awoo's blog

By awoo, history, 6 weeks ago, translation, In English

2204A - Passing the Ball

Idea: BledDest

Tutorial
Solution (BledDest)

2204B - Right Maximum

Idea: fcspartakm

Tutorial
Solution (BledDest)

2204C - Spring

Idea: BledDest

Tutorial
Solution (BledDest)

2204D - Alternating Path

Idea: BledDest

Tutorial
Solution (awoo)

2204E - Sum of Digits (and Again)

Idea: BledDest

Tutorial
Solution (BledDest)

2204F - Sum of Fractions

Idea: adedalic

Tutorial
Solution (adedalic)

2204G - Grid Path

Idea: Roms

Tutorial
Solution (Neon)

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By awoo, history, 6 weeks ago, translation, In English

Neapolis University Pafos

Hello Codeforces!

The series of Educational Rounds continues thanks to the support of the Computer Science and Artificial Intelligence (CSAI) program at Neapolis University Pafos, with scholarships provided by JetBrains.

Educational Codeforces Round 188 (Rated for Div. 2) will start on Mar/16/2026 17:35 (Moscow time).

This round will be rated for the participants with rating lower than 2100. It will be held on extended ICPC rules. The penalty for each incorrect submission until the submission with a full solution is 10 minutes. After the end of the contest, you will have 12 hours to hack any solution you want. You will have access to copy any solution and test it locally.

You will be given 6-7 problems and 2 hours to solve them.

The problems were invented and prepared by Adilbek adedalic Dalabaev, Ivan BledDest Androsov, Maksim Neon Mescheryakov, Roman Roms Glazov, Alex fcspartakm Frolov and me. Also, huge thanks to Mike MikeMirzayanov Mirzayanov for great systems Polygon and Codeforces.

Good luck to all the participants!

Our friends at Neapolis University Pafos also have a message for you:

CSAI: First admission deadline approaches — April 28, 2026.

Apply for the BSc in Computer Science & Artificial Intelligence at the Neapolis University Pafos. Up to 40 full scholarships, provided by the JetBrains Foundation, are available this year.

Key Dates
  • Application Deadline: April 28, 2026, 11:59 pm UTC
  • Mandatory Entrance Test: May 3, 2026
A great opportunity: ACTS 2026.2 Camp

To improve skills and prepare for intense programs like CSAI, we encourage applying for the ACTS 2026.2 Camp in Germany (July 10-20, 2026).

  • Tracks: Competitive Programming and Software Engineering.
  • Registration Deadline: April 18th.

Ready to advance your coding journey? Join a leading computer science community today! Apply now and visit our dedicated pages for more details on how you can get involved.

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By awoo, history, 2 months ago, translation, In English

2203A - Towers of Boxes

Idea: BledDest

Tutorial
Solution (BledDest)

2203B - Beautiful Numbers

Idea: BledDest

Tutorial
Solution (Neon)

2203C - Test Generator

Idea: FelixArg

Tutorial
Solution (FelixArg)

2203D - Divisibility Game

Idea: FelixArg

Tutorial
Solution (FelixArg)

2203E - Probabilistic Card Game

Idea: BledDest

Tutorial
Solution 1 (awoo)
Solution 2 (awoo)

2203F - Binary Search with One Swap

Idea: BledDest

Tutorial
Solution (BledDest)

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By awoo, history, 2 months ago, translation, In English

Neapolis University Pafos

Hello Codeforces!

The series of Educational Rounds continues thanks to the support of the Computer Science and Artificial Intelligence (CSAI) program at Neapolis University Pafos, with scholarships provided by JetBrains.

Educational Codeforces Round 187 (Rated for Div. 2) will start on Feb/25/2026 17:35 (Moscow time).

This round will be rated for the participants with rating lower than 2100. It will be held on extended ICPC rules. The penalty for each incorrect submission until the submission with a full solution is 10 minutes. After the end of the contest, you will have 12 hours to hack any solution you want. You will have access to copy any solution and test it locally.

You will be given 6-7 problems and 2 hours to solve them.

The problems were invented and prepared by Adilbek adedalic Dalabaev, Ivan BledDest Androsov, Maksim Neon Mescheryakov, Roman Roms Glazov, Maks FelixArg Novotochinov and me. Also, huge thanks to Mike MikeMirzayanov Mirzayanov for great systems Polygon and Codeforces.

Good luck to all the participants!

