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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)
2400 Codeforces 566G: Max and Min
2399 Codeforces 566F: Clique in the Divisibility Graph
2398 Codeforces 566E: Restoring Map
2397 Codeforces 566D: Restructuring Company
2396 Codeforces 566C: Logistical Questions
2395 Codeforces 566B: Replicating Processes
2394 Codeforces 566A: Matching Names
2393 Codeforces 560B: Gerald is into Art
2392 Codeforces 560A: Currency System in Geraldion
2391 Codeforces 559E: Gerald and Path
2390 Codeforces 559D: Randomizer
2389 Codeforces 559C: Gerald and Giant Chess
2388 Codeforces 559B: Equivalent Strings
2387 Codeforces 559A: Gerald's Hexagon
2386 Codeforces 558E: A Simple Task
2385 Codeforces 558D: Guess Your Way Out! II
2384 Codeforces 558C: Amr and Chemistry
2383 Codeforces 558B: Amr and The Large Array
2382 Codeforces 558A: Lala Land and Apple Trees
2381 Codeforces 557E: Ann and Half-Palindrome
2380 Codeforces 557D: Vitaly and Cycle
2379 Codeforces 557C: Arthur and Table
2378 Codeforces 557B: Pasha and Tea
2377 Codeforces 557A: Ilya and Diplomas
2376 Codeforces 556B: Case of Fake Numbers
2375 Codeforces 556A: Case of the Zeros and Ones
2374 Codeforces 555E: Case of Computer Network
2373 Codeforces 555D: Case of a Top Secret
2372 Codeforces 555C: Case of Chocolate
2371 Codeforces 555B: Case of Fugitive
2370 Codeforces 555A: Case of Matryoshkas
2369 Codeforces 554B: Ohana Cleans Up
2368 Codeforces 554A: Kyoya and Photobooks
2367 Codeforces 553E: Kyoya and Train
2366 Codeforces 553D: Nudist Beach
2365 Codeforces 553C: Love Triangles
2364 Codeforces 553B: Kyoya and Permutation
2363 Codeforces 553A: Kyoya and Colored Balls
2362 Codeforces 552E: Vanya and Brackets
2361 Codeforces 552D: Vanya and Triangles
2360 Codeforces 552C: Vanya and Scales
2359 Codeforces 552B: Vanya and Books
2358 Codeforces 552A: Vanya and Table
2357 Codeforces 551E: GukiZ and GukiZiana
2356 Codeforces 551D: GukiZ and Binary Operations
2355 Codeforces 551C: GukiZ hates Boxes
2354 Codeforces 551B: ZgukistringZ
2353 Codeforces 551A: GukiZ and Contest
2352 Codeforces 550E: Brackets in Implications
2351 Codeforces 550D: Regular Bridge
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