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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)
3500 Codeforces 820A: Mister B and Book Reading
3499 Codeforces 819E: Mister B and Flight to the Moon
3498 Codeforces 819D: Mister B and Astronomers
3497 Codeforces 819C: Mister B and Beacons on Field
3496 Codeforces 819B: Mister B and PR Shifts
3495 Codeforces 819A: Mister B and Boring Game
3494 Codeforces 818G: Four Melodies
3493 Codeforces 818F: Level Generation
3492 Codeforces 818E: Card Game Again
3491 Codeforces 818D: Multicolored Cars
3490 Codeforces 818C: Sofa Thief
3489 Codeforces 818B: Permutation Game
3488 Codeforces 818A: Diplomas and Certificates
3487 Codeforces 817F: MEX Queries
3486 Codeforces 817E: Choosing The Commander
3485 Codeforces 817D: Imbalanced Array
3484 Codeforces 817C: Really Big Numbers
3483 Codeforces 817B: Makes And The Product
3482 Codeforces 817A: Treasure Hunt
3481 Codeforces 816B: Karen and Coffee
3480 Codeforces 816A: Karen and Morning
3479 Codeforces 815E: Karen and Neighborhood
3478 Codeforces 815D: Karen and Cards
3477 Codeforces 815C: Karen and Supermarket
3476 Codeforces 815B: Karen and Test
3475 Codeforces 815A: Karen and Game
3474 Codeforces 814E: An unavoidable detour for home
3473 Codeforces 814D: An overnight dance in discotheque
3472 Codeforces 814C: An impassioned circulation of affection
3471 Codeforces 814B: An express train to reveries
3470 Codeforces 814A: An abandoned sentiment from past
3469 Codeforces 813F: Bipartite Checking
3468 Codeforces 813E: Army Creation
3467 Codeforces 813D: Two Melodies
3466 Codeforces 813C: The Tag Game
3465 Codeforces 813B: The Golden Age
3464 Codeforces 813A: The Contest
3463 Codeforces 812E: Sagheer and Apple Tree
3462 Codeforces 812D: Sagheer and Kindergarten
3461 Codeforces 812C: Sagheer and Nubian Market
3460 Codeforces 812B: Sagheer, the Hausmeister
3459 Codeforces 812A: Sagheer and Crossroads
3458 Codeforces 811E: Vladik and Entertaining Flags
3457 Codeforces 811D: Vladik and Favorite Game
3456 Codeforces 811C: Vladik and Memorable Trip
3455 Codeforces 811B: Vladik and Complicated Book
3454 Codeforces 811A: Vladik and Courtesy
3453 Codeforces 810B: Summer sell-off
3452 Codeforces 810A: Straight <<A>>
3451 Codeforces 809E: Surprise me!
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