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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)
24705 DMOJ Mock CCC '23 2 S1 - Composite Fibonacci Numbers
24704 DMOJ NOIP '22 P4 - Contest
24703 DMOJ NOIP '22 P3 - Facility Construction
24702 DMOJ NOIP '22 P2 - Meow Meow
24701 DMOJ NOIP '22 P1 - Flower Planting
24700 DMOJ Mock CCC '23 1 S5 - The Obligatory Data Structures Problem
24699 DMOJ Mock CCC '23 1 S3 - Richard The Penguin
24698 DMOJ Mock CCC '23 1 S4 - Roger Says Yabe
24697 DMOJ Mock CCC '23 1 S2 - Keenan Hates Triangles
24696 DMOJ Mock CCC '23 1 S1 - Composite Fibonacci Numbers
24695 DMOJ Segment Tree Practice 4
24694 DMOJ Segment Tree Practice 3
24693 DMOJ COCI '11 Contest 3 #5 Plaće
24692 DMOJ Segment Tree Practice 2
24691 DMOJ Segment Tree Practice 1
24690 AtCoder XMASCON23: H. How to Pose Such a Problem
24689 AtCoder XMASCON23: G. Group Structure
24688 AtCoder XMASCON23: F. Failed Failure Link
24687 AtCoder XMASCON23: E. Exponent of PI
24686 AtCoder XMASCON23: D. Distance Construction
24685 AtCoder XMASCON23: C. Clamp Clamp Clamp
24684 AtCoder XMASCON23: B. Beautiful Rotation
24683 AtCoder XMASCON23: A. Art Irrationnel
24682 AtCoder PAST16-OPEN: O. 数列の足し算
24681 AtCoder PAST16-OPEN: N. ソートと関数
24680 AtCoder PAST16-OPEN: M. 線分の交差判定
24679 AtCoder PAST16-OPEN: L. 平均クエリ
24678 AtCoder PAST16-OPEN: K. マス目
24677 AtCoder PAST16-OPEN: J. 除夜の鐘
24676 AtCoder PAST16-OPEN: I. アメ
24675 AtCoder PAST16-OPEN: H. 休暇
24674 AtCoder PAST16-OPEN: G. N個の三角形
24673 AtCoder PAST16-OPEN: F. 式の評価
24672 AtCoder PAST16-OPEN: E. 10 の n 乗
24671 AtCoder PAST16-OPEN: D. 相対評価のスコア
24670 AtCoder PAST16-OPEN: C. コンテスト
24669 AtCoder PAST16-OPEN: B. スロット
24668 AtCoder PAST16-OPEN: A. ツバメ
24667 AtCoder PAST15-OPEN: O. 数列と素数
24666 AtCoder PAST15-OPEN: N. 度数分布
24665 AtCoder PAST15-OPEN: M. 点の距離
24664 AtCoder PAST15-OPEN: L. ビット行列
24663 AtCoder PAST15-OPEN: K. 入れ替えてソート
24662 AtCoder PAST15-OPEN: J. 忍者
24661 AtCoder PAST15-OPEN: I. 最大公約数の最大値
24660 AtCoder PAST15-OPEN: H. 和で表現
24659 AtCoder PAST15-OPEN: G. N-SAT
24658 AtCoder PAST15-OPEN: F. 番号付け
24657 AtCoder PAST15-OPEN: E. 合計得点
24656 AtCoder PAST15-OPEN: D. レコーダー
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