Our friends at Neapolis University Pafos also have a message for you:

Admission is now open for the BSc in Computer Science & Artificial Intelligence. Up to 40 full scholarships from the JetBrains Foundation will be awarded this year, covering tuition, accommodation, insurance, visa fees, and a €300 monthly stipend.

JetBrains Blackbox Cup 2026 Join our new unique coding competition, happening on March 15, 2026.

  • Imagine joining a project with no documentation and no backlog. Your mission: explore the system, uncover hidden logic, and start solving tasks — step by step, through experimentation and smart guesses.
  • AI tools are welcome! AI assistants and modern developer tools are fully allowed — resourcefulness is part of the challenge.
  • Two leagues: Junior — high school students & Senior — university students, graduates, and professionals.

Registration closes on March 13.

Winning the Blackbox Cup can also boost the chances of getting a fully-funded JetBrains Foundation scholarship for BSc CSAI at Neapolis University Pafos(extra points on the entrance test).

See you!

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By awoo, history, 4 months ago, translation, In English

2182A - New Year String

Idea: BledDest

Tutorial
Solution (BledDest)

2182B - New Year Cake

Idea: BledDest

Tutorial
Solution (BledDest)

2182C - Production of Snowmen

Idea: Roms

Tutorial
Solution (BledDest)

2182D - Christmas Tree Decoration

Idea: BledDest

Tutorial
Solution (Neon)

2182E - New Year's Gifts

Idea: BledDest

Tutorial
Solution (Neon)

2182F1 - Christmas Reindeer (easy version)

2182F2 - Christmas Reindeer (hard version)

Idea: Roms

Tutorial
Solution (BledDest)

2182G - Short Garland

Idea: BledDest

Tutorial
Solution (awoo)

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By awoo, history, 4 months ago, translation, In English

Neapolis University Pafos

Hello Codeforces!

The series of Educational Rounds continues thanks to the support of the Computer Science and Artificial Intelligence (CSAI) program at Neapolis University Pafos, with scholarships provided by JetBrains.

Educational Codeforces Round 186 (Rated for Div. 2) will start on Dec/29/2025 17:35 (Moscow time).

This round will be rated for the participants with rating lower than 2100. It will be held on extended ICPC rules. The penalty for each incorrect submission until the submission with a full solution is 10 minutes. After the end of the contest, you will have 12 hours to hack any solution you want. You will have access to copy any solution and test it locally.

You will be given 6-7 problems and 2 hours to solve them.

The problems were invented and prepared by Adilbek adedalic Dalabaev, Ivan BledDest Androsov, Maksim Neon Mescheryakov, Roman Roms Glazov and me. Also, huge thanks to Mike MikeMirzayanov Mirzayanov for great systems Polygon and Codeforces.

Big thanks to the testers FelixArg and KIRIJIJI for their valuable advice and suggestions!

Good luck to all the participants!

And on the occasion of the New Year — Happy New Year!

We wish you clear ideas, strong solutions, and many ACs in the year ahead.

UPD: Editorial is out

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By awoo, history, 5 months ago, translation, In English

2170A - Maximum Neighborhood

Idea: BledDest

Tutorial
Solution 1 (Neon)
Solution 2 (Neon)

2170B - Addition on a Segment

Idea: FelixArg

Tutorial
Solution (FelixArg)

2170C - Quotient and Remainder

Idea: BledDest

Tutorial
Solution (adedalic)

2170D - Almost Roman

Idea: BledDest

Tutorial
Solution (BledDest)

2170E - Binary Strings and Blocks

Idea: Roms

Tutorial
Solution (BledDest)

2170F - Build XOR on a Segment

Idea: BledDest

Tutorial
Solution (BledDest)

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By awoo, history, 5 months ago, translation, In English

Neapolis University Pafos

Hello Codeforces!

The series of Educational Rounds continues thanks to the support of the Neapolis University Pafos.

On Nov/28/2025 17:35 (Moscow time) Educational Codeforces Round 185 (Rated for Div. 2) will start.

This round will be rated for the participants with rating lower than 2100. It will be held on extended ICPC rules. The penalty for each incorrect submission until the submission with a full solution is 10 minutes. After the end of the contest, you will have 12 hours to hack any solution you want. You will have access to copy any solution and test it locally.

You will be given 6 or 7 problems and 2 hours to solve them.

