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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)
16655 DMOJ COI '06 #1 Patrik
16654 DMOJ COCI '22 Contest 5 #5 Zastave
16653 DMOJ COCI '22 Contest 5 #4 Slastičarnica
16652 DMOJ COCI '22 Contest 5 #3 Logaritam
16651 DMOJ COCI '22 Contest 5 #2 Diskurs
16650 DMOJ COCI '22 Contest 5 #1 Kalendar
16649 DMOJ COCI '22 Contest 4 #5 Vrsta
16648 DMOJ COCI '22 Contest 4 #4 Mreža
16647 DMOJ COCI '22 Contest 4 #3 Bojanje
16646 DMOJ COCI '22 Contest 4 #2 Zrinka
16645 DMOJ COCI '22 Contest 4 #1 7Krokods
16644 DMOJ COCI '22 Contest 3 #5 Skrivača
16643 DMOJ COCI '22 Contest 3 #4 Bomboni
16642 DMOJ COCI '22 Contest 3 #3 Baltazar
16641 DMOJ COCI '22 Contest 3 #2 Dirigent
16640 DMOJ COCI '22 Contest 3 #1 Estimathon
16639 DMOJ COCI '22 Contest 2 #5 Kruhologija
16638 DMOJ COCI '22 Contest 2 #4 Prijateljice
16637 DMOJ COCI '22 Contest 2 #3 Lampice
16636 DMOJ COCI '22 Contest 2 #2 Ekspert
16635 DMOJ COCI '22 Contest 2 #1 Tramvaji
16634 DMOJ COCI '22 Contest 1 #5 Neboderi
16633 DMOJ COCI '22 Contest 1 #4 Iksevi
16632 DMOJ COCI '22 Contest 1 #3 Berilij
16631 DMOJ COCI '22 Contest 1 #2 Čokolade
16630 DMOJ COCI '22 Contest 1 #1 Desni Klik
16629 DMOJ COCI '21 Contest 6 #5 Superozicija
16628 DMOJ COCI '21 Contest 6 #4 Palindromi
16627 DMOJ COCI '21 Contest 6 #3 Naboj
16626 DMOJ COCI '21 Contest 6 #2 Zemljište
16625 DMOJ COCI '21 Contest 6 #1 Med
16624 DMOJ COCI '21 Contest 5 #5 Usmjeravanje
16623 DMOJ COCI '21 Contest 5 #4 Radio
16622 DMOJ COCI '21 Contest 5 #3 Fliper
16621 DMOJ COCI '21 Contest 5 #2 Dijamant
16620 DMOJ COCI '21 Contest 5 #1 Kemija
16619 DMOJ COCI '21 Contest 4 #5 Šarenlist
16618 DMOJ COCI '21 Contest 4 #4 Parkovi
16617 DMOJ COCI '21 Contest 4 #3 Izbori
16616 DMOJ COCI '21 Contest 4 #2 Autobus
16615 DMOJ COCI '21 Contest 4 #1 Autići
16614 DMOJ COCI '21 Contest 3 #5 Kućice
16613 DMOJ COCI '21 Contest 3 #4 Ekoeko
16612 DMOJ COCI '21 Contest 3 #3 Akcija
16611 DMOJ COCI '21 Contest 3 #2 Cijanobakterije
16610 DMOJ COCI '21 Contest 3 #1 Lampice
16609 DMOJ COCI '21 Contest 2 #5 Osumnjičeni
16608 DMOJ COCI '21 Contest 2 #4 Magneti
16607 DMOJ COCI '21 Contest 2 #3 Hiperkocka
16606 DMOJ COCI '21 Contest 2 #2 Kutije
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