Hola Codeforces!

I am happy to invite you to Codeforces Round 774 (Div. 2), which will take place on Mar/04/2022 18:35 (Moscow time). Notice the unusual time! The round will be rated for participants with rating lower than 2100. You will have 2 hours to solve 6 problems. The problems were authored and prepared by me.

I would like to thank the following people who made the round possible:

• darkkcyan for coordination and help in problem preparation.
• KAN for translating the statements.
• antontrygubO_o, errorgorn, mjhun, wxhtzdy, generic_placeholder_name, Supermagzzz, vinfat, fishy15, phattd, MarcosK, TeaTime, Stepavly, SebaMarin, CarusoX, snowysecret, ak2006, DeMen100ns and helcsnewsxd for testing and providing valuable feedback.
• MikeMirzayanov for great Codeforces and Polygon platforms.

See you in the standings!

UPD:

Scoring distribution: $$$750$$$ — $$$1000$$$ — $$$1250$$$ — $$$2000$$$ — $$$2500$$$ — $$$3000$$$

Thanks to ak2006, video editorials for some of the problems will be available on his channel after the round.

UPD: Editorial

UPD: Congratulations to the winners!

Official winners:

1. lydia1
2. mjhmjh1104
3. Turret
4. Vsinger_MoQingxian
5. WAduck
6. woolim
7. Iam1789
8. yagoo
9. Koba.rde
10. dtc03012

Unofficial winners:

1. Vercingetorix
2. Um_nik
3. hank55663
4. Umi
5. dlalswp25
6. disorientation
7. rainboy

Hello, Codeforces.

In this post, I'll share with you a few recent improvements in Polygon made by MikeMirzayanov, unreal.eugene, DK318 and me.

Polygon is a service to prepares programming problems and contests. It is usually used to prepare problems for olympiads/programming contests but it is also often used to prepare educational content. It is located at https://polygon.codeforces.com/ and is open to everybody.

Here are three recent new features:

• IOI-like Graders for Python
• Problem Materials
• User Groups

Hi Codeforces,

I am honored to present you "Adolescent Grigore Moisil" (AGM) International Programming Contest (8th edition).

AGM is addressed to high school students who can form teams of up to 3 members, ICPC style. The contest has a qualification round on 6th March 2022 at 13:00 GMT. The problems are set up fully by (former) university students.

We are looking forward to international participants. Both the qualification and final round will be held online due to the pandemic situation. You can register here until 5th March 2022 at 13:00 GMT.

Besides diplomas for the first 10 teams in the final round, the first team will receive a prize of 1200 RON, the second team a prize of 900 RON, and the third team a prize of 600 RON.

Finally, I am more than delighted to present you our team: patrick.sava (the heart of the project), average_frog_enjoyer, munteanuvlad98, Stelutzu, Alex18mai, teoionescu, carabet.cosmin, Stefan_Radu, Mihai22e, vreaudelftpls, GinguIonut, caesar2001, georgerapeanu, MiricaMatei, popovicirobert, tinca_matei, Usu and me.

Take a look at our problem-sets from the last edition:

Qualification

Final Round Day1

Final Round Day2

Our website

AGM Facebook

Registration Link

Also, don't hesitate to contact us: [email protected]

Thank you very much,

George

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, Episode 2, Episode 3, Episode 4, Episode 5: ICPC Round, Episode 6, Episode 7, and Episode 8.

Ready to challenge yourself to do better? The [contest:1643] competition will be hosted on the Codeforces platform on [contest_time:1643]. 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 respectively, top 50 will win a Kotlin Heroes t-shirt and an exclusive Kotlin sticker, competitors solving at least one problem will enter into a draw for one of 50 Kotlin Heroes t-shirts.

Registration is already open and available via the link. It will be available until the end of the round.

The round will again be held in accordance with a set of slightly modified ICPC rules:

• The round is unrated.
• The contest will have 9 or 10 problems of various levels of complexity.
• You are only allowed to use Kotlin to solve these problems.
• Participants are ranked according to the number of correctly solved problems. Ties are resolved based on the lowest total penalty time for all problems, which is computed as follows. For each solved problem, a penalty is set to the submission time of that problem (the time since the start of the contest). An extra penalty of 10 minutes is added for each failed submission on solved problems (i. e., if you never solve the problem, you will not be penalized for trying that problem). If two participants solved the same number of problems and scored the same penalty, then those of them who had previously made the last successful submission will be given an advantage in the distribution of prizes and gifts.