The problems were invented and prepared by Adilbek adedalic Dalabaev, Ivan BledDest Androsov, Maksim Neon Mescheryakov, Roman Roms Glazov, Maksim FelixArg Novotochinov and me. Also, huge thanks to Mike MikeMirzayanov Mirzayanov for great systems Polygon and Codeforces.

Good luck to all the participants!

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By awoo, history, 5 months ago, translation, In English

2169A - Alice and Bob

Idea: Roms

Tutorial
Solution (Roms)

2169B - Drifting Away

Idea: BledDest

Tutorial
Solution (awoo)

2169C - Range Operation

Idea: BledDest

Tutorial
Solution (Neon)

2169D1 - Removal of a Sequence (Easy Version)

Idea: FelixArg

Tutorial
Solution (FelixArg)

2169D2 - Removal of a Sequence (Hard Version)

Idea: FelixArg

Tutorial
Solution (FelixArg)

2169E - Points Selection

Idea: BledDest

Tutorial
Solution (BledDest)

2169F - Subsequence Problem

Idea: BledDest

Tutorial
Solution (BledDest)

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By awoo, history, 5 months ago, translation, In English

Neapolis University Pafos

Hello Codeforces!

The series of Educational Rounds continues thanks to the support of the Neapolis University Pafos.

On Nov/14/2025 17:35 (Moscow time) Educational Codeforces Round 184 (Rated for Div. 2) will start.

This round will be rated for the participants with rating lower than 2100. It will be held on extended ICPC rules. The penalty for each incorrect submission until the submission with a full solution is 10 minutes. After the end of the contest, you will have 12 hours to hack any solution you want. You will have access to copy any solution and test it locally.

You will be given 6 or 7 problems and 2 hours to solve them.

The problems were invented and prepared by Adilbek adedalic Dalabaev, Ivan BledDest Androsov, Maksim Neon Mescheryakov, Roman Roms Glazov, Maksim FelixArg Novotochinov and me. Also, huge thanks to Mike MikeMirzayanov Mirzayanov for great systems Polygon and Codeforces.

Good luck to all the participants!

UPD: Editorial is out

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By awoo, history, 7 months ago, translation, In English

2145A - Candies for Nephews

Idea: fcspartakm

Tutorial
Solution (fcspartakm)

2145B - Deck of Cards

Idea: BledDest

Tutorial
Solution (Neon)

2145C - Monocarp's String

Idea: fcspartakm

Tutorial
Solution (BledDest)

2145D - Inversion Value of a Permutation

Idea: BledDest

Tutorial
Solution (BledDest)

2145E - Predicting Popularity

Idea: adedalic

Tutorial
Solution (adedalic)

2145F - Long Journey

Idea: BledDest

Tutorial
Solution (Neon)

2145G - Cost of Coloring

Idea: BledDest

Tutorial
Solution (BledDest)

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By awoo, history, 7 months ago, translation, In English

2144A - Cut the Array

Idea: BledDest

Tutorial
Solution (BledDest)

2144B - Maximum Cost Permutation

Idea: BledDest

Tutorial
Solution (BledDest)

2144C - Non-Descending Arrays

Idea: BledDest

Tutorial
Solution (Neon)

2144D - Price Tags

Idea: BledDest

Tutorial
Solution (adedalic)

2144E1 - Looking at Towers (easy version)

Idea: Roms

Tutorial

2144E2 - Looking at Towers (difficult version)

Idea: Roms

Tutorial
Solution (BledDest)

2144F - Bracket Groups

Idea: BledDest

Tutorial
Solution 1 (awoo)
Solution 2 (awoo)

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By awoo, history, 7 months ago, translation, In English

Neapolis University Pafos

Hello Codeforces!

The series of Educational Rounds continues thanks to the support of the Neapolis University Pafos. They offer a BSc in Computer Science and AI with JetBrains Scholarships. Gain cutting-edge skills in AI and machine learning, preparing you for high-demand tech careers. Limited scholarships available — don't miss your chance to study in Europe for free!

On Sep/15/2025 17:35 (Moscow time) Educational Codeforces Round 182 (Rated for Div. 2) will start.

This round will be rated for the participants with rating lower than 2100. It will be held on extended ICPC rules. The penalty for each incorrect submission until the submission with a full solution is 10 minutes. After the end of the contest, you will have 12 hours to hack any solution you want. You will have access to copy any solution and test it locally.

You will be given 6 or 7 problems and 2 hours to solve them.

