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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)
19055 DMOJ The Cosmic Era P4 - Freedom Appears!
19054 DMOJ The Cosmic Era P3 - Battle Positions
19053 DMOJ The Cosmic Era P2 - Uneven Sand
19052 DMOJ The Cosmic Era P1 - Ship
19051 DMOJ Secret Room
19050 DMOJ Scroll
19049 DMOJ Busy Schedule
19048 DMOJ Spring Coding Bowl '22 P5 - Temple Placement
19047 DMOJ Spring Coding Bowl '22 P4 - Circle Game
19046 DMOJ Spring Coding Bowl '22 P2 - Chicken Strips
19045 DMOJ Spring Coding Bowl '22 P1 - Student Numbers
19044 DMOJ Scansion
19043 DMOJ Super Boggle
19042 DMOJ Sword Art Online Judge 3
19041 DMOJ Sword Art Online Judge 2
19040 DMOJ Sword Art Online Judge
19039 DMOJ Sandwich
19038 DMOJ Salsifa Hall
19037 DMOJ Sales
19036 DMOJ South African Computer Olympiad 2008 Day 1 Problem 3 - Visiting Grandma
19035 DMOJ SAC '22 Code Challenge 5 P5 - Querying Rectangles
19034 DMOJ SAC '22 Code Challenge 5 P4 - Querying Intervals
19033 DMOJ SAC '22 Code Challenge 5 P3 - Querying Presents
19032 DMOJ SAC '22 Code Challenge 5 P2 - Querying Extensions
19031 DMOJ SAC '22 Code Challenge 5 P1 - Querying Plants
19030 DMOJ SAC '22 Code Challenge 5 Junior P5 - English Summative
19029 DMOJ SAC '22 Code Challenge 5 Junior P4 - Course Requirements
19028 DMOJ SAC '22 Code Challenge 5 Junior P3 - Media List
19027 DMOJ SAC '22 Code Challenge 5 Junior P2 - Badminton Scoring
19026 DMOJ SAC '22 Code Challenge 5 Junior P1 - Monkey, Type!
19025 DMOJ SAC '22 Code Challenge 4 P5 - Obligatory Interactive Problem
19024 DMOJ SAC '22 Code Challenge 4 P4 - Obligatory Subarray Problem
19023 DMOJ SAC '22 Code Challenge 4 P3 - Obligatory Math Problem
19022 DMOJ SAC '22 Code Challenge 4 P2 - Obligatory String Problem
19021 DMOJ SAC '22 Code Challenge 4 P1 - Obligatory Car Problem
19020 DMOJ SAC '22 Code Challenge 4 Junior P5 - Obligatory Output Only Problem
19019 DMOJ SAC '22 Code Challenge 4 Junior P4 - Obligatory Permutation Problem
19018 DMOJ SAC '22 Code Challenge 4 Junior P3 - Obligatory Triangle Problem
19017 DMOJ SAC '22 Code Challenge 4 Junior P2 - Obligatory Geometry Problem
19016 DMOJ SAC '22 Code Challenge 4 Junior P1 - Obligatory DeMello Problem
19015 DMOJ SAC '22 Code Challenge 3 P5 - Chat Corrections
19014 DMOJ SAC '22 Code Challenge 3 P4 - Finding Friends
19013 DMOJ SAC '22 Code Challenge 3 P3 - Bob Sort
19012 DMOJ SAC '22 Code Challenge 3 P2 - Unicycle License
19011 DMOJ SAC '22 Code Challenge 3 P1 - Hair Hazards
19010 DMOJ SAC '22 Code Challenge 3 Junior P5 - Normal Encoding
19009 DMOJ SAC '22 Code Challenge 3 Junior P4 - Normal Conversions
19008 DMOJ SAC '22 Code Challenge 3 Junior P3 - Normal Probabilities
19007 DMOJ SAC '22 Code Challenge 3 Junior P2 - Normal Lines
19006 DMOJ SAC '22 Code Challenge 3 Junior P1 - Normal Problem
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