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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)
16455 DMOJ COCI '16 Contest 5 #6 Strelice
16454 DMOJ COCI '16 Contest 5 #5 Poklon
16453 DMOJ COCI '16 Contest 5 #4 Ronald
16452 DMOJ COCI '16 Contest 5 #3 Unija
16451 DMOJ COCI '16 Contest 5 #2 Pareto
16450 DMOJ COCI '16 Contest 5 #1 Tuna
16449 DMOJ COCI '16 Contest 4 #6 Osmosmjerka
16448 DMOJ COCI '16 Contest 4 #5 Rima
16447 DMOJ COCI '16 Contest 4 #4 Rekonstruiraj
16446 DMOJ COCI '16 Contest 4 #3 Kas
16445 DMOJ COCI '16 Contest 4 #2 Kartomat
16444 DMOJ COCI '16 Contest 4 #1 Bridž
16443 DMOJ COCI '16 Contest 3 #6 Meksikanac
16442 DMOJ COCI '16 Contest 3 #5 Zoltan
16441 DMOJ COCI '16 Contest 3 #4 Kvalitetni
16440 DMOJ COCI '16 Contest 3 #3 Kroničan
16439 DMOJ COCI '16 Contest 3 #2 Pohlepko
16438 DMOJ COCI '16 Contest 3 #1 Imena
16437 DMOJ COCI '16 Contest 2 #6 Burza
16436 DMOJ COCI '16 Contest 2 #5 Zamjene
16435 DMOJ COCI '16 Contest 2 #4 Prosječni
16434 DMOJ COCI '16 Contest 2 #3 Nizin
16433 DMOJ COCI '16 Contest 2 #2 Tavan
16432 DMOJ COCI '16 Contest 2 #1 Go
16431 DMOJ COCI '16 Contest 1 #6 Vještica
16430 DMOJ COCI '16 Contest 1 #5 Kralj
16429 DMOJ COCI '16 Contest 1 #4 Mag
16428 DMOJ COCI '16 Contest 1 #3 Cezar
16427 DMOJ COCI '16 Contest 1 #2 Jetpack
16426 DMOJ COCI '16 Contest 1 #1 Tarifa
16425 DMOJ COCI '15 Contest 7 #6 Prokletnik
16424 DMOJ COCI '15 Contest 7 #5 Prosti
16423 DMOJ COCI '15 Contest 7 #4 Otpor
16422 DMOJ COCI '15 Contest 7 #3 Ozljeda
16421 DMOJ COCI '15 Contest 7 #2 Prozor
16420 DMOJ COCI '15 Contest 7 #1 Nizovi
16419 DMOJ COCI '15 Contest 6 #6 San
16418 DMOJ COCI '15 Contest 6 #5 Krumpirko
16417 DMOJ COCI '15 Contest 6 #4 Parovi
16416 DMOJ COCI '15 Contest 6 #3 Pianino
16415 DMOJ COCI '15 Contest 6 #2 Putovanje
16414 DMOJ COCI '15 Contest 6 #1 Bela
16413 DMOJ COCI '15 Contest 5 #6 Podnizovi
16412 DMOJ COCI '15 Contest 5 #5 OOP
16411 DMOJ COCI '15 Contest 5 #4 Poplava
16410 DMOJ COCI '15 Contest 5 #3 Perica
16409 DMOJ COCI '15 Contest 5 #2 Multigram
16408 DMOJ COCI '15 Contest 5 #1 Zamka
16407 DMOJ COCI '15 Contest 4 #6 Endor
16406 DMOJ COCI '15 Contest 4 #5 Galaksija
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