If you are still new to Kotlin we have prepared a tutorial on competitive programming in Kotlin and [contest:1645], where you can try to solve a few simple problems in Kotlin. The practice round is available by the link.

We made an announcement about the Kotlin Heroes: Episode 9 practice stream, but unfortunately we had to cancel it. Sorry for the inconvenience!

We wish you luck and hope you enjoy Kotlin.

Hello, Codeforces!

We are glad to invite everyone to participate in Codeforces Round 773 (Div. 1) and Codeforces Round 773 (Div. 2), which will be held on Feb/23/2022 13:10 (Moscow time). Notice the unusual time! The round will be rated for both divisions. Each division will have 6 problems, and you will have 2 hours to solve them. We recommend you read all the problems!

Tasks are based on RocketOlymp, and were written and prepared by __silaedr__, daubi, alegsandyr, ilyakrasnovv, and isaf27.

We are very thankful to

• isaf27 for the great coordination, valuable advice, and patience.

• Renatyss, stepanov.aa, talant, Siberian, kirill.kligunov, arbuzick for the help during discussing and preparing problems.

• Our testers: AlperenT, ArtNext, EvgeniyPonasenkov, FedShat, Qwerty1232, TeaTime, TheEvilBird, ak2006, generic_placeholder_name, philmol, silvvasil, tox1c_kid for their feedback

• pakhomovee for the task, that didn't find its place in the final problemset.

• KAN for helping with round preparation

• MikeMirzayanov for codeforces and polygon platform

Olympiad's participants cannot participate in codeforces rounds simultaneously.

Good luck and have fun!

UPD — Scoring distribution:

div2: $$$500 - 750 - 1250 - 2000 - 2000 - 2500$$$

div1: $$$500 - 1250 - 1250 - 1750 - 2250 - 3000$$$

UPD — Editorial

Hello Codeforces!

On Feb/22/2022 17:35 (Moscow time) Educational Codeforces Round 123 (Rated for Div. 2) will start.

Series of Educational Rounds continue being held as Harbour.Space University initiative! You can read the details about the cooperation between Harbour.Space University and Codeforces in the blog post.

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 adedalic Dalabaev, Vladimir vovuh Petrov, Ivan BledDest Androsov, Maksim Neon Mescheryakov and me. Also huge thanks to Mike MikeMirzayanov Mirzayanov for great systems Polygon and Codeforces.

Good luck to all the participants!

Our friends at Harbour.Space also have a message for you:

Hey, Codeforces!

Once again, it is time for another exciting scholarship opportunity from Harbour.Space!

We have partnered with various tech companies to offer Bachelor’s or Master’s degree scholarships in Computer Science, Data Science, Cyber Security, and Front-end Development and work experience in the partnered companies.

We are looking for various junior to mid-level positions to fill in different fields such as:

• Java Spring / Node.js Back-End Developer
• DevOps Engineer
• Kotlin Web App Developer
• React / React Native Front-End Developer
• Cyber Security Specialist

Requirements:

1. High School Diploma for Bachelor degree applicants or Bachelor’s degree for Master degree applicants
2. Professional fluency in English
3. Previous experience is a must for Master student applicants and a plus for Bachelor student applicants

Make sure to apply before Mar 13, 2022, to be eligible for the scholarship and reduced application fee.

Keep in touch and follow us on LinkedIn for more scholarship opportunities. And follow us on Instagram to evidence student life, events, and success stories from students.

Good luck on your round, and see you next time!

Harbour.Space University

UPD: Editorial is out

Hello, Codeforces!

dannyboy20031204 and I are glad to invite everyone to participate in Codeforces Round 772 (Div. 2), which will be held on Feb/20/2022 17:35 (Moscow time). This Round will be rated for participants with rating lower than 2100. You will have 2 hours to solve 6 problems.

