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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)
14605 AtCoder TTPC2015: F. レシート
14604 AtCoder TTPC2015: E. マス目色ぬり
14603 AtCoder TTPC2015: D. 文字列と素数
14602 AtCoder TTPC2015: C. おおおかやま
14601 AtCoder TTPC2015: B. ラー油
14600 AtCoder TTPC2015: A. ぼくの学生証
14599 AtCoder TRICKY: E. 雲と影
14598 AtCoder TRICKY: D. 高橋くんレーシング
14597 AtCoder TRICKY: C. 階乗と素因数
14596 AtCoder TRICKY: B. 一変数方程式
14595 AtCoder TRICKY: A. 整数割り算
14594 AtCoder TOYOTA-HC-2023SPRING: A. Container Loading
14593 AtCoder TOYOTA2023SPRING-FINAL-OPEN: G. Git Gud
14592 AtCoder TOYOTA2023SPRING-FINAL-OPEN: F. Forbidden Pattern
14591 AtCoder TOYOTA2023SPRING-FINAL-OPEN: E. East-Northeast
14590 AtCoder TOYOTA2023SPRING-FINAL-OPEN: D. Dual Rotation
14589 AtCoder TOYOTA2023SPRING-FINAL-OPEN: C. Count Dividing XOR
14588 AtCoder TOYOTA2023SPRING-FINAL-OPEN: B. Best Strategy
14587 AtCoder TOYOTA2023SPRING-FINAL-OPEN: A. Area Sum
14586 AtCoder TOKIOMARINE2020: F. Triangles
14585 AtCoder TOKIOMARINE2020: E. O(rand)
14584 AtCoder TOKIOMARINE2020: D. Knapsack Queries on a tree
14583 AtCoder TOKIOMARINE2020: C. Lamps
14582 AtCoder TOKIOMARINE2020: B. Tag
14581 AtCoder TOKIOMARINE2020: A. Nickname
14580 AtCoder TKPPC6-2: M. 山分け
14579 AtCoder TKPPC6-2: L. Go To
14578 AtCoder TKPPC6-2: K. Ball in the Box 2
14577 AtCoder TKPPC6-2: J. Common Divisors Shortest Path Queries
14576 AtCoder TKPPC6-2: I. 旅人計画問題2
14575 AtCoder TKPPC6-2: H. Reversi Pieces
14574 AtCoder TKPPC6-2: G. Must be Distinct!
14573 AtCoder TKPPC6-2: F. Shortest Path Construction
14572 AtCoder TKPPC6-2: E. Exactly K Triangles
14571 AtCoder TKPPC6-2: D. NG Word Game
14570 AtCoder TKPPC6-2: C. Strange Paper
14569 AtCoder TKPPC6-2: B. Replace to the Other
14568 AtCoder TKPPC6-2: A. >_<
14567 AtCoder TKPPC6-1: P. Game on Colored Tree
14566 AtCoder TKPPC6-1: O. ペンギンくんの仕事計画
14565 AtCoder TKPPC6-1: N. Jump and Walk
14564 AtCoder TKPPC6-1: M. To The LCA
14563 AtCoder TKPPC6-1: L. Polyomino Tiling
14562 AtCoder TKPPC6-1: K. Dial Key
14561 AtCoder TKPPC6-1: J. Two Paths
14560 AtCoder TKPPC6-1: I. 1<->k
14559 AtCoder TKPPC6-1: H. Marbles and Boxes
14558 AtCoder TKPPC6-1: G. At Most Two
14557 AtCoder TKPPC6-1: F. Frog and Tadpole
14556 AtCoder TKPPC6-1: E. And Xor Or
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