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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)
7150 Codeforces 1560F1: Nearest Beautiful Number (easy version)
7149 Codeforces 1560E: Polycarp and String Transformation
7148 Codeforces 1560D: Make a Power of Two
7147 Codeforces 1560C: Infinity Table
7146 Codeforces 1560B: Who's Opposite?
7145 Codeforces 1560A: Dislike of Threes
7144 Codeforces 1559E: Mocha and Stars
7143 Codeforces 1559D2: Mocha and Diana (Hard Version)
7142 Codeforces 1559D1: Mocha and Diana (Easy Version)
7141 Codeforces 1559C: Mocha and Hiking
7140 Codeforces 1559B: Mocha and Red and Blue
7139 Codeforces 1559A: Mocha and Math
7138 Codeforces 1558F: Strange Sort
7137 Codeforces 1558E: Down Below
7136 Codeforces 1558D: Top-Notch Insertions
7135 Codeforces 1558C: Bottom-Tier Reversals
7134 Codeforces 1558B: Up the Strip
7133 Codeforces 1558A: Charmed by the Game
7132 Codeforces 1557E: Assiut Chess
7131 Codeforces 1557D: Ezzat and Grid
7130 Codeforces 1557C: Moamen and XOR
7129 Codeforces 1557B: Moamen and k-subarrays
7128 Codeforces 1557A: Ezzat and Two Subsequences
7127 Codeforces 1556H: DIY Tree
7126 Codeforces 1556G: Gates to Another World
7125 Codeforces 1556F: Sports Betting
7124 Codeforces 1556E: Equilibrium
7123 Codeforces 1556D: Take a Guess
7122 Codeforces 1556C: Compressed Bracket Sequence
7121 Codeforces 1556B: Take Your Places!
7120 Codeforces 1556A: A Variety of Operations
7119 Codeforces 1555F: Good Graph
7118 Codeforces 1555E: Boring Segments
7117 Codeforces 1555D: Say No to Palindromes
7116 Codeforces 1555C: Coin Rows
7115 Codeforces 1555B: Two Tables
7114 Codeforces 1555A: PizzaForces
7113 Codeforces 1554E: You
7112 Codeforces 1554D: Diane
7111 Codeforces 1554C: Mikasa
7110 Codeforces 1554B: Cobb
7109 Codeforces 1554A: Cherry
7108 Codeforces 1553I: Stairs
7107 Codeforces 1553H: XOR and Distance
7106 Codeforces 1553G: Common Divisor Graph
7105 Codeforces 1553F: Pairwise Modulo
7104 Codeforces 1553E: Permutation Shift
7103 Codeforces 1553D: Backspace
7102 Codeforces 1553C: Penalty
7101 Codeforces 1553B: Reverse String
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