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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)
7500 Codeforces 1628A: Meximum Array
7499 Codeforces 1627F: Not Splitting
7498 Codeforces 1627E: Not Escaping
7497 Codeforces 1627D: Not Adding
7496 Codeforces 1627C: Not Assigning
7495 Codeforces 1627B: Not Sitting
7494 Codeforces 1627A: Not Shading
7493 Codeforces 1626F: A Random Code Problem
7492 Codeforces 1626E: Black and White Tree
7491 Codeforces 1626D: Martial Arts Tournament
7490 Codeforces 1626C: Monsters And Spells
7489 Codeforces 1626B: Minor Reduction
7488 Codeforces 1626A: Equidistant Letters
7487 Codeforces 1625E2: Cats on the Upgrade (hard version)
7486 Codeforces 1625E1: Cats on the Upgrade (easy version)
7485 Codeforces 1625D: Binary Spiders
7484 Codeforces 1625C: Road Optimization
7483 Codeforces 1625B: Elementary Particles
7482 Codeforces 1625A: Ancient Civilization
7481 Codeforces 1624G: MinOr Tree
7480 Codeforces 1624F: Interacdive Problem
7479 Codeforces 1624E: Masha-forgetful
7478 Codeforces 1624D: Palindromes Coloring
7477 Codeforces 1624C: Division by Two and Permutation
7476 Codeforces 1624B: Make AP
7475 Codeforces 1624A: Plus One on the Subset
7474 Codeforces 1623E: Middle Duplication
7473 Codeforces 1623D: Robot Cleaner Revisit
7472 Codeforces 1623C: Balanced Stone Heaps
7471 Codeforces 1623B: Game on Ranges
7470 Codeforces 1623A: Robot Cleaner
7469 Codeforces 1622F: Quadratic Set
7468 Codeforces 1622E: Math Test
7467 Codeforces 1622D: Shuffle
7466 Codeforces 1622C: Set or Decrease
7465 Codeforces 1622B: Berland Music
7464 Codeforces 1622A: Construct a Rectangle
7463 Codeforces 1621I: Two Sequences
7462 Codeforces 1621H: Trains and Airplanes
7461 Codeforces 1621G: Weighted Increasing Subsequences
7460 Codeforces 1621F: Strange Instructions
7459 Codeforces 1621E: New School
7458 Codeforces 1621D: The Winter Hike
7457 Codeforces 1621C: Hidden Permutations
7456 Codeforces 1621B: Integers Shop
7455 Codeforces 1621A: Stable Arrangement of Rooks
7454 Codeforces 1620G: Subsequences Galore
7453 Codeforces 1620F: Bipartite Array
7452 Codeforces 1620E: Replace the Numbers
7451 Codeforces 1620D: Exact Change
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