2, Episode 3, Episode 4, Episode 5: ICPC Round and Episode 6). Thanks to everyone who participated – you inspire us to work even harder on the problems for the next round, and we think you’re really going to like them!
Congratulations to the top three contestants:
A Kotlin Heroes t-shirt and exclusive Kotlin stickers will be presented to:
These participants also won branded t-shirts:
We will contact the winners soon to coordinate the delivery of your prizes!
Special thanks goes to SecondThread for streaming the solutions of the entire practice round. Check out this wonderful tutorial: https://codeforces.me/stream/203
If you are still new to Kotlin but want to give it your all in the next round, take a look at Basic Kotlin (solve Koans), Kotlin Playground, this tutorial, and these videos on competitive programming in Kotlin.
We wish you all the best and hope you enjoy coding with Kotlin!
Hello Codeforces!
One of the most memorable Kotlin rounds of this year took place just recently. More than 6.7 thousand participants have registered for it. We thank everyone for your interest in Kotlin! Everyone who took part in this round will receive a link to download a personalized online certificate within the next two weeks. Work on this has already started.
Our warm congratulations to the winners of the 1st, 2nd, and 3rd place, who receive cash prizes:
A Kotlin Heroes t-shirt and exclusive Kotlin stickers will be presented to:
And also these participants won branded T-shirts:
Finally, the last, but not least, gift for today: ICPC-experience, an invitation to the Moscow World Finals 2021, all-inclusive on-site (hotel, meals, ceremonies, and swag, are included; visa, flights, transportation to the contest location is not).
And a special recognition prize from the ICPC goes to tourist.
If you are still new to Kotlin you could look into a tutorial on competitive programming in Kotlin and watch these videos on competitive programming in Kotlin. Also, all the previous Kotlin Heroes Rounds are available for practice here: Episode 1, Episode 2, Episode 3, Episode 4 and Episode 5: ICPC Round.
We wish you all the best and hope you enjoy Kotlin.
Discussion of Kotlin Heroes 5: ICPC Round
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 and second Kotlin Heroes competitions which was held previously. Congratulations to the top 3 winners:
Episode 1
Episode 2
Ready to challenge yourself to do better? The third "Kotlin Heroes" competition will be hosted on the Codeforces platform on Feb/27/2020 16:35 (Moscow time). 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. Top three winners will get prizes of $512, $256, and $128 respectively, top 50 will win a Kotlin Heroes t-shirt and an exclusive Kotlin badge, competitors solving at least one problem will enter into a draw for one of 50 Kotlin Heroes t-shirts.
The round will again be held in accordance with a set of slightly modified ICPC rules:
Registration is already open and available via the link. It will be available until the end of the round.
If you are still new to Kotlin we have prepared a tutorial on competitive programming in Kotlin and a practice round, where you can try to solve a few simple problems in Kotlin. All the solutions are open, which means that you can look at the solution even if you haven't solved the problem yet. The practice round is available by the link.
We wish you luck and hope you enjoy Kotlin.
Announcement of Kotlin Heroes: Episode 3
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 Kotlin Heroes competition which was held back in May. Congratulations to the top 3 winners Petr, ecnerwala, and eatmore on their incredible achievement, especially considering they were up against 4,500 other registrants from over 63 countries. We’d also like to give a shout out to tourist for being the only other person, outside of the top 3, to manage to solve every problem set from this round. Well done all of you!
Ready to challenge yourself to do better? The second "Kotlin Heroes" competition will be hosted on the Codeforces platform on the 7th of September, 2019, at 14:35 UTC (17:35 MSK, 07:35 PDT, 22:35 CST). 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. Top three winners will get prizes of $512, $256, and $128 respectively, top 50 will win a Kotlin Heroes t-shirt and an exclusive Kotlin badge, competitors solving at least one problem will enter into a draw for one of 50 Kotlin Heroes t-shirts.
The round will again be held in accordance with a set of slightly modified ICPC rules:
Registration is already open and available via the link. It will be available until the end of the round.
If you are still new to Kotlin we have prepared a tutorial on competitive programming in Kotlin and a practice round, where you can try to solve a few simple problems in Kotlin. All the solutions are open, which means that you can look at the solution even if you haven't solved the problem yet. The practice round is available by the link.
We wish you luck and hope you enjoy Kotlin.
UPD: Thank you for the participation. The editorials are published.
Announcement of Kotlin Heroes: Episode 2
Hello, Codeforces!
We are happy to announce that in partnership with Codeforces to promote Kotlin programming language we are launching a series of "Kotlin Heroes" programming contests.
Kotlin programming language was introduced by JetBrains in 2011 and reached its first stable version 1.0 in 2016. The current language version is 1.3.31. The language is focused on solving the needs of application developers in various domains. Kotlin is a statically typed language that is designed for writing concise code, with less ceremony and more substance in it, and to scale from applications of just a few lines long to multi-million-lines projects.
While not being specifically designed for competitive programming, it incidentally fits well in this domain, reducing the typical amount boilerplate that a programmer needs to write and read while working with the code almost to the level offered by dynamically-typed scripting languages, while having tooling and performance of a statically-typed language.
The first "Kotlin Heroes" competition will be hosted at Codeforces platform on 28.05.2019 17:35 (Московское время). 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. Top three winners will get prizes of $512, $256, and $128 respectively, top 50 will win a Kotlin Heroes t-shirt and an exclusive Kotlin badge, competitors solving at least one problem will enter into a draw for one of 50 Kotlin Heroes t-shirts.
The round is held in accordance with slightly modified ICPC rules:
Registration is already open and available via the link. It will be available until the end of the round.
To help you get familiar with Kotlin we have prepared a tutorial on competitive programming in Kotlin and a practice round, where you can try to solve a few simple problems in Kotlin. All solutions are open, it means that you can look at a solution even if you haven't solved a problem yet. The practice round is available by the link.
We wish you luck and hope you enjoy Kotlin.
UPD 1: Many thanks to the testers elizarov, Benq, cdkrot, nhho, ksun48. Also KAN helped a lot with suggestions to the problems. And to all the participants warm greetings from authors MikeMirzayanov, vovuh, adedalic and pashka — they invented and prepared the problems for you!
Announcement of Kotlin Heroes: Episode 1
