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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)
17783 DMOJ Google Code Jam '18 Qualification Round Problem A - Saving The Universe Again
17782 DMOJ Google Code Jam '17 Round 1A Problem C - Play the Dragon
17781 DMOJ Google Code Jam '17 Round 1A Problem B - Ratatouille
17780 DMOJ Google Code Jam '17 Qualification Round Problem C - Bathroom Stalls
17779 DMOJ Google Code Jam '17 Qualification Round Problem B - Tidy Numbers
17778 DMOJ Google Code Jam '17 Qualification Round Problem A - Oversized Pancake Flipper
17777 DMOJ Google Code Jam '16 World Finals Problem A - Integeregex
17776 DMOJ Google Code Jam '16 Round 1A Problem C - BFFs
17775 DMOJ Google Code Jam '16 Round 1A Problem B - Rank and File
17774 DMOJ Google Code Jam '16 Round 1A Problem A - The Last Word
17773 DMOJ Google Code Jam '16 Qualification Round Problem B - Revenge of the Pancakes
17772 DMOJ Google Code Jam '16 Qualification Round Problem A - Counting Sheep
17771 DMOJ Google Code Jam '15 Round 1A Problem C - Logging
17770 DMOJ Google Code Jam '15 Round 1A Problem B - Haircut
17769 DMOJ Google Code Jam '15 Round 1A Problem A - Mushroom Monster
17768 DMOJ Google Code Jam '15 Qualification Round Problem D - Ominous Omino
17767 DMOJ Google Code Jam '15 Qualification Round Problem C - Dijkstra
17766 DMOJ Google Code Jam '15 Qualification Round Problem B - Infinite House of Pancakes
17765 DMOJ Google Code Jam '15 Qualification Round Problem A - Standing Ovation
17764 DMOJ Google Code Jam '14 Round 1A Problem B - Full Binary Tree
17763 DMOJ Google Code Jam '14 Round 1A Problem A - Charging Chaos
17762 DMOJ Google Code Jam '14 Qualification Round Problem C - Deceitful War
17761 DMOJ Google Code Jam '14 Qualification Round Problem B - Cookie Clicker Alpha
17760 DMOJ Google Code Jam '14 Qualification Round Problem A - Magic Trick
17759 DMOJ Google Code Jam '13 Round 1A Problem B - Manage your Energy
17758 DMOJ Google Code Jam '13 Round 1A Problem A - Bullseye
17757 DMOJ Google Code Jam '13 Qualification Round Problem D - Fair and Square
17756 DMOJ Google Code Jam '13 Qualification Round Problem C - Treasure
17755 DMOJ Google Code Jam '13 Qualification Round Problem B - Lawnmower
17754 DMOJ Google Code Jam '13 Qualification Round Problem A - Tic-Tac-Toe-Tomek
17753 DMOJ Google Code Jam '12 Round 1A Problem C - Cruise Control
17752 DMOJ Google Code Jam '12 Round 1A Problem B - Kingdom Rush
17751 DMOJ Google Code Jam '12 Round 1A Problem A - Password Problem
17750 DMOJ Google Code Jam '12 Qualification Round Problem D - Hall of Mirrors
17749 DMOJ Google Code Jam '12 Qualification Round Problem C - Recycled Numbers
17748 DMOJ Google Code Jam '12 Qualification Round Problem B - Dancing With the Googlers
17747 DMOJ Google Code Jam '12 Qualification Round Problem A - Speaking in Tongues
17746 DMOJ Google Code Jam '11 Round 1A Problem C - Pseudominion
17745 DMOJ Google Code Jam '11 Round 1A Problem B - The Killer Word
17744 DMOJ Google Code Jam '11 Round 1A Problem A - FreeCell Statistics
17743 DMOJ Google Code Jam '11 Qualification Round Problem D - GoroSort
17742 DMOJ Google Code Jam '11 Qualification Round Problem C - Magicka
17741 DMOJ Google Code Jam '11 Qualification Round Problem B - Candy Splitting
17740 DMOJ Google Code Jam '11 Qualification Round Problem A - Bot Trust
17739 DMOJ Google Code Jam '10 Round 1A Problem C - Number Game
17738 DMOJ Google Code Jam '10 Round 1A Problem B - Make it Smooth
17737 DMOJ Google Code Jam '10 Round 1A Problem A - Rotate
17736 DMOJ Google Code Jam '10 Qualification Round Problem C - Theme Park
17735 DMOJ Google Code Jam '10 Qualification Round Problem B - Snapper Chain
17734 DMOJ Google Code Jam '10 Qualification Round Problem A - Fair Warning
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