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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)
15205 DMOJ APIO '11 P2 - Find the Path
15204 DMOJ APIO '11 P1 - Table Coloring
15203 DMOJ APIO '10 P3 - Signaling
15202 DMOJ APIO '10 P2 - Patrol
15201 DMOJ APIO '10 P1 - Commando
15200 DMOJ APIO '09 P3 - The Great ATM Robbery
15199 DMOJ APIO '09 P2 - The Siruseri Convention Centre
15198 DMOJ APIO '09 P1 - Digging for Oil
15197 DMOJ APIO '08 P3 - DNA
15196 DMOJ APIO '08 P2 - Roads
15195 DMOJ APIO '07 P3 - Zoo
15194 DMOJ APIO '07 P2 - Backup
15193 DMOJ APIO '07 P1 - Mobiles
15192 DMOJ Another Sorting
15191 DMOJ A Noisy Class
15190 DMOJ Angie and Functions
15189 DMOJ A New Country
15188 DMOJ Andrew Needs Help
15187 DMOJ And Password
15186 DMOJ Troubling Times
15185 DMOJ Adaptive Mechanized Calcium Chlorohypochlorite
15184 DMOJ Alphabet Score
15183 DMOJ A Long Problem
15182 DMOJ Sum of Primes 2
15181 DMOJ Alawn's Problem
15180 DMOJ A Harder Game
15179 DMOJ April Fools' Day Contest 1 P8 - NP-Hard
15178 DMOJ April Fools' Day Contest 1 P7 - Half-Plane Intersection
15177 DMOJ April Fools' Day Contest 1 P6 - April Fools' Day (BOJ Edition)
15176 DMOJ April Fools' Day Contest 1 P5 - Definition
15175 DMOJ April Fools' Day Contest 1 P4 - Choosing Choosily
15174 DMOJ April Fools' Day Contest 1 P3 - Author
15173 DMOJ April Fools' Day Contest 1 P2 - Sample Case
15172 DMOJ April Fools' Day Contest 1 P1 - Sample Case
15171 DMOJ A Digit Problem
15170 DMOJ ACSL '09 Contest 3 Senior - Pinochle
15169 DMOJ ACSL '09 Contest 1 Senior - Bridge
15168 DMOJ ACSL '09 Practice P7 - Cube
15167 DMOJ ACSL '09 Practice P6 - Expression
15166 DMOJ ACSL '09 Practice P5 - Fax
15165 DMOJ ACSL '09 Practice P4 - Rank
15164 DMOJ ACSL '09 Practice P3 - Zeroes
15163 DMOJ ACSL '09 Practice P2 - Cars
15162 DMOJ ACSL '09 Practice P1 - Kansas
15161 DMOJ A Combining Problem
15160 DMOJ A Coin Problem
15159 DMOJ ACM U of T Tryouts C3 G - Office Mates
15158 DMOJ ACM U of T Tryouts C3 F - A Pleasant Stroll
15157 DMOJ ACM U of T Tryouts C3 E - A Brief Expedition
15156 DMOJ ACM U of T Tryouts C3 D - A Frightening Evening
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