The problems were invented and prepared by Adilbek adedalic Dalabaev, Ivan BledDest Androsov, Maksim Neon Mescheryakov, Roman Roms Glazov and me. Also, huge thanks to Mike MikeMirzayanov Mirzayanov for great systems Polygon and Codeforces.

Good luck to all the participants!

Our friends at Neapolis University Pafos also have a message for you:

🚀 Free Math, AI, and Coding Clubs
Neapolis University Pafos, in collaboration with JetBrains, invites school students (ages 13–19) to join the Math, AI, and Coding Clubs — weekly programmes designed to build your problem-solving skills through curated challenges and live sessions.

Don't miss the chance to sharpen your skills (and enjoy some fun mashup contests, curated by pashka).

🔹 Math Club
Build a strong mathematical foundation to improve your programming skills. You’ll receive 10–15 progressively challenging problems each week, along with a 90-minute live session every Saturday. Two difficulty levels are available, so you can choose the path that suits you best.
💡 Top performers will be awarded 5 bonus points on the entrance test for the BSc in Computer Science and Artificial Intelligence at Neapolis University Pafos — a fully funded programme supported by JetBrains Foundation Scholarships.
👉Join the Math Club

🔹 AI Club
Explore the world of Artificial Intelligence — from beginner concepts to olympiad-level topics (e.g. IOAI). Attend live sessions every Wednesday and complete weekly homework assignments to keep progressing.
👉Join the AI Club

🔹 Coding Club
Ideal for students with some experience in competitive programming who want to take their skills further. Each week features a mashup of problems from past Codeforces contests, curated by Pavel Mavrin (2004 ICPC World Champion, 2002 IOI Silver Medalist, and JetBrains Academy instructor).
👉Join the Coding Club

🎯 Show off your skills:
Take part in the third edition of the JetBrains Youth Coding Challenge — open to school students aged 13–19. Top participants will be invited to the fourth Algorithm and Code Training Camp (ACTS) 2026.1 in Romania or to ACTS Online in January 2026.

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By awoo, history, 9 months ago, translation, In English

2125A - Difficult Contest

Idea: FelixArg

Tutorial
Solution (awoo)

2125B - Left and Down

Idea: BledDest

Tutorial
Solution (ifive)

2125C - Count Good Numbers

Idea: BledDest

Tutorial
Solution 1 (BledDest)
Solution 2 (awoo)

2125D - Segments Covering

Idea: BledDest

Tutorial
Solution 1 (Neon)
Solution 2 (Neon)

2125E - Sets of Complementary Sums

Idea: FelixArg

Tutorial
Solution (FelixArg)

2125F - Timofey and Docker

Idea: FelixArg

Tutorial
Solution (awoo)

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By awoo, history, 9 months ago, translation, In English

Neapolis University Pafos

Hello Codeforces!

The series of Educational Rounds continues thanks to the support of the Neapolis University Pafos. They offer a BSc in Computer Science and AI with JetBrains Scholarships. Gain cutting-edge skills in AI and machine learning, preparing you for high-demand tech careers. Limited scholarships available — don't miss your chance to study in Europe for free!

On Jul/22/2025 17:35 (Moscow time) Educational Codeforces Round 181 (Rated for Div. 2) will start.

This round will be rated for the participants with rating lower than 2100. It will be held on extended ICPC rules. The penalty for each incorrect submission until the submission with a full solution is 10 minutes. After the end of the contest, you will have 12 hours to hack any solution you want. You will have access to copy any solution and test it locally.

You will be given 6 or 7 problems and 2 hours to solve them.

The problems were invented and prepared by Adilbek adedalic Dalabaev, Ivan BledDest Androsov, Maksim Neon Mescheryakov, Maksim FelixArg Novotochinov, Polina ifive Piklyaeva and me. Also, huge thanks to Mike MikeMirzayanov Mirzayanov for great systems Polygon and Codeforces.

Big thanks to the testers shnirelman and Brovko for their valuable advice and suggestions!

Good luck to all the participants!

UPD: Editorial is out

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By awoo, history, 10 months ago, translation, In English

Neapolis University Pafos

Hello Codeforces!

The series of Educational Rounds continues thanks to the support of the Neapolis University Pafos. They offer a BSc in Computer Science and AI with JetBrains Scholarships. Gain cutting-edge skills in AI and machine learning, preparing you for high-demand tech careers. Curious? Check out the CSAI curriculum. Limited scholarships available — don't miss your chance to study in Europe for free!

