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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)
24655 AtCoder PAST15-OPEN: C. 円の描画
24654 AtCoder PAST15-OPEN: B. 殿堂入り
24653 AtCoder PAST15-OPEN: A. ペナルティ
24652 AtCoder OUPC2023-DAY1: Q. Kurukuru
24651 AtCoder OUPC2023-DAY1: P. Score for Cutting Graph
24650 AtCoder OUPC2023-DAY1: O. Special Matrix
24649 AtCoder OUPC2023-DAY1: N. Bench
24648 AtCoder OUPC2023-DAY1: M. Can't Be UT
24647 AtCoder OUPC2023-DAY1: L. KowerKoint Doko
24646 AtCoder OUPC2023-DAY1: K. Minimize Transfer Time
24645 AtCoder OUPC2023-DAY1: J. Sum Sum
24644 AtCoder OUPC2023-DAY1: I. Min!? Max!? Max!? Min!?
24643 AtCoder OUPC2023-DAY1: H. Wonderful Stage
24642 AtCoder OUPC2023-DAY1: G. Impassable Game
24641 AtCoder OUPC2023-DAY1: F. Remainder of Max Problem
24640 AtCoder OUPC2023-DAY1: E. Han Burger 2
24639 AtCoder OUPC2023-DAY1: D. Han Burger
24638 AtCoder OUPC2023-DAY1: C. Caesar Cipher
24637 AtCoder OUPC2023-DAY1: B. Gomamayo
24636 AtCoder OUPC2023-DAY1: A. Mijingiri
24635 AtCoder JOI2024YO2: E. 高速道路の通行料金 (Highway Tolls)
24634 AtCoder JOI2024YO2: D. 庭園 2 (Garden 2)
24633 AtCoder JOI2024YO2: C. 白色光 2 (White Light 2)
24632 AtCoder JOI2024YO2: B. 買い物 2 (Shopping 2)
24631 AtCoder JOI2024YO2: A. カードゲーム 2 (Card Game 2)
24630 AtCoder JOI2024YO1C: D. 差 (Difference)
24629 AtCoder JOI2024YO1C: C. 揃った文字 (Matched Letters)
24628 AtCoder JOI2024YO1C: B. 桁 (Digit)
24627 AtCoder JOI2024YO1C: A. 分 (Minutes)
24626 AtCoder ARC170: F. Edge Deletion 2
24625 AtCoder ARC170: E. BDFS
24624 AtCoder ARC170: D. Triangle Card Game
24623 AtCoder ARC170: C. Prefix Mex Sequence
24622 AtCoder ARC170: B. Arithmetic Progression Subsequence
24621 AtCoder ARC170: A. Yet Another AB Problem
24620 AtCoder ARC169: F. Large DP Table
24619 AtCoder ARC169: E. Avoid Boring Matches
24618 AtCoder ARC169: D. Add to Make a Permutation
24617 AtCoder ARC169: C. Not So Consecutive
24616 AtCoder ARC169: B. Subsegments with Small Sums
24615 AtCoder ARC169: A. Please Sign
24614 AtCoder ARC168: F. Up-Down Queries
24613 AtCoder ARC168: E. Subsegments with Large Sums
24612 AtCoder ARC168: D. Maximize Update
24611 AtCoder ARC168: C. Swap Characters
24610 AtCoder ARC168: B. Arbitrary Nim
24609 AtCoder ARC168: A. <Inversion>
24608 AtCoder AHC029: A. Business Simulation Game
24607 AtCoder AHC028: A. Lucky Words
24606 AtCoder AHC027: A. Recurring Cleaning Route
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