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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)
11755 AtCoder ARC151: A. Equal Hamming Distances
11754 AtCoder ARC150: F. Constant Sum Subsequence
11753 AtCoder ARC150: E. Weathercock
11752 AtCoder ARC150: D. Removing Gacha
11751 AtCoder ARC150: C. Path and Subsequence
11750 AtCoder ARC150: B. Make Divisible
11749 AtCoder ARC150: A. Continuous 1
11748 AtCoder ARC149: F. Rational Number System
11747 AtCoder ARC149: E. Sliding Window Sort
11746 AtCoder ARC149: D. Simultaneous Sugoroku
11745 AtCoder ARC149: C. Avoid Prime Sum
11744 AtCoder ARC149: B. Two LIS Sum
11743 AtCoder ARC149: A. Repdigit Number
11742 AtCoder ARC148: F. 998244353 → 1000000007
11741 AtCoder ARC148: E. ≥ K
11740 AtCoder ARC148: D. mod M Game
11739 AtCoder ARC148: C. Lights Out on Tree
11738 AtCoder ARC148: B. dp
11737 AtCoder ARC148: A. mod M
11736 AtCoder ARC147: F. Again ABC String
11735 AtCoder ARC147: E. Examination
11734 AtCoder ARC147: D. Sets Scores
11733 AtCoder ARC147: C. Min Diff Sum
11732 AtCoder ARC147: B. Swap to Sort
11731 AtCoder ARC147: A. Max Mod Min
11730 AtCoder ARC146: F. Simple Solitaire
11729 AtCoder ARC146: E. Simple Speed
11728 AtCoder ARC146: D. >=<
11727 AtCoder ARC146: C. Even XOR
11726 AtCoder ARC146: B. Plus and AND
11725 AtCoder ARC146: A. Three Cards
11724 AtCoder ARC145: F. Modulo Sum of Increasing Sequences
11723 AtCoder ARC145: E. Adjacent XOR
11722 AtCoder ARC145: D. Non Arithmetic Progression Set
11721 AtCoder ARC145: C. Split and Maximize
11720 AtCoder ARC145: B. AB Game
11719 AtCoder ARC145: A. AB Palindrome
11718 AtCoder ARC144: F. Arithmetic Sequence Nim
11717 AtCoder ARC144: E. GCD of Path Weights
11716 AtCoder ARC144: D. AND OR Equation
11715 AtCoder ARC144: C. K Derangement
11714 AtCoder ARC144: B. Gift Tax
11713 AtCoder ARC144: A. Digit Sum of 2x
11712 AtCoder ARC143: F. Counting Subsets
11711 AtCoder ARC143: E. Reversi
11710 AtCoder ARC143: D. Bridges
11709 AtCoder ARC143: C. Piles of Pebbles
11708 AtCoder ARC143: B. Counting Grids
11707 AtCoder ARC143: A. Three Integers
11706 AtCoder ARC142: F. Paired Wizards
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