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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)
13655 AtCoder NIKKEI2019-2-FINAL: G. Road Trip
13654 AtCoder NIKKEI2019-2-FINAL: F. Jumping over 2
13653 AtCoder NIKKEI2019-2-FINAL: E. Notorious B.I.T.
13652 AtCoder NIKKEI2019-2-FINAL: D. 木、
13651 AtCoder NIKKEI2019-2-FINAL: C. Largest N
13650 AtCoder NIKKEI2019-2-FINAL: B. NIKKEI String
13649 AtCoder NIKKEI2019-2-FINAL: A. Count Triplets
13648 AtCoder NEWJUDGE-2308-HEURISTIC: A. AtCoder Contest Scheduling (Online Version)
13647 AtCoder NADAFES2022_DAY2: P. Turn it Over
13646 AtCoder NADAFES2022_DAY2: O. Simple Inversion Problem
13645 AtCoder NADAFES2022_DAY2: N. All Crosses
13644 AtCoder NADAFES2022_DAY2: M. Swapping Brackets
13643 AtCoder NADAFES2022_DAY2: L. Min Diff Min
13642 AtCoder NADAFES2022_DAY2: K. Exhibition 3
13641 AtCoder NADAFES2022_DAY2: J. Sum Equality
13640 AtCoder NADAFES2022_DAY2: I. Product of LCM of GCD
13639 AtCoder NADAFES2022_DAY2: H. Tourist on Graph
13638 AtCoder NADAFES2022_DAY2: G. Interval GCD
13637 AtCoder NADAFES2022_DAY2: F. Charge
13636 AtCoder NADAFES2022_DAY2: E. Hamiltonian Circuit
13635 AtCoder NADAFES2022_DAY2: D. NPCA Network
13634 AtCoder NADAFES2022_DAY2: C. Time Bombs
13633 AtCoder NADAFES2022_DAY2: B. Min Max Min
13632 AtCoder NADAFES2022_DAY2: A. ACPN
13631 AtCoder NADAFES2022_DAY1: P. Sum of Max of Difference
13630 AtCoder NADAFES2022_DAY1: O. Swapping Desks
13629 AtCoder NADAFES2022_DAY1: N. Range Flip
13628 AtCoder NADAFES2022_DAY1: M. Random Drawing
13627 AtCoder NADAFES2022_DAY1: L. Lexicographic Euler Tour
13626 AtCoder NADAFES2022_DAY1: K. Li
13625 AtCoder NADAFES2022_DAY1: J. Excluded LCM
13624 AtCoder NADAFES2022_DAY1: I. NPCA Kingdom
13623 AtCoder NADAFES2022_DAY1: H. Traveling PCT Problem
13622 AtCoder NADAFES2022_DAY1: G. Road Closed
13621 AtCoder NADAFES2022_DAY1: F. Mth Next Permutation
13620 AtCoder NADAFES2022_DAY1: E. Even Degree
13619 AtCoder NADAFES2022_DAY1: D. Double Permutations
13618 AtCoder NADAFES2022_DAY1: C. Flood
13617 AtCoder NADAFES2022_DAY1: B. Exist Multiples
13616 AtCoder NADAFES2022_DAY1: A. Max Inversion
13615 AtCoder MUJIN-PC-2018: H. タイル張り
13614 AtCoder MUJIN-PC-2018: G. 移動
13613 AtCoder MUJIN-PC-2018: F. チーム分け
13612 AtCoder MUJIN-PC-2018: E. 迷路
13611 AtCoder MUJIN-PC-2018: D. うほょじご
13610 AtCoder MUJIN-PC-2018: C. 右折
13609 AtCoder MUJIN-PC-2018: B. セキュリティ
13608 AtCoder MUJIN-PC-2018: A. コンテスト名
13607 AtCoder MUJIN-PC-2017: D. Oriented Tree
13606 AtCoder MUJIN-PC-2017: C. Robot and String
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