We would like to thank:

• 74TrAkToR for excellent coordination of the round and translating the statements.
• 244mhq, generic_placeholder_name, null_awe, ptd, Fysty, 8e7, yungyao, Devil, amano_hina, Dragonado, DIvanCode, voventa, plagues, Marslai24, FHVirus, saarang, olyazyryanova, marzipan, Prokhor08, sam571128, efimovpaul, ColtenOuO, zarubin, sus for testing this round and providing very useful feedback.
• generic_placeholder_name for providing an awesome problem idea when our problems are rejected by the coordinator.
• 8e7 for verifying our statements and tutorials, correcting many mistakes and making it easier to read.
• MikeMirzayanov for great Codeforces and Polygon platforms.

Score distribution: $$$500 - 1000 - 1500 - 2250 - 2250 - 3000$$$

I hope all of you will enjoy the problems and have a positive delta. GL & HF ^^.

UPD1: Thanks for your participation! Editorial is out.

UPD2: Congratulations to the winners:

Div1 + Div2:

1. jqdai0815
2. eecs
3. MatikaneTannhauser
4. kotatsugame
5. risujiroh

Div2:

1. MatikaneTannhauser
2. disorientation
3. rainboy
4. Bekzhan
5. Vsinger_YuezhengLing

Hello, Codeforces!

I am happy to invite you to Codeforces Round 771 (Div. 2), which will take place on 14.02.2022 17:35 (Московское время). The round will be rated for participants with rating lower than 2100. You will have 2 hours to solve 6 problems. The problems were authored and prepared by me.

I would like to thank the following people who made the round possible:

• Artyom123 for coordination, help in problem preparation and translating the statements.
• KAN for helping with round preparation.
• geniucos and spatarel for discussing problems with me way before the round was proposed.
• gamegame, Kirill22, AlexLuchianov, Monogon, wxhtzdy, generic_placeholder_name, BlueDiamond, Devil, Ziware, Utkarsh.25dec, TeaTime, null_awe, manish.17, gojira, shishyando, snowysecret, ak2006, namanbansal013, viovlo and sus, for testing and providing valuable feedback.
• MikeMirzayanov for great Codeforces and Polygon platforms.

I hope you have no plans for Valentine's Day find the problems interesting and enjoy the round. See you in the standings! ❤

Scoring distribution: $$$500-750-1250-1750-2500-3250$$$

UPD: Thanks to ak2006, video editorials for some of the problems will be available on his channel after the round.

UPD: Editorial is out!

Hello, Codeforces! (づ｡◕‿‿◕｡)づ ❤

On Feb/12/2022 17:35 (Moscow time) we will host Codeforces Global Round 19.

It is the first round of a 2022 series of Codeforces Global Rounds supported by XTX Markets. The rounds are open and rated for everybody.

The presents for this round:

• 30 best participants get a t-shirt.
• 20 t-shirts are randomly distributed among those with ranks between 31 and 500, inclusive.

The presents for the 6-round series in 2022:

• In each round top-100 participants get points according to the table.
• The final result for each participant is equal to the sum of points he gets in the four rounds he placed the highest.
• The best 20 participants over all series get sweatshirts and place certificates.

The problems were written and prepared by Mangooste, TeaTime, __JustMe__ and EvgeniyPonasenkov.

We are very thankful to people, who made this round possible:

• gop2024 for the great coordinating and helping us with preparing problems.
• Our testers: gamegame, dorijanlendvaj, fedoseev.timofey, tfg, fastmath, daubi, Pechalka, Alexdat2000, pakhomovee, Frankenween, philmol, Ultrasanic, tox1c_kid, Viktoriuss and Urvuk3 for their feedback, especially tfg for finding mistakes in the statements.
• MikeMirzayanov for codeforces and polygon platform!
• KAN for his contribution to this round as well.

You will have 2.5 hours to solve 8 problems. And we recommend you to read all the problems!

The score distribution will be announced closer to the start of the round.

UPD: The scoring distribution: 500 — 1000 — 1500 — 2000 — 2500 — 3250 — 4000 — 4000

UPD: Editorial.

Congratulations to the winners:

1. tourist
2. Um_nik
3. Maksim1744
4. heno239
5. ksun48
6. Vercingetorix
7. jiangly
8. SomethingNew
9. Laurie
10. VivaciousAubergine