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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)
18155 DMOJ IOI '22 P2 - Prisoner Challenge
18154 DMOJ IOI '22 P1 - Catfish Farm
18153 DMOJ IOI '21 P6 - Bit Shift Registers
18152 DMOJ IOI '21 P5 - Dungeons Game
18151 DMOJ IOI '21 P4 - Mutating DNA
18150 DMOJ IOI '21 P3 - Fountain Parks
18149 DMOJ IOI '21 P2 - Keys
18148 DMOJ IOI '21 P1 - Distributing Candies
18147 DMOJ IOI '20 P6 - Stations
18146 DMOJ IOI '20 P5 - Counting Mushrooms
18145 DMOJ IOI '20 P4 - Packing Biscuits
18144 DMOJ IOI '20 P3 - Carnival Tickets
18143 DMOJ IOI '20 P2 - Connecting Supertrees
18142 DMOJ IOI '20 P1 - Comparing Plants
18141 DMOJ IOI '19 P6 - Sky Walking
18140 DMOJ IOI '19 P5 - Vision Program
18139 DMOJ IOI '19 P4 - Broken Line
18138 DMOJ IOI '19 P3 - Rectangles
18137 DMOJ IOI '19 P2 - Split the Attractions
18136 DMOJ IOI '19 P1 - Arranging Shoes
18135 DMOJ IOI '18 P6 - Meetings
18134 DMOJ IOI '18 P5 - Highway Tolls
18133 DMOJ IOI '18 P4 - Mechanical Doll
18132 DMOJ IOI '18 P3 - Werewolf
18131 DMOJ IOI '18 P2 - Seats
18130 DMOJ IOI '18 P1 - Combo
18129 DMOJ IOI '17 P6 - Ancient Books
18128 DMOJ IOI '17 P5 - Simurgh
18127 DMOJ IOI '17 P4 - The Big Prize
18126 DMOJ IOI '17 P3 - Toy Train
18125 DMOJ IOI '17 P2 - Wiring
18124 DMOJ IOI '17 P1 - Nowruz
18123 DMOJ IOI '16 P6 - Aliens (Standard I/O)
18122 DMOJ IOI '16 P6 - Aliens
18121 DMOJ IOI '16 P5 - Unscrambling a Messy Bug
18120 DMOJ IOI '16 P4 - Paint by Numbers (Standard I/O)
18119 DMOJ IOI '16 P4 - Paint by Numbers
18118 DMOJ IOI '16 P3 - Shortcut (Standard I/O)
18117 DMOJ IOI '16 P3 - Shortcut
18116 DMOJ IOI '16 P2 - Roller Coaster Railroad (Standard I/O)
18115 DMOJ IOI '16 P2 - Roller Coaster Railroad
18114 DMOJ IOI '16 P1 - Detecting Molecules (Standard I/O)
18113 DMOJ IOI '16 P1 - Detecting Molecules
18112 DMOJ IOI '15 P6 - Towns
18111 DMOJ IOI '15 P5 - Sorting (Standard I/O)
18110 DMOJ IOI '15 P5 - Sorting
18109 DMOJ IOI '15 P4 - Horses (Standard I/O)
18108 DMOJ IOI '15 P4 - Horses
18107 DMOJ IOI '15 P3 - Teams (Standard I/O)
18106 DMOJ IOI '15 P3 - Teams
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