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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)
7000 Codeforces 1534H: Lost Nodes
6999 Codeforces 1534G: A New Beginning
6998 Codeforces 1534F2: Falling Sand (Hard Version)
6997 Codeforces 1534F1: Falling Sand (Easy Version)
6996 Codeforces 1534E: Lost Array
6995 Codeforces 1534D: Lost Tree
6994 Codeforces 1534C: Little Alawn's Puzzle
6993 Codeforces 1534B: Histogram Ugliness
6992 Codeforces 1534A: Colour the Flag
6991 Codeforces 1533J: Pawns
6990 Codeforces 1533I: Excursions
6989 Codeforces 1533H: Submatrices
6988 Codeforces 1533G: Biome Map
6987 Codeforces 1533F: Binary String Partition
6986 Codeforces 1533E: Chess Team Forming
6985 Codeforces 1533D: String Searching
6984 Codeforces 1533C: Sweets
6983 Codeforces 1533B: Nearest Point Function
6982 Codeforces 1533A: Travel to Bertown
6981 Codeforces 1532F: Prefixes and Suffixes
6980 Codeforces 1532E: Good Array
6979 Codeforces 1532D: Teams Forming
6978 Codeforces 1532C: Uniform String
6977 Codeforces 1532B: Frog Jumping
6976 Codeforces 1532A: A+B (Trial Problem)
6975 Codeforces 1531E3: Сортировка слиянием
6974 Codeforces 1531E2: Сортировка слиянием
6973 Codeforces 1531E1: Сортировка слиянием
6972 Codeforces 1531D: Редактируем Зингер | color
6971 Codeforces 1531C: Симметричный амфитеатр
6970 Codeforces 1531B2: Мониторинг
6969 Codeforces 1531B1: Мониторинг
6968 Codeforces 1531A: Зингер | color
6967 Codeforces 1530H: Turing's Award
6966 Codeforces 1530G: What a Reversal
6965 Codeforces 1530F: Bingo
6964 Codeforces 1530E: Minimax
6963 Codeforces 1530D: Secret Santa
6962 Codeforces 1530C: Pursuit
6961 Codeforces 1530B: Putting Plates
6960 Codeforces 1530A: Binary Decimal
6959 Codeforces 1529B: Sifid and Strange Subsequences
6958 Codeforces 1529A: Eshag Loves Big Arrays
6957 Codeforces 1528F: AmShZ Farm
6956 Codeforces 1528E: Mashtali and Hagh Trees
6955 Codeforces 1528D: It's a bird! No, it's a plane! No, it's AaParsa!
6954 Codeforces 1528C: Trees of Tranquillity
6953 Codeforces 1528B: Kavi on Pairing Duty
6952 Codeforces 1528A: Parsa's Humongous Tree
6951 Codeforces 1527E: Partition Game
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