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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)
7900 Codeforces 1701B: Permutation
7899 Codeforces 1701A: Grass Field
7898 Codeforces 1700F: Puzzle
7897 Codeforces 1700E: Serega the Pirate
7896 Codeforces 1700D: River Locks
7895 Codeforces 1700C: Helping the Nature
7894 Codeforces 1700B: Palindromic Numbers
7893 Codeforces 1700A: Optimal Path
7892 Codeforces 1699E: Three Days Grace
7891 Codeforces 1699D: Almost Triple Deletions
7890 Codeforces 1699C: The Third Problem
7889 Codeforces 1699B: Almost Ternary Matrix
7888 Codeforces 1699A: The Third Three Number Problem
7887 Codeforces 1698G: Long Binary String
7886 Codeforces 1698F: Equal Reversal
7885 Codeforces 1698E: PermutationForces II
7884 Codeforces 1698D: Fixed Point Guessing
7883 Codeforces 1698C: 3SUM Closure
7882 Codeforces 1698B: Rising Sand
7881 Codeforces 1698A: XOR Mixup
7880 Codeforces 1697F: Too Many Constraints
7879 Codeforces 1697E: Coloring
7878 Codeforces 1697D: Guess The String
7877 Codeforces 1697C: awoo's Favorite Problem
7876 Codeforces 1697B: Promo
7875 Codeforces 1697A: Parkway Walk
7874 Codeforces 1696H: Maximum Product?
7873 Codeforces 1696G: Fishingprince Plays With Array Again
7872 Codeforces 1696F: Tree Recovery
7871 Codeforces 1696E: Placing Jinas
7870 Codeforces 1696D: Permutation Graph
7869 Codeforces 1696C: Fishingprince Plays With Array
7868 Codeforces 1696B: NIT Destroys the Universe
7867 Codeforces 1696A: NIT orz!
7866 Codeforces 1695E: Ambiguous Dominoes
7865 Codeforces 1695D2: Tree Queries (Hard Version)
7864 Codeforces 1695D1: Tree Queries (Easy Version)
7863 Codeforces 1695C: Zero Path
7862 Codeforces 1695B: Circle Game
7861 Codeforces 1695A: Subrectangle Guess
7860 Codeforces 1694B: Paranoid String
7859 Codeforces 1694A: Creep
7858 Codeforces 1693F: I Might Be Wrong
7857 Codeforces 1693E: Outermost Maximums
7856 Codeforces 1693D: Decinc Dividing
7855 Codeforces 1693C: Keshi in Search of AmShZ
7854 Codeforces 1693B: Fake Plastic Trees
7853 Codeforces 1693A: Directional Increase
7852 Codeforces 1692H: Gambling
7851 Codeforces 1692G: 2^Sort
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