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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)
150 Codeforces 32D: Constellation
149 Codeforces 32C: Flea
148 Codeforces 32B: Borze
147 Codeforces 32A: Reconnaissance
146 Codeforces 31E: TV Game
145 Codeforces 31D: Chocolate
144 Codeforces 31C: Schedule
143 Codeforces 31B: Sysadmin Bob
142 Codeforces 31A: Worms Evolution
141 Codeforces 30E: Tricky and Clever Password
140 Codeforces 30D: King's Problem?
139 Codeforces 30C: Shooting Gallery
138 Codeforces 30B: Codeforces World Finals
137 Codeforces 30A: Accounting
136 Codeforces 29E: Quarrel
135 Codeforces 29D: Ant on the Tree
134 Codeforces 29C: Mail Stamps
133 Codeforces 29B: Traffic Lights
132 Codeforces 29A: Spit Problem
131 Codeforces 28E: DravDe saves the world
130 Codeforces 28D: Don't fear, DravDe is kind
129 Codeforces 28C: Bath Queue
128 Codeforces 28B: pSort
127 Codeforces 28A: Bender Problem
126 Codeforces 27E: Number With The Given Amount Of Divisors
125 Codeforces 27D: Ring Road 2
124 Codeforces 27C: Unordered Subsequence
123 Codeforces 27B: Tournament
122 Codeforces 27A: Next Test
121 Codeforces 26E: Multithreading
120 Codeforces 26D: Tickets
119 Codeforces 26C: Parquet
118 Codeforces 26B: Regular Bracket Sequence
117 Codeforces 26A: Almost Prime
116 Codeforces 25E: Test
115 Codeforces 25D: Roads not only in Berland
114 Codeforces 25C: Roads in Berland
113 Codeforces 25B: Phone numbers
112 Codeforces 25A: IQ test
111 Codeforces 24E: Berland collider
110 Codeforces 24D: Broken robot
109 Codeforces 24C: Sequence of points
108 Codeforces 24B: F1 Champions
107 Codeforces 24A: Ring road
106 Codeforces 23E: Tree
105 Codeforces 23D: Tetragon
104 Codeforces 23C: Oranges and Apples
103 Codeforces 23B: Party
102 Codeforces 23A: You're Given a String...
101 Codeforces 22E: Scheme
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