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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)
4755 Codeforces 1097E: Egor and an RPG game
4754 Codeforces 1097D: Makoto and a Blackboard
4753 Codeforces 1097C: Yuhao and a Parenthesis
4752 Codeforces 1097B: Petr and a Combination Lock
4751 Codeforces 1097A: Gennady and a Card Game
4750 Codeforces 1096G: Lucky Tickets
4749 Codeforces 1096F: Inversion Expectation
4748 Codeforces 1096E: The Top Scorer
4747 Codeforces 1096D: Easy Problem
4746 Codeforces 1096C: Polygon for the Angle
4745 Codeforces 1096B: Substring Removal
4744 Codeforces 1096A: Find Divisible
4743 Codeforces 1095F: Make It Connected
4742 Codeforces 1095E: Almost Regular Bracket Sequence
4741 Codeforces 1095D: Circular Dance
4740 Codeforces 1095C: Powers Of Two
4739 Codeforces 1095B: Array Stabilization
4738 Codeforces 1095A: Repeating Cipher
4737 Codeforces 1093G: Multidimensional Queries
4736 Codeforces 1093F: Vasya and Array
4735 Codeforces 1093E: Intersection of Permutations
4734 Codeforces 1093D: Beautiful Graph
4733 Codeforces 1093C: Mishka and the Last Exam
4732 Codeforces 1093B: Letters Rearranging
4731 Codeforces 1093A: Dice Rolling
4730 Codeforces 1092F: Tree with Maximum Cost
4729 Codeforces 1092E: Minimal Diameter Forest
4728 Codeforces 1092D2: Great Vova Wall (Version 2)
4727 Codeforces 1092D1: Great Vova Wall (Version 1)
4726 Codeforces 1092C: Prefixes and Suffixes
4725 Codeforces 1092B: Teams Forming
4724 Codeforces 1092A: Uniform String
4723 Codeforces 1091H: New Year and the Tricolore Recreation
4722 Codeforces 1091G: New Year and the Factorisation Collaboration
4721 Codeforces 1091F: New Year and the Mallard Expedition
4720 Codeforces 1091E: New Year and the Acquaintance Estimation
4719 Codeforces 1091D: New Year and the Permutation Concatenation
4718 Codeforces 1091C: New Year and the Sphere Transmission
4717 Codeforces 1091B: New Year and the Treasure Geolocation
4716 Codeforces 1091A: New Year and the Christmas Ornament
4715 Codeforces 1090M: The Pleasant Walk
4714 Codeforces 1090L: Berland University
4713 Codeforces 1090K: Right Expansion Of The Mind
4712 Codeforces 1090J: Two Prefixes
4711 Codeforces 1090I: Minimal Product
4710 Codeforces 1090H: Linearization
4709 Codeforces 1090G: Combostone
4708 Codeforces 1090F: How to Learn You Score
4707 Codeforces 1090E: Horseback Riding
4706 Codeforces 1090D: Similar Arrays
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