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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)
2200 Codeforces 513F1: Scaygerboss
2199 Codeforces 513E2: Subarray Cuts
2198 Codeforces 513E1: Subarray Cuts
2197 Codeforces 513D2: Constrained Tree
2196 Codeforces 513D1: Constrained Tree
2195 Codeforces 513C: Second price auction
2194 Codeforces 513B2: Permutations
2193 Codeforces 513B1: Permutations
2192 Codeforces 513A: Game
2191 Codeforces 512E: Fox And Polygon
2190 Codeforces 512D: Fox And Travelling
2189 Codeforces 510E: Fox And Dinner
2188 Codeforces 510D: Fox And Jumping
2187 Codeforces 510C: Fox And Names
2186 Codeforces 510B: Fox And Two Dots
2185 Codeforces 510A: Fox And Snake
2184 Codeforces 509F: Progress Monitoring
2183 Codeforces 509E: Pretty Song
2182 Codeforces 509D: Restoring Numbers
2181 Codeforces 509C: Sums of Digits
2180 Codeforces 509B: Painting Pebbles
2179 Codeforces 509A: Maximum in Table
2178 Codeforces 508E: Arthur and Brackets
2177 Codeforces 508D: Tanya and Password
2176 Codeforces 508C: Anya and Ghosts
2175 Codeforces 508B: Anton and currency you all know
2174 Codeforces 508A: Pasha and Pixels
2173 Codeforces 507E: Breaking Good
2172 Codeforces 507D: The Maths Lecture
2171 Codeforces 507C: Guess Your Way Out!
2170 Codeforces 507B: Amr and Pins
2169 Codeforces 507A: Amr and Music
2168 Codeforces 506E: Mr. Kitayuta's Gift
2167 Codeforces 506D: Mr. Kitayuta's Colorful Graph
2166 Codeforces 505E: Mr. Kitayuta vs. Bamboos
2165 Codeforces 505D: Mr. Kitayuta's Technology
2164 Codeforces 505C: Mr. Kitayuta, the Treasure Hunter
2163 Codeforces 505B: Mr. Kitayuta's Colorful Graph
2162 Codeforces 505A: Mr. Kitayuta's Gift
2161 Codeforces 504E: Misha and LCP on Tree
2160 Codeforces 504D: Misha and XOR
2159 Codeforces 501E: Misha and Palindrome Degree
2158 Codeforces 501D: Misha and Permutations Summation
2157 Codeforces 501C: Misha and Forest
2156 Codeforces 501B: Misha and Changing Handles
2155 Codeforces 501A: Contest
2154 Codeforces 500G: New Year Running
2153 Codeforces 500F: New Year Shopping
2152 Codeforces 500E: New Year Domino
2151 Codeforces 500D: New Year Santa Network
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