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)
10105 AtCoder ABC250: A. Adjacent Squares
10104 AtCoder ABC249: Ex. Dye Color
10103 AtCoder ABC249: G. Xor Cards
10102 AtCoder ABC249: F. Ignore Operations
10101 AtCoder ABC249: E. RLE
10100 AtCoder ABC249: D. Index Trio
10099 AtCoder ABC249: C. Just K
10098 AtCoder ABC249: B. Perfect String
10097 AtCoder ABC249: A. Jogging
10096 AtCoder ABC248: Ex. Beautiful Subsequences
10095 AtCoder ABC248: G. GCD cost on the tree
10094 AtCoder ABC248: F. Keep Connect
10093 AtCoder ABC248: E. K-colinear Line
10092 AtCoder ABC248: D. Range Count Query
10091 AtCoder ABC248: C. Dice Sum
10090 AtCoder ABC248: B. Slimes
10089 AtCoder ABC248: A. Lacked Number
10088 AtCoder ABC247: Ex. Rearranging Problem
10087 AtCoder ABC247: G. Dream Team
10086 AtCoder ABC247: F. Cards
10085 AtCoder ABC247: E. Max Min
10084 AtCoder ABC247: D. Cylinder
10083 AtCoder ABC247: C. 1 2 1 3 1 2 1
10082 AtCoder ABC247: B. Unique Nicknames
10081 AtCoder ABC247: A. Move Right
10080 AtCoder ABC246: Ex. 01? Queries
10079 AtCoder ABC246: G. Game on Tree 3
10078 AtCoder ABC246: F. typewriter
10077 AtCoder ABC246: E. Bishop 2
10076 AtCoder ABC246: D. 2-variable Function
10075 AtCoder ABC246: C. Coupon
10074 AtCoder ABC246: B. Get Closer
10073 AtCoder ABC246: A. Four Points
10072 AtCoder ABC245: Ex. Product Modulo 2
10071 AtCoder ABC245: G. Foreign Friends
10070 AtCoder ABC245: F. Endless Walk
10069 AtCoder ABC245: E. Wrapping Chocolate
10068 AtCoder ABC245: D. Polynomial division
10067 AtCoder ABC245: C. Choose Elements
10066 AtCoder ABC245: B. Mex
10065 AtCoder ABC245: A. Good morning
10064 AtCoder ABC244: Ex. Linear Maximization
10063 AtCoder ABC244: G. Construct Good Path
10062 AtCoder ABC244: F. Shortest Good Path
10061 AtCoder ABC244: E. King Bombee
10060 AtCoder ABC244: D. Swap Hats
10059 AtCoder ABC244: C. Yamanote Line Game
10058 AtCoder ABC244: B. Go Straight and Turn Right
10057 AtCoder ABC244: A. Last Letter
10056 AtCoder ABC243: Ex. Builder Takahashi (Enhanced version)
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