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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)
24068 Codeforces 1886D: Monocarp and the Set
24067 Codeforces 1886C: Decreasing String
24066 Codeforces 1886B: Fear of the Dark
24065 Codeforces 1886A: Sum of Three
24064 Codeforces 1884E: Hard Design
24063 Codeforces 1884D: Counting Rhyme
24062 Codeforces 1884C: Medium Design
24061 Codeforces 1884B: Haunted House
24060 Codeforces 1884A: Simple Design
24059 Codeforces 1883G2: Dances (Hard Version)
24058 Codeforces 1883G1: Dances (Easy version)
24057 Codeforces 1883F: You Are So Beautiful
24056 Codeforces 1883E: Look Back
24055 Codeforces 1883D: In Love
24054 Codeforces 1883C: Raspberries
24053 Codeforces 1883B: Chemistry
24052 Codeforces 1883A: Morning
24051 Codeforces 1881G: Anya and the Mysterious String
24050 Codeforces 1881F: Minimum Maximum Distance
24049 Codeforces 1881E: Block Sequence
24048 Codeforces 1881D: Divide and Equalize
24047 Codeforces 1881C: Perfect Square
24046 Codeforces 1881B: Three Threadlets
24045 Codeforces 1881A: Don't Try to Count
24044 Codeforces 1877C: Joyboard
24043 Codeforces 1877A: Goals of Victory
24042 Codeforces 1876G: Clubstep
24041 Codeforces 1876F: Indefinite Clownfish
24040 Codeforces 1876E: Ball-Stackable
24039 Codeforces 1876D: Lexichromatography
24038 Codeforces 1876C: Autosynthesis
24037 Codeforces 1876B: Effects of Anti Pimples
24036 Codeforces 1876A: Helmets in Night Light
24009 Codeforces 1882E2: Two Permutations (Hard Version)
24008 Codeforces 1882E1: Two Permutations (Easy Version)
24007 Codeforces 1882D: Tree XOR
24006 Codeforces 1882C: Card Game
24005 Codeforces 1882B: Sets and Union
24004 Codeforces 1882A: Increasing Sequence
24003 Codeforces 1879F: Last Man Standing
24002 Codeforces 1879E: Interactive Game with Coloring
24001 Codeforces 1879D: Sum of XOR Functions
24000 Codeforces 1879C: Make it Alternating
23999 Codeforces 1879B: Chips on the Board
23998 Codeforces 1879A: Rigged!
23997 Codeforces 1878G: wxhtzdy ORO Tree
23996 Codeforces 1878F: Vasilije Loves Number Theory
23995 Codeforces 1878E: Iva & Pav
23994 Codeforces 1878D: Reverse Madness
23993 Codeforces 1878C: Vasilije in Cacak
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