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Over 20,000 problems available: AMC 8/10/12 and AIME problems from 2010-2024; USAJMO/USAMO problems from 2002-2024; USACO problems from 2014 to 2024 (all divisions); all Codeforces, AtCoder and DMOJ problems. If you leave the search field blank, it returns all problems with the specified type.

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  • AMC 8: [year] AMC 8 Problem #, Ex: 2013 AMC 8 Problem 1
  • AMC 10: [year] AMC 10A Problem # OR [year] AMC 10B Problem #, Ex: 2015 AMC 10A Problem 16
  • AMC 12: [year] AMC 12A Problem # OR [year] AMC 12B Problem #, Ex: 2021 AMC 12B Problem 25
  • AIME: [year] AIME I Problem # OR [year] AIME II Problem #, Ex: 2013 AIME I Problem 8
  • USAJMO/USAMO: [year] USAJMO/USAMO Problem #, Ex: 2023 USAJMO Problem 1
  • Codeforces: Codeforces [contest id (e.g. 101)][problem id (e.g. A, B, C)]: [Codeforces problem name], Ex: Codeforces 1336F: Journey
  • AtCoder: AtCoder [contest id (e.g. ABC314, ARC164, ZONE2021)]: [problem id (A, B, C)]. [Problem name], Ex: AtCoder ZONE2021: E. Sneaking
  • DMOJ: DMOJ [contest name (if applicable)] [problem number (e.g. P1)] - [Problem name], Ex: DMOJ Yet Another Contest 3 P1 - Shell Swap Scam
  • USACO: [year] [contest month (e.g. January, US Open)], [division (e.g. Gold)]: [Problem name], Ex: USACO 2023 US Open Contest, Bronze: Rotate and Shift

ID Problem Name (click to add insights/hints, view summary of insights/hints and similar problems)
4550 Codeforces 1056H: Detect Robots
4549 Codeforces 1056G: Take Metro
4548 Codeforces 1056F: Write The Contest
4547 Codeforces 1056E: Check Transcription
4546 Codeforces 1056D: Decorate Apple Tree
4545 Codeforces 1056C: Pick Heroes
4544 Codeforces 1056B: Divide Candies
4543 Codeforces 1056A: Determine Line
4542 Codeforces 1055G: Jellyfish Nightmare
4541 Codeforces 1055F: Tree and XOR
4540 Codeforces 1055E: Segments on the Line
4539 Codeforces 1055D: Refactoring
4538 Codeforces 1055C: Lucky Days
4537 Codeforces 1055B: Alice and Hairdresser
4536 Codeforces 1055A: Metro
4535 Codeforces 1054H: Epic Convolution
4534 Codeforces 1054G: New Road Network
4533 Codeforces 1054F: Electric Scheme
4532 Codeforces 1054E: Chips Puzzle
4531 Codeforces 1054D: Changing Array
4530 Codeforces 1054C: Candies Distribution
4529 Codeforces 1054B: Appending Mex
4528 Codeforces 1054A: Elevator or Stairs?
4527 Codeforces 1053E: Euler tour
4526 Codeforces 1051G: Distinctification
4525 Codeforces 1051F: The Shortest Statement
4524 Codeforces 1051E: Vasya and Big Integers
4523 Codeforces 1051D: Bicolorings
4522 Codeforces 1051C: Vasya and Multisets
4521 Codeforces 1051B: Relatively Prime Pairs
4520 Codeforces 1051A: Vasya And Password
4519 Codeforces 1047B: Cover Points
4518 Codeforces 1047A: Little C Loves 3 I
4517 Codeforces 1046I: Say Hello
4516 Codeforces 1046F: Splitting money
4515 Codeforces 1046C: Space Formula
4514 Codeforces 1045J: Moonwalk challenge
4513 Codeforces 1045I: Palindrome Pairs
4512 Codeforces 1045H: Self-exploration
4511 Codeforces 1045G: AI robots
4510 Codeforces 1045F: Shady Lady
4509 Codeforces 1045E: Ancient civilizations
4508 Codeforces 1045D: Interstellar battle
4507 Codeforces 1045C: Hyperspace Highways
4506 Codeforces 1045B: Space Isaac
4505 Codeforces 1045A: Last chance
4504 Codeforces 1044F: DFS
4503 Codeforces 1044E: Grid Sort
4502 Codeforces 1044D: Deduction Queries
4501 Codeforces 1044C: Optimal Polygon Perimeter
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