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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)
2250 Codeforces 525B: Pasha and String
2249 Codeforces 525A: Vitaliy and Pie
2248 Codeforces 524F: And Yet Another Bracket Sequence
2247 Codeforces 524E: Rooks and Rectangles
2246 Codeforces 524D: Social Network
2245 Codeforces 524C: The Art of Dealing with ATM
2244 Codeforces 524B: Фото на память - 2 (round version)
2243 Codeforces 524A: Возможно, вы знаете этих людей?
2242 Codeforces 523D: Statistics of Recompressing Videos
2241 Codeforces 523C: Name Quest
2240 Codeforces 523B: Mean Requests
2239 Codeforces 523A: Rotate, Flip and Zoom
2238 Codeforces 522D: Closest Equals
2237 Codeforces 522C: Chicken or Fish?
2236 Codeforces 522B: Photo to Remember
2235 Codeforces 522A: Reposts
2234 Codeforces 521E: Cycling City
2233 Codeforces 521D: Shop
2232 Codeforces 520E: Pluses everywhere
2231 Codeforces 520D: Cubes
2230 Codeforces 520C: DNA Alignment
2229 Codeforces 520B: Two Buttons
2228 Codeforces 520A: Pangram
2227 Codeforces 519E: A and B and Lecture Rooms
2226 Codeforces 519D: A and B and Interesting Substrings
2225 Codeforces 519C: A and B and Team Training
2224 Codeforces 519B: A and B and Compilation Errors
2223 Codeforces 519A: A and B and Chess
2222 Codeforces 518F: Pasha and Pipe
2221 Codeforces 518E: Arthur and Questions
2220 Codeforces 518D: Ilya and Escalator
2219 Codeforces 518C: Anya and Smartphone
2218 Codeforces 518B: Tanya and Postcard
2217 Codeforces 518A: Vitaly and Strings
2216 Codeforces 516E: Drazil and His Happy Friends
2215 Codeforces 516D: Drazil and Morning Exercise
2214 Codeforces 515E: Drazil and Park
2213 Codeforces 515D: Drazil and Tiles
2212 Codeforces 515C: Drazil and Factorial
2211 Codeforces 515B: Drazil and His Happy Friends
2210 Codeforces 515A: Drazil and Date
2209 Codeforces 514E: Darth Vader and Tree
2208 Codeforces 514D: R2D2 and Droid Army
2207 Codeforces 514C: Watto and Mechanism
2206 Codeforces 514B: Han Solo and Lazer Gun
2205 Codeforces 514A: Chewbaсca and Number
2204 Codeforces 513G3: Inversions problem
2203 Codeforces 513G2: Inversions problem
2202 Codeforces 513G1: Inversions problem
2201 Codeforces 513F2: Scaygerboss
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