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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)
4450 Codeforces 1034D: Intervals of Intervals
4449 Codeforces 1034C: Region Separation
4448 Codeforces 1034B: Little C Loves 3 II
4447 Codeforces 1034A: Enlarge GCD
4446 Codeforces 1033G: Chip Game
4445 Codeforces 1033F: Boolean Computer
4444 Codeforces 1033E: Hidden Bipartite Graph
4443 Codeforces 1033D: Divisors
4442 Codeforces 1033C: Permutation Game
4441 Codeforces 1033B: Square Difference
4440 Codeforces 1033A: King Escape
4439 Codeforces 1032G: Chattering
4438 Codeforces 1032F: Vasya and Maximum Matching
4437 Codeforces 1032E: The Unbearable Lightness of Weights
4436 Codeforces 1032D: Barcelonian Distance
4435 Codeforces 1032C: Playing Piano
4434 Codeforces 1032B: Personalized Cup
4433 Codeforces 1032A: Kitchen Utensils
4432 Codeforces 1031F: Familiar Operations
4431 Codeforces 1031E: Triple Flips
4430 Codeforces 1031D: Minimum path
4429 Codeforces 1031C: Cram Time
4428 Codeforces 1031B: Curiosity Has No Limits
4427 Codeforces 1031A: Golden Plate
4426 Codeforces 1030G: Linear Congruential Generator
4425 Codeforces 1030F: Putting Boxes Together
4424 Codeforces 1030E: Vasya and Good Sequences
4423 Codeforces 1030D: Vasya and Triangle
4422 Codeforces 1030C: Vasya and Golden Ticket
4421 Codeforces 1030B: Vasya and Cornfield
4420 Codeforces 1030A: In Search of an Easy Problem
4419 Codeforces 1029F: Multicolored Markers
4418 Codeforces 1029E: Tree with Small Distances
4417 Codeforces 1029D: Concatenated Multiples
4416 Codeforces 1029C: Maximal Intersection
4415 Codeforces 1029B: Creating the Contest
4414 Codeforces 1029A: Many Equal Substrings
4413 Codeforces 1028H: Make Square
4412 Codeforces 1028G: Guess the number
4411 Codeforces 1028F: Make Symmetrical
4410 Codeforces 1028E: Restore Array
4409 Codeforces 1028D: Order book
4408 Codeforces 1028C: Rectangles
4407 Codeforces 1028B: Unnatural Conditions
4406 Codeforces 1028A: Find Square
4405 Codeforces 1027G: X-mouse in the Campus
4404 Codeforces 1027F: Session in BSU
4403 Codeforces 1027E: Inverse Coloring
4402 Codeforces 1027D: Mouse Hunt
4401 Codeforces 1027C: Minimum Value Rectangle
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