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)
24855 DMOJ HHPC1 P2 - Yuniformity Challenge
24854 DMOJ HHPC1 P5 - Yunity Grouping Objects
24853 DMOJ HHPC1 P3 - Yonder Ridge
24852 DMOJ HHPC1 P6 - Yarn Street's Strategic Shopping
24851 DMOJ HHPC1 P4 - Yet Another A+B Problem
24850 DMOJ Yet Another Contest 8 P2 - No More Modern Art
24849 DMOJ Yet Another Contest 8 P1 - Permutation Sorting
24848 DMOJ Yet Another Contest 8 P5 - Hidden Tree
24847 AtCoder JOI2024HO: E. 道路網の整備 2 (Road Service 2)
24846 AtCoder JOI2024HO: D. プレゼント交換 (Gift Exchange)
24845 AtCoder JOI2024HO: C. マラソン大会 2 (Marathon Race 2)
24844 AtCoder JOI2024HO: B. 建設事業 2 (Construction Project 2)
24843 AtCoder JOI2024HO: A. 室温 (Room Temperature)
24842 AtCoder ARC171: F. Both Reversible
24841 AtCoder ARC171: E. Rookhopper's Tour
24840 AtCoder ARC171: D. Rolling Hash
24839 AtCoder ARC171: C. Swap on Tree
24838 AtCoder ARC171: B. Chmax
24837 AtCoder ARC171: A. No Attacking
24836 AtCoder ABC340: G. Leaf Color
24835 AtCoder ABC340: F. S = 1
24834 AtCoder ABC340: E. Mancala 2
24833 AtCoder ABC340: D. Super Takahashi Bros.
24832 AtCoder ABC340: C. Divide and Divide
24831 AtCoder ABC340: B. Append
24830 AtCoder ABC340: A. Arithmetic Progression
24829 AtCoder ABC339: G. Smaller Sum
24828 AtCoder ABC339: F. Product Equality
24827 AtCoder ABC339: E. Smooth Subsequence
24826 AtCoder ABC339: D. Synchronized Players
24825 AtCoder ABC339: C. Perfect Bus
24824 AtCoder ABC339: B. Langton's Takahashi
24823 AtCoder ABC339: A. TLD
24822 Codeforces 1927G: Paint Charges
24821 Codeforces 1927F: Microcycle
24820 Codeforces 1927E: Klever Permutation
24819 Codeforces 1927D: Find the Different Ones!
24818 Codeforces 1927C: Choose the Different Ones!
24817 Codeforces 1927B: Following the String
24816 Codeforces 1927A: Make it White
24815 Codeforces 1918G: Permutation of Given
24814 Codeforces 1918F: Caterpillar on a Tree
24813 Codeforces 1918E: ace5 and Task Order
24812 Codeforces 1918D: Blocking Elements
24811 Codeforces 1918C: XOR-distance
24810 Codeforces 1918B: Minimize Inversions
24809 Codeforces 1918A: Brick Wall
24808 DMOJ COCI '23 Contest 3 #5 Slučajna Cesta
24807 DMOJ COCI '23 Contest 3 #4 Restorani
24806 DMOJ COCI '23 Contest 3 #3 Milano C.le
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