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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)
3050 Codeforces 722B: Verse Pattern
3049 Codeforces 722A: Broken Clock
3048 Codeforces 721E: Road to Home
3047 Codeforces 721D: Maxim and Array
3046 Codeforces 721C: Journey
3045 Codeforces 721B: Passwords
3044 Codeforces 721A: One-dimensional Japanese Crossword
3043 Codeforces 720F: Array Covering
3042 Codeforces 720E: Cipher
3041 Codeforces 720D: Slalom
3040 Codeforces 720C: Homework
3039 Codeforces 720B: Cactusophobia
3038 Codeforces 720A: Closing ceremony
3037 Codeforces 719B: Anatoly and Cockroaches
3036 Codeforces 719A: Vitya in the Countryside
3035 Codeforces 718E: Matvey's Birthday
3034 Codeforces 718D: Andrew and Chemistry
3033 Codeforces 718C: Sasha and Array
3032 Codeforces 718A: Efim and Strange Grade
3031 Codeforces 717I: Cowboy Beblop at his computer
3030 Codeforces 717H: Pokermon League challenge
3029 Codeforces 717G: Underfail
3028 Codeforces 717F: Heroes of Making Magic III
3027 Codeforces 717E: Paint it really, really dark gray
3026 Codeforces 717D: Dexterina’s Lab
3025 Codeforces 717C: Potions Homework
3024 Codeforces 717B: R3D3’s Summer Adventure
3023 Codeforces 717A: Festival Organization
3022 Codeforces 716B: Complete the Word
3021 Codeforces 716A: Crazy Computer
3020 Codeforces 715E: Complete the Permutations
3019 Codeforces 715D: Create a Maze
3018 Codeforces 715C: Digit Tree
3017 Codeforces 715B: Complete The Graph
3016 Codeforces 715A: Plus and Square Root
3015 Codeforces 714B: Filya and Homework
3014 Codeforces 714A: Meeting of Old Friends
3013 Codeforces 713E: Sonya Partymaker
3012 Codeforces 713D: Animals and Puzzle
3011 Codeforces 713C: Sonya and Problem Wihtout a Legend
3010 Codeforces 713B: Searching Rectangles
3009 Codeforces 713A: Sonya and Queries
3008 Codeforces 712E: Memory and Casinos
3007 Codeforces 712D: Memory and Scores
3006 Codeforces 712C: Memory and De-Evolution
3005 Codeforces 712B: Memory and Trident
3004 Codeforces 712A: Memory and Crow
3003 Codeforces 711E: ZS and The Birthday Paradox
3002 Codeforces 711D: Directed Roads
3001 Codeforces 711C: Coloring Trees
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