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)
9905 AtCoder ABC225: A. Distinct Strings
9904 AtCoder ABC224: H. Security Camera 2
9903 AtCoder ABC224: G. Roll or Increment
9902 AtCoder ABC224: F. Problem where +s Separate Digits
9901 AtCoder ABC224: E. Integers on Grid
9900 AtCoder ABC224: D. 8 Puzzle on Graph
9899 AtCoder ABC224: C. Triangle?
9898 AtCoder ABC224: B. Mongeness
9897 AtCoder ABC224: A. Tires
9896 AtCoder ABC223: H. Xor Query
9895 AtCoder ABC223: G. Vertex Deletion
9894 AtCoder ABC223: F. Parenthesis Checking
9893 AtCoder ABC223: E. Placing Rectangles
9892 AtCoder ABC223: D. Restricted Permutation
9891 AtCoder ABC223: C. Doukasen
9890 AtCoder ABC223: B. String Shifting
9889 AtCoder ABC223: A. Exact Price
9888 AtCoder ABC222: H. Beautiful Binary Tree
9887 AtCoder ABC222: G. 222
9886 AtCoder ABC222: F. Expensive Expense
9885 AtCoder ABC222: E. Red and Blue Tree
9884 AtCoder ABC222: D. Between Two Arrays
9883 AtCoder ABC222: C. Swiss-System Tournament
9882 AtCoder ABC222: B. Failing Grade
9881 AtCoder ABC222: A. Four Digits
9880 AtCoder ABC221: H. Count Multiset
9879 AtCoder ABC221: G. Jumping sequence
9878 AtCoder ABC221: F. Diameter set
9877 AtCoder ABC221: E. LEQ
9876 AtCoder ABC221: D. Online games
9875 AtCoder ABC221: C. Select Mul
9874 AtCoder ABC221: B. typo
9873 AtCoder ABC221: A. Seismic magnitude scales
9872 AtCoder ABC220: H. Security Camera
9871 AtCoder ABC220: G. Isosceles Trapezium
9870 AtCoder ABC220: F. Distance Sums 2
9869 AtCoder ABC220: E. Distance on Large Perfect Binary Tree
9868 AtCoder ABC220: D. FG operation
9867 AtCoder ABC220: C. Long Sequence
9866 AtCoder ABC220: B. Base K
9865 AtCoder ABC220: A. Find Multiple
9864 AtCoder ABC219: H. Candles
9863 AtCoder ABC219: G. Propagation
9862 AtCoder ABC219: F. Cleaning Robot
9861 AtCoder ABC219: E. Moat
9860 AtCoder ABC219: D. Strange Lunchbox
9859 AtCoder ABC219: C. Neo-lexicographic Ordering
9858 AtCoder ABC219: B. Maritozzo
9857 AtCoder ABC219: A. AtCoder Quiz 2
9856 AtCoder ABC218: H. Red and Blue Lamps
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