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)
10155 AtCoder ABC256: C. Filling 3x3 array
10154 AtCoder ABC256: B. Batters
10153 AtCoder ABC256: A. 2^N
10152 AtCoder ABC255: Ex. Range Harvest Query
10151 AtCoder ABC255: G. Constrained Nim
10150 AtCoder ABC255: F. Pre-order and In-order
10149 AtCoder ABC255: E. Lucky Numbers
10148 AtCoder ABC255: D. ±1 Operation 2
10147 AtCoder ABC255: C. ±1 Operation 1
10146 AtCoder ABC255: B. Light It Up
10145 AtCoder ABC255: A. You should output ARC, though this is ABC.
10144 AtCoder ABC254: Ex. Multiply or Divide by 2
10143 AtCoder ABC254: G. Elevators
10142 AtCoder ABC254: F. Rectangle GCD
10141 AtCoder ABC254: E. Small d and k
10140 AtCoder ABC254: D. Together Square
10139 AtCoder ABC254: C. K Swap
10138 AtCoder ABC254: B. Practical Computing
10137 AtCoder ABC254: A. Last Two Digits
10136 AtCoder ABC253: Ex. We Love Forest
10135 AtCoder ABC253: G. Swap Many Times
10134 AtCoder ABC253: F. Operations on a Matrix
10133 AtCoder ABC253: E. Distance Sequence
10132 AtCoder ABC253: D. FizzBuzz Sum Hard
10131 AtCoder ABC253: C. Max - Min Query
10130 AtCoder ABC253: B. Distance Between Tokens
10129 AtCoder ABC253: A. Median?
10128 AtCoder ABC252: Ex. K-th beautiful Necklace
10127 AtCoder ABC252: G. Pre-Order
10126 AtCoder ABC252: F. Bread
10125 AtCoder ABC252: E. Road Reduction
10124 AtCoder ABC252: D. Distinct Trio
10123 AtCoder ABC252: C. Slot Strategy
10122 AtCoder ABC252: B. Takahashi's Failure
10121 AtCoder ABC252: A. ASCII code
10120 AtCoder ABC251: Ex. Fill Triangle
10119 AtCoder ABC251: G. Intersection of Polygons
10118 AtCoder ABC251: F. Two Spanning Trees
10117 AtCoder ABC251: E. Tahakashi and Animals
10116 AtCoder ABC251: D. At Most 3 (Contestant ver.)
10115 AtCoder ABC251: C. Poem Online Judge
10114 AtCoder ABC251: B. At Most 3 (Judge ver.)
10113 AtCoder ABC251: A. Six Characters
10112 AtCoder ABC250: Ex. Trespassing Takahashi
10111 AtCoder ABC250: G. Stonks
10110 AtCoder ABC250: F. One Fourth
10109 AtCoder ABC250: E. Prefix Equality
10108 AtCoder ABC250: D. 250-like Number
10107 AtCoder ABC250: C. Adjacent Swaps
10106 AtCoder ABC250: B. Enlarged Checker Board
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