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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)
2300 Codeforces 538D: Weird Chess
2299 Codeforces 538C: Tourist's Notes
2298 Codeforces 538B: Quasi Binary
2297 Codeforces 538A: Cutting Banner
2296 Codeforces 536E: Tavas on the Path
2295 Codeforces 536D: Tavas in Kansas
2294 Codeforces 535E: Tavas and Pashmaks
2293 Codeforces 535D: Tavas and Malekas
2292 Codeforces 535C: Tavas and Karafs
2291 Codeforces 535B: Tavas and SaDDas
2290 Codeforces 535A: Tavas and Nafas
2289 Codeforces 534F: Simplified Nonogram
2288 Codeforces 534E: Berland Local Positioning System
2287 Codeforces 534D: Handshakes
2286 Codeforces 534C: Polycarpus' Dice
2285 Codeforces 534B: Covered Path
2284 Codeforces 534A: Exam
2283 Codeforces 533F: Encoding
2282 Codeforces 533E: Correcting Mistakes
2281 Codeforces 533D: Landmarks
2280 Codeforces 533C: Board Game
2279 Codeforces 533B: Work Group
2278 Codeforces 533A: Berland Miners
2277 Codeforces 530I: Different variables
2276 Codeforces 530H: Points in triangle
2275 Codeforces 530G: Levenshtein distance
2274 Codeforces 530F: Jumping frogs
2273 Codeforces 530E: Sum and product
2272 Codeforces 530D: Set subtraction
2271 Codeforces 530C: Diophantine equation
2270 Codeforces 530B: String inside out
2269 Codeforces 530A: Quadratic equation
2268 Codeforces 529B: Group Photo 2 (online mirror version)
2267 Codeforces 528E: Triangles 3000
2266 Codeforces 528D: Fuzzy Search
2265 Codeforces 527E: Data Center Drama
2264 Codeforces 527D: Clique Problem
2263 Codeforces 527C: Glass Carving
2262 Codeforces 527B: Error Correct System
2261 Codeforces 527A: Playing with Paper
2260 Codeforces 526G: Spiders Evil Plan
2259 Codeforces 526F: Pudding Monsters
2258 Codeforces 526E: Transmitting Levels
2257 Codeforces 526D: Om Nom and Necklace
2256 Codeforces 526C: Om Nom and Candies
2255 Codeforces 526B: Om Nom and Dark Park
2254 Codeforces 526A: King of Thieves
2253 Codeforces 525E: Anya and Cubes
2252 Codeforces 525D: Arthur and Walls
2251 Codeforces 525C: Ilya and Sticks
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