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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)
1200 Codeforces 262A: Roma and Lucky Numbers
1199 Codeforces 261E: Maxim and Calculator
1198 Codeforces 261D: Maxim and Increasing Subsequence
1197 Codeforces 261C: Maxim and Matrix
1196 Codeforces 261B: Maxim and Restaurant
1195 Codeforces 261A: Maxim and Discounts
1194 Codeforces 260E: Dividing Kingdom
1193 Codeforces 260D: Black and White Tree
1192 Codeforces 260C: Balls and Boxes
1191 Codeforces 260B: Ancient Prophesy
1190 Codeforces 260A: Adding Digits
1189 Codeforces 259B: Little Elephant and Magic Square
1188 Codeforces 259A: Little Elephant and Chess
1187 Codeforces 258E: Little Elephant and Tree
1186 Codeforces 258D: Little Elephant and Broken Sorting
1185 Codeforces 258C: Little Elephant and LCM
1184 Codeforces 258B: Little Elephant and Elections
1183 Codeforces 258A: Little Elephant and Bits
1182 Codeforces 257E: Greedy Elevator
1181 Codeforces 257D: Sum
1180 Codeforces 257C: View Angle
1179 Codeforces 257B: Playing Cubes
1178 Codeforces 257A: Sockets
1177 Codeforces 256E: Lucky Arrays
1176 Codeforces 256D: Liars and Serge
1175 Codeforces 255E: Furlo and Rublo and Game
1174 Codeforces 255D: Mr. Bender and Square
1173 Codeforces 255C: Almost Arithmetical Progression
1172 Codeforces 255B: Code Parsing
1171 Codeforces 255A: Greg's Workout
1170 Codeforces 254E: Dormitory
1169 Codeforces 254D: Rats
1168 Codeforces 254C: Anagram
1167 Codeforces 254B: Jury Size
1166 Codeforces 254A: Cards with Numbers
1165 Codeforces 253E: Printer
1164 Codeforces 253D: Table with Letters - 2
1163 Codeforces 253C: Text Editor
1162 Codeforces 253B: Physics Practical
1161 Codeforces 253A: Boys and Girls
1160 Codeforces 252B: Unsorting Array
1159 Codeforces 252A: Little Xor
1158 Codeforces 251E: Tree and Table
1157 Codeforces 251D: Two Sets
1156 Codeforces 251C: Number Transformation
1155 Codeforces 251B: Playing with Permutations
1154 Codeforces 251A: Points on Line
1153 Codeforces 250E: Mad Joe
1152 Codeforces 250D: Building Bridge
1151 Codeforces 250C: Movie Critics
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