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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)
13055 AtCoder JOISC2007: anagram. アナグラム (Anagram)
13054 AtCoder JOIOPEN2023: C. 庭園 (Garden)
13053 AtCoder JOIOPEN2023: B. セルオートマトン (Cell Automaton)
13052 AtCoder JOIOPEN2023: A. 古代の機械 2 (Ancient Machine 2)
13051 AtCoder JOIOPEN2022: C. 通学路 (School Road)
13050 AtCoder JOIOPEN2022: B. キリン (Giraffes)
13049 AtCoder JOIOPEN2022: A. シーソー (Seesaw)
13048 AtCoder JOIGSP2023: H. 最後の戦い (The Last Battle)
13047 AtCoder JOIGSP2023: G. ビ太郎の旅 (Bitaro's Travel)
13046 AtCoder JOIGSP2023: F. 白色光 (White Light)
13045 AtCoder JOIGSP2023: E. スマートフォン (Smartphone)
13044 AtCoder JOIGSP2023: D. ベルトコンベア (Belt Conveyor)
13043 AtCoder JOIGSP2023: C. 議会 (Council)
13042 AtCoder JOIGSP2023: B. テレポーター (Teleporter)
13041 AtCoder JOIGSP2023: A. ロケット打ち上げ (Rocket Launching)
13040 AtCoder JOIGSC2022: H. 復興事業 (Reconstruction Project)
13039 AtCoder JOIGSC2022: G. 一流の団子職人 (Super Dango Maker)
13038 AtCoder JOIGSC2022: F. 空港 (Airport)
13037 AtCoder JOIGSC2022: E. メロンの出荷 (Melons)
13036 AtCoder JOIGSC2022: D. コピー & ペースト 3 (Copy and Paste 3)
13035 AtCoder JOIGSC2022: C. チーム戦 (Team Contest)
13034 AtCoder JOIGSC2022: B. JOIG ツアー (JOIG Tour)
13033 AtCoder JOIGSC2022: A. リレー競技 (Relay)
13032 AtCoder JOIG2023-OPEN: F. タイピング大会 (Typing Contest)
13031 AtCoder JOIG2023-OPEN: E. 運河 (Canal)
13030 AtCoder JOIG2023-OPEN: D. コイン集め 2 (Coin Collecting 2)
13029 AtCoder JOIG2023-OPEN: C. 鐘 (Bell)
13028 AtCoder JOIG2023-OPEN: B. 絶対階差数列 (Sequence of Absolute Differences)
13027 AtCoder JOIG2023-OPEN: A. 末尾の文字 (Last Letter)
13026 AtCoder JOIG2022-OPEN: F. タクシー 2 (Taxis 2)
13025 AtCoder JOIG2022-OPEN: E. エゴイ展 (EGOI Exhibition)
13024 AtCoder JOIG2022-OPEN: D. いちご 2 (Strawberry 2)
13023 AtCoder JOIG2022-OPEN: C. 投票 (Voting)
13022 AtCoder JOIG2022-OPEN: B. 掛け算 (Multiplication)
13021 AtCoder JOIG2022-OPEN: A. ピアノコンクール (Piano Competition)
13020 AtCoder JOIG2021-OPEN: F. デジタルアート (Digital Art)
13019 AtCoder JOIG2021-OPEN: E. パレード (Parade)
13018 AtCoder JOIG2021-OPEN: D. 展覧会 2 (Exhibition 2)
13017 AtCoder JOIG2021-OPEN: C. イルミネーション 2 (Illumination 2)
13016 AtCoder JOIG2021-OPEN: B. 巻物 (Scroll)
13015 AtCoder JOIG2021-OPEN: A. 金平糖 (Konpeito)
13014 AtCoder JOI2023HO: E. 現代的な機械 (Modern Machine)
13013 AtCoder JOI2023HO: D. キャットエクササイズ (Cat Exercise)
13012 AtCoder JOI2023HO: C. 迷路 (Maze)
13011 AtCoder JOI2023HO: B. 宣伝 2 (Advertisement 2)
13010 AtCoder JOI2023HO: A. 碁石ならべ 2 (Stone Arranging 2)
13009 AtCoder JOI2023YO2: E. 日本沈没 2 (Japan Sinks 2)
13008 AtCoder JOI2023YO2: D. 貨物列車 (Freight Train)
13007 AtCoder JOI2023YO2: C. 塗りつぶし (Painting)
13006 AtCoder JOI2023YO2: B. ジョイ四人組 (JOI04)
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