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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)
16605 DMOJ COCI '21 Contest 2 #1 Kaučuk
16604 DMOJ COCI '21 Contest 1 #5 Volontiranje
16603 DMOJ COCI '21 Contest 1 #4 Set
16602 DMOJ COCI '21 Contest 1 #3 Logičari
16601 DMOJ COCI '21 Contest 1 #2 Kamenčići
16600 DMOJ COCI '21 Contest 1 #1 Ljeto
16599 DMOJ COCI '20 Contest 6 #5 Index
16598 DMOJ COCI '20 Contest 6 #4 Geometrija
16597 DMOJ COCI '20 Contest 6 #3 Anagramistica
16596 DMOJ COCI '20 Contest 6 #2 Alias
16595 DMOJ COCI '20 Contest 6 #1 Bold
16594 DMOJ COCI '20 Contest 5 #5 Sjeckanje
16593 DMOJ COCI '20 Contest 5 #4 Planine
16592 DMOJ COCI '20 Contest 5 #3 Magenta
16591 DMOJ COCI '20 Contest 5 #2 Po
16590 DMOJ COCI '20 Contest 5 #1 Šifra
16589 DMOJ COCI '20 Contest 4 #5 Patkice II
16588 DMOJ COCI '20 Contest 4 #4 Janjetina
16587 DMOJ COCI '20 Contest 4 #3 Hop
16586 DMOJ COCI '20 Contest 4 #2 Vepar
16585 DMOJ COCI '20 Contest 4 #1 Pizza
16584 DMOJ COCI '20 Contest 3 #5 Specijacija
16583 DMOJ COCI '20 Contest 3 #4 Selotejp
16582 DMOJ COCI '20 Contest 3 #3 Sateliti
16581 DMOJ COCI '20 Contest 3 #2 Vlak
16580 DMOJ COCI '20 Contest 3 #1 Knjige
16579 DMOJ COCI '20 Contest 2 #5 Svjetlo
16578 DMOJ COCI '20 Contest 2 #4 Sjekira
16577 DMOJ COCI '20 Contest 2 #3 Euklid
16576 DMOJ COCI '20 Contest 2 #2 Odašiljači
16575 DMOJ COCI '20 Contest 2 #1 Crtanje
16574 DMOJ COCI '20 Contest 1 #5 Tenis
16573 DMOJ COCI '20 Contest 1 #4 Papričice
16572 DMOJ COCI '20 Contest 1 #3 3D Histogram
16571 DMOJ COCI '20 Contest 1 #2 Bajka
16570 DMOJ COCI '20 Contest 1 #1 Patkice
16569 DMOJ COCI '19 Contest 6 #5 Trener
16568 DMOJ COCI '19 Contest 6 #4 Skandi
16567 DMOJ COCI '19 Contest 6 #3 Konstrukcija
16566 DMOJ COCI '19 Contest 6 #2 Birmingham
16565 DMOJ COCI '19 Contest 6 #1 Datum
16564 DMOJ COCI '19 Contest 5 #5 Zapina
16563 DMOJ COCI '19 Contest 5 #4 Putovanje
16562 DMOJ COCI '19 Contest 5 #3 Matching
16561 DMOJ COCI '19 Contest 5 #2 Političari
16560 DMOJ COCI '19 Contest 5 #1 Emacs
16559 DMOJ COCI '19 Contest 4 #5 Nivelle
16558 DMOJ COCI '19 Contest 4 #4 Klasika
16557 DMOJ COCI '19 Contest 4 #3 Holding
16556 DMOJ COCI '19 Contest 4 #2 Spiderman
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