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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)
2005 Codeforces 464E: The Classic Problem
2004 Codeforces 464D: World of Darkraft - 2
2003 Codeforces 464C: Substitutes in Number
2002 Codeforces 464B: Restore Cube
2001 Codeforces 464A: No to Palindromes!
2000 Codeforces 463E: Caisa and Tree
1999 Codeforces 463D: Gargari and Permutations
1998 Codeforces 463C: Gargari and Bishops
1997 Codeforces 463B: Caisa and Pylons
1996 Codeforces 463A: Caisa and Sugar
1995 Codeforces 462B: Appleman and Card Game
1994 Codeforces 462A: Appleman and Easy Task
1993 Codeforces 461E: Appleman and a Game
1992 Codeforces 461D: Appleman and Complicated Task
1991 Codeforces 461C: Appleman and a Sheet of Paper
1990 Codeforces 461B: Appleman and Tree
1989 Codeforces 461A: Appleman and Toastman
1988 Codeforces 460E: Roland and Rose
1987 Codeforces 460D: Little Victor and Set
1986 Codeforces 460C: Present
1985 Codeforces 460B: Little Dima and Equation
1984 Codeforces 460A: Vasya and Socks
1983 Codeforces 459E: Pashmak and Graph
1982 Codeforces 459D: Pashmak and Parmida's problem
1981 Codeforces 459C: Pashmak and Buses
1980 Codeforces 459B: Pashmak and Flowers
1979 Codeforces 459A: Pashmak and Garden
1978 Codeforces 457F: An easy problem about trees
1977 Codeforces 457E: Flow Optimality
1976 Codeforces 457D: Bingo!
1975 Codeforces 457C: Elections
1974 Codeforces 457B: Distributed Join
1973 Codeforces 457A: Golden System
1972 Codeforces 456B: Fedya and Maths
1971 Codeforces 456A: Laptops
1970 Codeforces 455E: Function
1969 Codeforces 455D: Serega and Fun
1968 Codeforces 455C: Civilization
1967 Codeforces 455B: A Lot of Games
1966 Codeforces 455A: Boredom
1965 Codeforces 454B: Little Pony and Sort by Shift
1964 Codeforces 454A: Little Pony and Crystal Mine
1963 Codeforces 453E: Little Pony and Lord Tirek
1962 Codeforces 453D: Little Pony and Elements of Harmony
1961 Codeforces 453C: Little Pony and Summer Sun Celebration
1960 Codeforces 453B: Little Pony and Harmony Chest
1959 Codeforces 453A: Little Pony and Expected Maximum
1958 Codeforces 452F: Permutation
1957 Codeforces 452E: Three strings
1956 Codeforces 452D: Washer, Dryer, Folder
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