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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)
4500 Codeforces 1044B: Intersecting Subtrees
4499 Codeforces 1044A: The Tower is Going Home
4498 Codeforces 1043G: Speckled Band
4497 Codeforces 1043F: Make It One
4496 Codeforces 1043E: Train Hard, Win Easy
4495 Codeforces 1043D: Mysterious Crime
4494 Codeforces 1043C: Smallest Word
4493 Codeforces 1043B: Lost Array
4492 Codeforces 1043A: Elections
4491 Codeforces 1042F: Leaf Sets
4490 Codeforces 1042E: Vasya and Magic Matrix
4489 Codeforces 1042D: Petya and Array
4488 Codeforces 1042C: Array Product
4487 Codeforces 1042B: Vitamins
4486 Codeforces 1042A: Benches
4485 Codeforces 1041F: Ray in the tube
4484 Codeforces 1041E: Tree Reconstruction
4483 Codeforces 1041D: Glider
4482 Codeforces 1041C: Coffee Break
4481 Codeforces 1041B: Buying a TV Set
4480 Codeforces 1041A: Heist
4479 Codeforces 1040B: Shashlik Cooking
4478 Codeforces 1040A: Palindrome Dance
4477 Codeforces 1039E: Summer Oenothera Exhibition
4476 Codeforces 1039D: You Are Given a Tree
4475 Codeforces 1039C: Network Safety
4474 Codeforces 1039B: Subway Pursuit
4473 Codeforces 1039A: Timetable
4472 Codeforces 1038F: Wrap Around
4471 Codeforces 1038E: Maximum Matching
4470 Codeforces 1038D: Slime
4469 Codeforces 1038C: Gambling
4468 Codeforces 1038B: Non-Coprime Partition
4467 Codeforces 1038A: Equality
4466 Codeforces 1037H: Security
4465 Codeforces 1037G: A Game on Strings
4464 Codeforces 1037F: Maximum Reduction
4463 Codeforces 1037E: Trips
4462 Codeforces 1037D: Valid BFS?
4461 Codeforces 1037C: Equalize
4460 Codeforces 1037B: Reach Median
4459 Codeforces 1037A: Packets
4458 Codeforces 1036G: Sources and Sinks
4457 Codeforces 1036F: Relatively Prime Powers
4456 Codeforces 1036E: Covered Points
4455 Codeforces 1036D: Vasya and Arrays
4454 Codeforces 1036C: Classy Numbers
4453 Codeforces 1036B: Diagonal Walking v.2
4452 Codeforces 1036A: Function Height
4451 Codeforces 1034E: Little C Loves 3 III
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