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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)
16005 DMOJ CEOI '22 P4 - Drawing
16004 DMOJ CEOI '22 P3 - Prize
16003 DMOJ CEOI '22 P2 - Homework
16002 DMOJ CEOI '22 P1 - Abracadabra
16001 DMOJ CEOI '19 Practice P3 - Tower Defense
16000 DMOJ CEOI '19 Practice P2 - Separator
15999 DMOJ CEOI '19 Practice P1 - Count Squares
15998 DMOJ CEOI '19 P5 - Magic Tree
15997 DMOJ CEOI '19 P4 - Amusement Park
15996 DMOJ CEOI '19 P3 - Cubeword
15995 DMOJ CEOI '19 P2 - Dynamic Diameter
15994 DMOJ CEOI '19 P1 - Building Skyscrapers
15993 DMOJ CEOI '18 P5 - Toys
15992 DMOJ CEOI '18 P4 - Fibonacci Representations
15991 DMOJ CEOI '18 P3 - Lottery
15990 DMOJ CEOI '18 P2 - Global Warming
15989 DMOJ CEOI '18 P1 - Cloud Computing
15988 DMOJ CEOI '17 P6 - Chase
15987 DMOJ CEOI '17 P5 - Palindromic Partitions
15986 DMOJ CEOI '17 P4 - Building Bridges
15985 DMOJ CEOI '17 P3 - Mousetrap
15984 DMOJ CEOI '17 P2 - Sure Bet
15983 DMOJ CEOI '17 P1 - One-Way Streets
15982 DMOJ CEOI '16 P5 - Popeala
15981 DMOJ CEOI '16 P4 - Match
15980 DMOJ CEOI '16 P2 - Kangaroo
15979 DMOJ CEOI '14 P2 - Fangorn
15978 DMOJ CEOI '09 P2 - Harbingers
15977 DMOJ CCOQR '16 - Data Structure
15976 DMOJ CCOQR '16 - Through A Maze Darkly
15975 DMOJ CCOQR '16 - Stupendous Bowties
15974 DMOJ CCO Preparation Test 7 P2 - XOR Path
15973 DMOJ CCO Preparation Test 7 P1 - Game of Stone
15972 DMOJ CCO Preparation Test 6 P3 - HopScotch
15971 DMOJ CCO Preparation Test 6 P2 - An Easy Problem
15970 DMOJ CCO Preparation Test 6 P1 - Bus Routes
15969 DMOJ CCO Preparation Test 5 P4 - Toys
15968 DMOJ CCO Preparation Test 5 P3 - Minimum Cycle
15967 DMOJ CCO Preparation Test 5 P2 - Corporative Network
15966 DMOJ CCO Preparation Test 5 P1 - City Game
15965 DMOJ CCO Preparation Test 4 P3 - Dynamic MST
15964 DMOJ CCO Preparation Test 3 P3 - Arrow
15963 DMOJ CCO Preparation Test 3 P2 - Packing Up
15962 DMOJ CCO Preparation Test 3 P1 - Primitive Pythagorean Pairs
15961 DMOJ CCO Preparation Test 2 P3 - Subsets
15960 DMOJ CCO Preparation Test 2 P2 - Forest Area
15959 DMOJ CCO Preparation Test 2 P1 - Concatenation
15958 DMOJ CCO Preparation Test 1 P3 - K-th Rank Student
15957 DMOJ CCO Preparation Test 1 P2 - Escape Maze
15956 DMOJ CCO Preparation Test 1 P1 - Double Cross
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