On Jun/23/2025 17:35 (Moscow time) Educational Codeforces Round 180 (Rated for Div. 2) will start.

This round will be rated for the participants with rating lower than 2100. It will be held on extended ICPC rules. The penalty for each incorrect submission until the submission with a full solution is 10 minutes. After the end of the contest, you will have 12 hours to hack any solution you want. You will have access to copy any solution and test it locally.

You will be given 6 or 7 problems and 2 hours to solve them.

The problems were invented and prepared by Adilbek adedalic Dalabaev, 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!

UPD: Editorial is out

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By awoo, history, 12 months ago, translation, In English

2104A - Three Decks

Idea: fcspartakm

Tutorial
Solution (awoo)

2104B - Move to the End

Idea: BledDest

Tutorial
Solution (BledDest)

2104C - Card Game

Idea: BledDest

Tutorial
Solution (BledDest)

2104D - Array and GCD

Idea: BledDest

Tutorial
Solution (Neon)

2104E - Unpleasant Strings

Idea: adedalic

Tutorial
Solution (adedalic)

2104F - Numbers and Strings

Idea: BledDest

Tutorial
Solution (BledDest)

2104G - Modulo 3

Idea: BledDest

Tutorial
Solution (Neon)

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By awoo, history, 13 months ago, translation, In English

2075A - To Zero

Idea: BledDest

Tutorial
Solution (BledDest)

2075B - Array Recoloring

Idea: BledDest

Tutorial
Solution (Neon)

2075C - Two Colors

Idea: fcspartakm

Tutorial
Solution (awoo)

2075D - Equalization

Idea: BledDest

Tutorial
Solution (Neon)

2075E - XOR Matrix

Idea: BledDest

Tutorial
Solution (BledDest)

2075F - Beautiful Sequence Returns

Idea: adedalic

Tutorial
Solution (adedalic)

Full text and comments »

  • Vote: I like it
  • +35
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By awoo, history, 13 months ago, translation, In English

Neapolis University Pafos

Hello Codeforces!

The series of Educational Rounds continues thanks to the support of the Neapolis University Pafos.

On Mar/17/2025 17:35 (Moscow time) Educational Codeforces Round 176 (Rated for Div. 2) will start.

This round will be rated for the participants with rating lower than 2100. It will be held on extended ICPC rules. The penalty for each incorrect submission until the submission with a full solution is 10 minutes. After the end of the contest, you will have 12 hours to hack any solution you want. You will have access to copy any solution and test it locally.

You will be given 6 or 7 problems and 2 hours to solve them.

The problems were invented and prepared by Adilbek adedalic Dalabaev, Ivan BledDest Androsov, Maksim Neon Mescheryakov, Alex fcspartakm Frolov and me. Also, huge thanks to Mike MikeMirzayanov Mirzayanov for great systems Polygon and Codeforces.

Good luck to all the participants!

Our friends at Neapolis University Pafos also have a message for you:

Admission to the Computer Science and Artificial Intelligence bachelor's program at Neapolis University Pafos is open!

The JetBrains Foundation supports this bachelor's program and offers 15 fully funded scholarships for the most talented applicants. The scholarships cover tuition, accommodation, medical insurance, visa fees, and pocket money (€300 per month).

Learn more here →

First admission round:

  • Application deadline – April 23, 2025
  • Entrance test – April 27, 2025

UPD: Editorial is out

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By awoo, history, 14 months ago, translation, In English

2070A - FizzBuzz Remixed

Idea: BledDest

Tutorial
Solution (BledDest)

2070B - Robot Program

Idea: BledDest

Tutorial
Solution (Neon)

2070C - Limited Repainting

Idea: BledDest

Tutorial
Solution (awoo)

2070D - Tree Jumps

Idea: BledDest

Tutorial
Solution (Neon)

2070E - Game with Binary String

Idea: BledDest

Tutorial
Solution (BledDest)

2070F - Friends and Pizza

Idea: BledDest

Tutorial
Solution (BledDest)

Full text and comments »

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By awoo, history, 14 months ago, translation, In English

Neapolis University Pafos

Hello Codeforces!

The series of Educational Rounds continues thanks to the support of the Neapolis University Pafos.

On Feb/27/2025 17:35 (Moscow time) Educational Codeforces Round 175 (Rated for Div. 2) will start.

