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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)
17705 DMOJ Fizz Coke
17704 DMOJ Fixing Shirts
17703 DMOJ Firebending
17702 DMOJ Figurines
17701 DMOJ Fibonacci Sequence (Harder)
17700 DMOJ Fibonacci Sequence
17699 DMOJ Facebook Hacker Cup '19 Final Round P6 - Temporal Revision
17698 DMOJ Facebook Hacker Cup '19 Final Round P1 - Strings as a Service
17697 DMOJ Facebook Hacker Cup '17 Qualifying Round P3 - Fighting the Zombie
17696 DMOJ Facebook Hacker Cup '17 Qualifying Round P2 - Lazy Loading
17695 DMOJ Facebook Hacker Cup '17 Qualifying Round P1 - Progress Pie
17694 DMOJ Facebook Hacker Cup '15 Round 3 P4 - Fox Rocks
17693 DMOJ Facebook Hacker Cup '15 Round 3 P3 - Gentrification
17692 DMOJ Facebook Hacker Cup '15 Round 3 P2 - Lunch Scheduling
17691 DMOJ Facebook Hacker Cup '15 Round 3 P1 - Boomerang
17690 DMOJ Facebook Hacker Cup '15 Round 2 P4 - Fox Socks
17689 DMOJ Facebook Hacker Cup '15 Round 2 P3 - Autocomplete Strikes Back
17688 DMOJ Facebook Hacker Cup '15 Round 2 P2 - All Critical
17687 DMOJ Facebook Hacker Cup '15 Round 2 P1 - Lazy Sort
17686 DMOJ Facebook Hacker Cup '15 Round 1 P4 - Corporate Gifting
17685 DMOJ Facebook Hacker Cup '15 Round 1 P3 - Winning at Sports
17684 DMOJ Facebook Hacker Cup '15 Round 1 P2 - Autocomplete
17683 DMOJ Facebook Hacker Cup '15 Round 1 P1 - Homework
17682 DMOJ Facebook Hacker Cup '14 Final Round P4 - Tours
17681 DMOJ Facebook Hacker Cup '14 Final Round P3 - Fortunate Wheels
17680 DMOJ Favorite Numbers
17679 DMOJ The Codefather
17678 DMOJ Fast LCA (Hard)
17677 DMOJ Fast LCA
17676 DMOJ Fast Bit Counting
17675 DMOJ Falling Snowflakes
17674 DMOJ Fair Competition
17673 DMOJ Factors
17672 DMOJ Factorial Calculator
17671 DMOJ Fast Factorial Calculator 3
17670 DMOJ Fast Factorial Calculator 2
17669 DMOJ Fast Factorial Calculator
17668 DMOJ Expected Value
17667 DMOJ Executable Format
17666 DMOJ Exam Prep
17665 DMOJ Evan's Cube
17664 DMOJ ETSR '23 Onsite Round 2 Problem 3 - Trees
17663 DMOJ ETSR '23 Onsite Round 2 Problem 2 - Exponents
17662 DMOJ ETSR '23 Onsite Round 2 Problem 1 - Bracket
17661 DMOJ ETSR '23 Onsite Round 1 Problem 3 - Travel
17660 DMOJ ETSR '23 Onsite Round 1 Problem 2 - Origami
17659 DMOJ ETSR '23 Onsite Round 1 Problem 1 - Arithmetic
17658 DMOJ ETSR '23 Online Round 2 Problem 4 - Queue
17657 DMOJ ETSR '23 Online Round 2 Problem 3 - Stone Game
17656 DMOJ ETSR '23 Online Round 2 Problem 2 - Equation
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