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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)
13540 AtCoder MATH-AND-ALGORITHM: 082. Interval Scheduling Problem
13539 AtCoder MATH-AND-ALGORITHM: 081. Bill Changing Problem
13538 AtCoder MATH-AND-ALGORITHM: 080. Difference Optimization 2
13537 AtCoder MATH-AND-ALGORITHM: 078. Difference Optimization 1
13536 AtCoder MATH-AND-ALGORITHM: 077. Distance Sum
13535 AtCoder MATH-AND-ALGORITHM: 075. Pyramid
13534 AtCoder MATH-AND-ALGORITHM: 074. Sum of difference Easy
13533 AtCoder MATH-AND-ALGORITHM: 073. Sum of Maximum
13532 AtCoder MATH-AND-ALGORITHM: 071. Linear Programming
13531 AtCoder MATH-AND-ALGORITHM: 068. Number of Multiples 2
13530 AtCoder MATH-AND-ALGORITHM: 066. Three Cards
13529 AtCoder MATH-AND-ALGORITHM: 064. All Zero
13528 AtCoder MATH-AND-ALGORITHM: 063. Move on Squares 2
13527 AtCoder MATH-AND-ALGORITHM: 061. Stones Game 2
13526 AtCoder MATH-AND-ALGORITHM: 002. Sum of 3 Integers
13525 AtCoder MATH-AND-ALGORITHM: 060. Stones Game 1
13524 AtCoder MATH-AND-ALGORITHM: 059. Power of Two
13523 AtCoder MATH-AND-ALGORITHM: 058. Move on Squares 1
13522 AtCoder MATH-AND-ALGORITHM: 057. Domino Tiling
13521 AtCoder MATH-AND-ALGORITHM: 056. Recurrence Formula 2
13520 AtCoder MATH-AND-ALGORITHM: 055. Recurrence Formula 1
13519 AtCoder MATH-AND-ALGORITHM: 054. Fibonacci Hard (mod 1000000000)
13518 AtCoder MATH-AND-ALGORITHM: 053. Sum of 4^N
13517 AtCoder MATH-AND-ALGORITHM: 051. Combination Hard
13516 AtCoder MATH-AND-ALGORITHM: 050. Power
13515 AtCoder MATH-AND-ALGORITHM: 049. Fibonacci Easy (mod 1000000007)
13514 AtCoder MATH-AND-ALGORITHM: 047. Bipartite Graph
13513 AtCoder MATH-AND-ALGORITHM: 044. Shortest Path Problem
13512 AtCoder MATH-AND-ALGORITHM: 043. Is It Connected?
13511 AtCoder MATH-AND-ALGORITHM: 041. Convenience Store 2
13510 AtCoder MATH-AND-ALGORITHM: 040. Travel
13509 AtCoder MATH-AND-ALGORITHM: 039. Snowy Days
13508 AtCoder MATH-AND-ALGORITHM: 038. How Many Guests?
13507 AtCoder MATH-AND-ALGORITHM: 037. Intersection
13506 AtCoder MATH-AND-ALGORITHM: 035. Two Circles
13505 AtCoder MATH-AND-ALGORITHM: 034. Nearest Points
13504 AtCoder MATH-AND-ALGORITHM: 033. Distance
13503 AtCoder MATH-AND-ALGORITHM: 032. Binary Search
13502 AtCoder MATH-AND-ALGORITHM: 031. Taro's Vacation
13501 AtCoder MATH-AND-ALGORITHM: 029. Climb Stairs
13500 AtCoder MATH-AND-ALGORITHM: 027. Sorting
13499 AtCoder MATH-AND-ALGORITHM: 001. Print 5+N
13498 AtCoder M-SOLUTIONS2020: F. Air Safety
13497 AtCoder M-SOLUTIONS2020: E. M's Solution
13496 AtCoder M-SOLUTIONS2020: D. Road to Millionaire
13495 AtCoder M-SOLUTIONS2020: C. Marks
13494 AtCoder M-SOLUTIONS2020: B. Magic 2
13493 AtCoder M-SOLUTIONS2020: A. Kyu in AtCoder
13492 AtCoder M-SOLUTIONS2019: F. Random Tournament
13491 AtCoder M-SOLUTIONS2019: E. Product of Arithmetic Progression
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