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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)
14855 AtCoder WUPC2012: B. パスワード
14854 AtCoder WUPC2012: A. 招待状
14853 AtCoder WTF19-OPEN: E. e
14852 AtCoder WTF19-OPEN: D. Distinct Boxes
14851 AtCoder WTF19-OPEN: C2. Triangular Lamps Hard
14850 AtCoder WTF19-OPEN: C1. Triangular Lamps Easy
14849 AtCoder WTF19-OPEN: B. Multiple of Nine
14848 AtCoder WTF19-OPEN: A. Magic
14847 AtCoder WN2017_1: A. Satellite data compression
14846 AtCoder UTPC2022: O. Move to Rest
14845 AtCoder UTPC2022: N. 01 String Game
14844 AtCoder UTPC2022: M. Minimize XOR by Redistribution
14843 AtCoder UTPC2022: L. Small RPS Tournament
14842 AtCoder UTPC2022: K. Grid Coloring
14841 AtCoder UTPC2022: J. Divide and Sort
14840 AtCoder UTPC2022: I. Which must be deleted?
14839 AtCoder UTPC2022: H. Digit Slot
14838 AtCoder UTPC2022: G. K flipping
14837 AtCoder UTPC2022: F. K inversions
14836 AtCoder UTPC2022: E. Parallel Swapping
14835 AtCoder UTPC2022: D. Balance
14834 AtCoder UTPC2022: C. Nim is Time-consuming
14833 AtCoder UTPC2022: B. Cross Laser Beam
14832 AtCoder UTPC2022: A. Shuffle and GCD
14831 AtCoder UTPC2021: N. Tree Swapping
14830 AtCoder UTPC2021: M. Open the Door
14829 AtCoder UTPC2021: L. Maze Game
14828 AtCoder UTPC2021: K. Divide Polynomials by #Subset Sums
14827 AtCoder UTPC2021: J. Do you like Interval Scheduling Problems?
14826 AtCoder UTPC2021: I. Card Decks
14825 AtCoder UTPC2021: H. Quantum Multiplication
14824 AtCoder UTPC2021: G. Matrix Compressor
14823 AtCoder UTPC2021: F. Red and Blue Medals
14822 AtCoder UTPC2021: E. Bounding Box
14821 AtCoder UTPC2021: D. Chain Graph Pair
14820 AtCoder UTPC2021: C. Product Matching
14819 AtCoder UTPC2021: B. Swap and Maximize
14818 AtCoder UTPC2021: A. Make UTPC
14817 AtCoder UTPC2020: M. Not Another Geometry Game!
14816 AtCoder UTPC2020: L. Euclidean Distance Product
14815 AtCoder UTPC2020: K. Special Chopsticks
14814 AtCoder UTPC2020: J. Merge and Decrement
14813 AtCoder UTPC2020: I. UTPC Kingdom
14812 AtCoder UTPC2020: H. Grid Eraser
14811 AtCoder UTPC2020: G. D. D. Construction
14810 AtCoder UTPC2020: F. Save Your MP
14809 AtCoder UTPC2020: E. Sort Segments
14808 AtCoder UTPC2020: D. Idol Group Costume
14807 AtCoder UTPC2020: C. Range Flip
14806 AtCoder UTPC2020: B. JANKEN Machine
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