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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)
500 Codeforces 100E: Lamps in a Line
499 Codeforces 100D: World of Mouth
498 Codeforces 100C: A+B
497 Codeforces 100B: Friendly Numbers
496 Codeforces 100A: Carpeting the Room
495 Codeforces 99B: Help Chef Gerasim
494 Codeforces 99A: Help Far Away Kingdom
493 Codeforces 98E: Help Shrek and Donkey
492 Codeforces 98D: Help Monks
491 Codeforces 98C: Help Greg the Dwarf
490 Codeforces 98B: Help King
489 Codeforces 98A: Help Victoria the Wise
488 Codeforces 97E: Leaders
487 Codeforces 97D: Robot in Basement
486 Codeforces 97C: Winning Strategy
485 Codeforces 97B: Superset
484 Codeforces 97A: Domino
483 Codeforces 96B: Lucky Numbers (easy)
482 Codeforces 96A: Football
481 Codeforces 95E: Lucky Country
480 Codeforces 95D: Horse Races
479 Codeforces 95C: Volleyball
478 Codeforces 95B: Lucky Numbers
477 Codeforces 95A: Hockey
476 Codeforces 94B: Friends
475 Codeforces 94A: Restoring Password
474 Codeforces 93E: Lostborn
473 Codeforces 93D: Flags
472 Codeforces 93C: Azembler
471 Codeforces 93B: End of Exams
470 Codeforces 93A: Frames
469 Codeforces 92B: Binary Number
468 Codeforces 92A: Chips
467 Codeforces 91E: Igloo Skyscraper
466 Codeforces 91D: Grocer's Problem
465 Codeforces 91C: Ski Base
464 Codeforces 91B: Queue
463 Codeforces 91A: Newspaper Headline
462 Codeforces 90B: African Crossword
461 Codeforces 90A: Cableway
460 Codeforces 89E: Fire and Ice
459 Codeforces 89D: Space mines
458 Codeforces 89C: Chip Play
457 Codeforces 89B: Widget Library
456 Codeforces 89A: Robbery
455 Codeforces 88B: Keyboard
454 Codeforces 88A: Chord
453 Codeforces 87E: Mogohu-Rea Idol
452 Codeforces 87D: Beautiful Road
451 Codeforces 87C: Interesting Game
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