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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)
16305 DMOJ COCI '12 Contest 6 #6 Bakterije
16304 DMOJ COCI '12 Contest 6 #5 Jedan
16303 DMOJ COCI '12 Contest 6 #4 Burek
16302 DMOJ COCI '12 Contest 6 #3 Dobri
16301 DMOJ COCI '12 Contest 6 #2 Sume
16300 DMOJ COCI '12 Contest 6 #1 Baka
16299 DMOJ COCI '12 Contest 5 #6 Mnogomet
16298 DMOJ COCI '12 Contest 5 #5 Rotiraj
16297 DMOJ COCI '12 Contest 5 #4 Hipercijevi
16296 DMOJ COCI '12 Contest 5 #3 Totem
16295 DMOJ COCI '12 Contest 5 #2 Arhipelag
16294 DMOJ COCI '12 Contest 5 #1 Ljestvica
16293 DMOJ COCI '12 Contest 4 #6 Akvarij
16292 DMOJ COCI '12 Contest 4 #5 Dlakavac
16291 DMOJ COCI '12 Contest 4 #4 Razlika
16290 DMOJ COCI '12 Contest 4 #3 Voyager
16289 DMOJ COCI '12 Contest 4 #2 Esej
16288 DMOJ COCI '12 Contest 4 #1 Orehnjaca
16287 DMOJ COCI '12 Contest 3 #6 Procesor
16286 DMOJ COCI '12 Contest 3 #5 Herkabe
16285 DMOJ COCI '12 Contest 3 #4 Aerodrom
16284 DMOJ COCI '12 Contest 3 #3 Malcolm
16283 DMOJ COCI '12 Contest 3 #2 Poredak
16282 DMOJ COCI '12 Contest 3 #1 Sahovnica
16281 DMOJ COCI '12 Contest 2 #6 Inspektor
16280 DMOJ COCI '12 Contest 2 #5 Informacije
16279 DMOJ COCI '12 Contest 2 #4 Popust
16278 DMOJ COCI '12 Contest 2 #3 Lanci
16277 DMOJ COCI '12 Contest 2 #2 Krizaljka
16276 DMOJ COCI '12 Contest 2 #1 Mortadela
16275 DMOJ COCI '12 Contest 1 #6 Mars
16274 DMOJ COCI '12 Contest 1 #5 Snaga
16273 DMOJ COCI '12 Contest 1 #4 Ljubomora
16272 DMOJ COCI '12 Contest 1 #3 Koncert
16271 DMOJ COCI '12 Contest 1 #2 F7
16270 DMOJ COCI '12 Contest 1 #1 DOM
16269 DMOJ COCI '11 Contest 6 #6 Košare
16268 DMOJ COCI '11 Contest 6 #5 Pastele
16267 DMOJ COCI '11 Contest 6 #4 Rez
16266 DMOJ COCI '11 Contest 6 #3 Zagrade
16265 DMOJ COCI '11 Contest 6 #2 Prozori
16264 DMOJ COCI '11 Contest 6 #1 Jack
16263 DMOJ COCI '11 Contest 5 #6 Popločavanje
16262 DMOJ COCI '11 Contest 5 #5 Blokovi
16261 DMOJ COCI '11 Contest 5 #4 Razbibriga
16260 DMOJ COCI '11 Contest 5 #3 Dna
16259 DMOJ COCI '11 Contest 5 #2 Eko
16258 DMOJ COCI '11 Contest 5 #1 Križaljka
16257 DMOJ COCI '11 Contest 4 #6 Kriptogram
16256 DMOJ COCI '11 Contest 4 #5 Broj
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