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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)
16055 DMOJ COCI '06 Contest 3 #2 N-puzzle
16054 DMOJ COCI '06 Contest 3 #1 Patuljci
16053 DMOJ COCI '06 Contest 2 #6 Straža
16052 DMOJ COCI '06 Contest 2 #5 Stol
16051 DMOJ COCI '06 Contest 2 #4 Sjecišta
16050 DMOJ COCI '06 Contest 2 #3 Kolone
16049 DMOJ COCI '06 Contest 2 #2 ABC
16048 DMOJ COCI '06 Contest 2 #1 R2
16047 DMOJ COCI '06 Contest 1 #6 Debug
16046 DMOJ COCI '06 Contest 1 #5 Bond
16045 DMOJ COCI '06 Contest 1 #4 Slikar
16044 DMOJ COCI '06 Contest 1 #3 Okviri
16043 DMOJ COCI '06 Contest 1 #2 Herman
16042 DMOJ COCI '06 Contest 1 #1 Modulo
16041 DMOJ Revenge of the Clocks
16040 DMOJ Clique
16039 DMOJ Rock Climbing
16038 DMOJ Chores
16037 DMOJ Chocolate Bar
16036 DMOJ Cheerio Contest 3 P5 - Train Network
16035 DMOJ Cheerio Contest 3 P4 - Bit Flips
16034 DMOJ Cheerio Contest 3 P3 - Everything Array
16033 DMOJ Cheerio Contest 3 P2 - Double-O-Seven
16032 DMOJ Cheerio Contest 3 P1 - Wet Floor
16031 DMOJ Cheerio Contest 2 P5 - Subsequence Queries
16030 DMOJ Cheerio Contest 2 P4 - Modulus Finding
16029 DMOJ Cheerio Contest 2 P3 - Digits
16028 DMOJ Cheerio Contest 2 P2 - Cereal Boxes
16027 DMOJ Cheerio Contest 2 P1 - Cow Pasture
16026 DMOJ Cheerio Contest 1 S5 - Coin Game
16025 DMOJ Cheerio Contest 1 S4 - Mystery Boxes
16024 DMOJ Cheerio Contest 1 S3 - Stock Trading
16023 DMOJ Cheerio Contest 1 S2 - School Expansion
16022 DMOJ Cheerio Contest 1 S1/J4 - Going to School
16021 DMOJ Cheerio Contest 1 J5 - Arithmetic Sequence
16020 DMOJ Cheerio Contest 1 J3 - Festival
16019 DMOJ Cheerio Contest 1 J2 - Phys Ed Class
16018 DMOJ Cheerio Contest 1 J1 - Pronounceable Words
16017 DMOJ Checker Number
16016 DMOJ Checkerboard Summation (Hard)
16015 DMOJ Checkerboard Summation (Easy)
16014 DMOJ Checkerboard Cut
16013 DMOJ Allen's Segments
16012 DMOJ Champion Contest
16011 DMOJ Expensive Chair Stacking
16010 DMOJ CERC '07 E - Gates of Logic
16009 DMOJ CERC '07 B - Strange Billboard
16008 DMOJ CERC '00 H - Hotline
16007 DMOJ CEOI '22 P6 - Parking
16006 DMOJ CEOI '22 P5 - Measures
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