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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)
16905 DMOJ DMOPC '16 Contest 2 P4 - Zeros
16904 DMOJ DMOPC '16 Contest 2 P3 - Queries
16903 DMOJ DMOPC '16 Contest 2 P2 - Ebola Outbreak
16902 DMOJ DMOPC '16 Contest 2 P1 - Seed Strategy
16901 DMOJ DMOPC '16 Contest 1 P6 - Phantom Child
16900 DMOJ DMOPC '16 Contest 1 P5 - Blood Tubes
16899 DMOJ DMOPC '16 Contest 1 P4 - Tree Appraisal
16898 DMOJ DMOPC '16 Contest 1 P3 - Shoe Shopping
16897 DMOJ DMOPC '16 Contest 1 P2 - Lines
16896 DMOJ DMOPC '16 Contest 1 P1 - A New Chapter
16895 DMOJ DMOPC '16 Contest 1 P0 - C.C. and Cheese-kun
16894 DMOJ DMOPC '15 Contest 7 P6 - A Very Very Original Problem
16893 DMOJ DMOPC '15 Contest 7 P5 - Ariadne's Thread
16892 DMOJ DMOPC '15 Contest 7 P4 - Magic
16891 DMOJ DMOPC '15 Contest 7 P3 - Harbourmaster
16890 DMOJ DMOPC '15 Contest 7 P2 - Not a Wall of Text
16889 DMOJ DMOPC '15 Contest 7 P1 - Kemonomimi Competition
16888 DMOJ DMOPC '15 Contest 6 P6 - Graf Zeppelin
16887 DMOJ DMOPC '15 Contest 6 P5 - A Classic Problem
16886 DMOJ DMOPC '15 Contest 6 P4 - Line Graph
16885 DMOJ DMOPC '15 Contest 6 P3 - Harvest
16884 DMOJ DMOPC '15 Contest 6 P2 - Tilt
16883 DMOJ DMOPC '15 Contest 6 P1 - Double XP Weekend
16882 DMOJ DMOPC '15 Contest 5 P6 - Event Horizon
16881 DMOJ DMOPC '15 Contest 5 P5 - World Line Convergence
16880 DMOJ DMOPC '15 Contest 5 P4 - Steins;Number
16879 DMOJ DMOPC '15 Contest 5 P3 - All Your Base
16878 DMOJ DMOPC '15 Contest 5 P2 - D-Mails
16877 DMOJ DMOPC '15 Contest 5 P1 - Gel Bananas
16876 DMOJ DMOPC '15 Contest 4 P6 - Alarms
16875 DMOJ DMOPC '15 Contest 4 P5 - Scribe
16874 DMOJ DMOPC '15 Contest 4 P4 - Great Sequence
16873 DMOJ DMOPC '15 Contest 4 P3 - Lethal
16872 DMOJ DMOPC '15 Contest 4 P2 - The Big Clock
16871 DMOJ DMOPC '15 Contest 4 P1 - Dictionary
16870 DMOJ DMOPC '15 Contest 3 P6 - Gala
16869 DMOJ DMOPC '15 Contest 3 P5 - Total Annihilation
16868 DMOJ DMOPC '15 Contest 3 P4 - Contagion
16867 DMOJ DMOPC '15 Contest 3 P3 - Dimethylbenzene
16866 DMOJ DMOPC '15 Contest 3 P2 - Cheesecake Distribution
16865 DMOJ DMOPC '15 Contest 3 P1 - Quality Scenes
16864 DMOJ DMOPC '15 Contest 2 P6 - Manhattan Magnets
16863 DMOJ DMOPC '15 Contest 2 P5 - Sysadmin
16862 DMOJ DMOPC '15 Contest 2 P4 - Personal Assistant
16861 DMOJ DMOPC '15 Contest 2 P3 - Origami
16860 DMOJ DMOPC '15 Contest 2 P2 - Admin War
16859 DMOJ DMOPC '15 Contest 2 P1 - Grumpy Dwarf
16858 DMOJ DMOPC '15 Contest 1 P6 - Lelei and Contest
16857 DMOJ DMOPC '15 Contest 1 P5 - Lelei and Dragon Scales
16856 DMOJ DMOPC '15 Contest 1 P4 - Itami and Candy
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