This round will be rated for the participants with rating lower than 2100. It will be held on extended ICPC rules. The penalty for each incorrect submission until the submission with a full solution is 10 minutes. After the end of the contest, you will have 12 hours to hack any solution you want. You will have access to copy any solution and test it locally.

You will be given 6 or 7 problems and 2 hours to solve them.

The problems were invented and prepared by Adilbek adedalic Dalabaev, Ivan BledDest Androsov, Maksim Neon Mescheryakov and me. Also, huge thanks to Mike MikeMirzayanov Mirzayanov for great systems Polygon and Codeforces.

Big thanks to the tester shnirelman for his valuable advice and suggestions!

Good luck to all the participants!

Our friends at Neapolis University Pafos also have a message for you:

Admission to the Computer Science and Artificial Intelligence bachelor's program at Neapolis University Pafos is open!

The JetBrains Foundation supports this bachelor's program and offers 15 fully funded scholarships for the most talented applicants. The scholarships cover tuition, accommodation, medical insurance, visa fees, and pocket money (€300 per month).

Learn more here →

First admission round:

  • Application deadline – April 23, 2025
  • Entrance test – April 27, 2025

UPD: Editorial is out

Full text and comments »

  • Vote: I like it
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By awoo, history, 14 months ago, translation, In English

Neapolis University Pafos

Hello Codeforces!

The series of Educational Rounds continues thanks to the support of the Neapolis University Pafos. They offer a BSc in Computer Science and AI with JetBrains Scholarships. Gain cutting-edge skills in AI and machine learning, preparing you for high-demand tech careers. Curious? Check out the CSAI curriculum now. Limited scholarships available — don't miss your chance to study in Europe for free!

On Feb/18/2025 17:35 (Moscow time) Educational Codeforces Round 174 (Rated for Div. 2) will start.

This round will be rated for the participants with rating lower than 2100. It will be held on extended ICPC rules. The penalty for each incorrect submission until the submission with a full solution is 10 minutes. After the end of the contest, you will have 12 hours to hack any solution you want. You will have access to copy any solution and test it locally.

You will be given 6 or 7 problems and 2 hours to solve them.

The problems were invented and prepared by Adilbek adedalic Dalabaev, 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!

UPD: Editorial is out

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By awoo, history, 16 months ago, translation, In English

2043A - Coin Transformation

Idea: BledDest

Tutorial
Solution (BledDest)

2043B - Digits

Idea: AcidWrongGod

Tutorial
Solution (BledDest)

2043C - Sums on Segments

Idea: Ferume

Tutorial
Solution (awoo)

2043D - Problem about GCD

Idea: Ferume

Tutorial
Solution (BledDest)

2043E - Matrix Transformation

Idea: Ferume

Tutorial
Solution (BledDest)

2043F - Nim

Idea: Ferume

Tutorial
Solution (awoo)

2043G - Problem with Queries

Idea: Ferume

Tutorial

Full text and comments »

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By awoo, history, 17 months ago, translation, In English

Neapolis University Pafos

Hello Codeforces!

The series of Educational Rounds continues thanks to the support of the Neapolis University Pafos. They offer a BSc in Computer Science and AI with JetBrains Scholarships. Gain cutting-edge skills in AI and machine learning, preparing you for high-demand tech careers. Curious? Check out the CSAI curriculum now. Limited scholarships available — don't miss your chance to study in Europe for free!

On Dec/02/2024 17:35 (Moscow time) Educational Codeforces Round 172 (Rated for Div. 2) will start.

This round will be rated for the participants with rating lower than 2100. It will be held on extended ICPC rules. The penalty for each incorrect submission until the submission with a full solution is 10 minutes. After the end of the contest, you will have 12 hours to hack any solution you want. You will have access to copy any solution and test it locally.

You will be given 6 or 7 problems and 2 hours to solve them.

The problems were invented and prepared by Adilbek adedalic Dalabaev, 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!

UPD: Editorial is out

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By awoo, history, 18 months ago, translation, In English

2026A - Perpendicular Segments

Idea: adedalic

Tutorial
Solution (adedalic)

2026B - Black Cells

Idea: BledDest

Tutorial
Solution (Neon)

2026C - Action Figures

Idea: BledDest

Tutorial
Solution (BledDest)

2026D - Sums of Segments

Idea: shnirelman

Tutorial
Solution (BledDest)

2026E - Best Subsequence

Idea: BledDest

Tutorial
Solution (Neon)

2026F - Bermart Ice Cream

Idea: BledDest

Tutorial
Solution (awoo)

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