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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)
7300 Codeforces 1594D: The Number of Imposters
7299 Codeforces 1594C: Make Them Equal
7298 Codeforces 1594B: Special Numbers
7297 Codeforces 1594A: Consecutive Sum Riddle
7296 Codeforces 1593G: Changing Brackets
7295 Codeforces 1593F: Red-Black Number
7294 Codeforces 1593E: Gardener and Tree
7293 Codeforces 1593D2: Half of Same
7292 Codeforces 1593D1: All are Same
7291 Codeforces 1593C: Save More Mice
7290 Codeforces 1593B: Make it Divisible by 25
7289 Codeforces 1593A: Elections
7288 Codeforces 1592F2: Alice and Recoloring 2
7287 Codeforces 1592F1: Alice and Recoloring 1
7286 Codeforces 1592E: Bored Bakry
7285 Codeforces 1592D: Hemose in ICPC ?
7284 Codeforces 1592C: Bakry and Partitioning
7283 Codeforces 1592B: Hemose Shopping
7282 Codeforces 1592A: Gamer Hemose
7281 Codeforces 1588F: Jumping Through the Array
7280 Codeforces 1586I: Omkar and Mosaic
7279 Codeforces 1585G: Poachers
7278 Codeforces 1585F: Non-equal Neighbours
7277 Codeforces 1585E: Frequency Queries
7276 Codeforces 1585D: Yet Another Sorting Problem
7275 Codeforces 1585C: Minimize Distance
7274 Codeforces 1585B: Array Eversion
7273 Codeforces 1585A: Life of a Flower
7272 Codeforces 1584G: Eligible Segments
7271 Codeforces 1584F: Strange LCS
7270 Codeforces 1584E: Game with Stones
7269 Codeforces 1584D: Guess the Permutation
7268 Codeforces 1584C: Two Arrays
7267 Codeforces 1584B: Coloring Rectangles
7266 Codeforces 1584A: Mathematical Addition
7265 Codeforces 1583H: Omkar and Tours
7264 Codeforces 1583G: Omkar and Time Travel
7263 Codeforces 1583F: Defender of Childhood Dreams
7262 Codeforces 1583E: Moment of Bloom
7261 Codeforces 1583D: Omkar and the Meaning of Life
7260 Codeforces 1583C: Omkar and Determination
7259 Codeforces 1583B: Omkar and Heavenly Tree
7258 Codeforces 1583A: Windblume Ode
7257 Codeforces 1582G: Kuzya and Homework
7256 Codeforces 1582F2: Korney Korneevich and XOR (hard version)
7255 Codeforces 1582F1: Korney Korneevich and XOR (easy version)
7254 Codeforces 1582E: Pchelyonok and Segments
7253 Codeforces 1582D: Vupsen, Pupsen and 0
7252 Codeforces 1582C: Grandma Capa Knits a Scarf
7251 Codeforces 1582B: Luntik and Subsequences
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