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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)
14255 AtCoder TENKA1-2012-QUALB: A. 孫子算経
14254 AtCoder TENKA1-2012-QUALC: D. ゆうびんやさんのお花畑
14253 AtCoder TENKA1-2012-QUALC: C. 席替え
14252 AtCoder TENKA1-2012-QUALC: B. ロイヤルストレートフラッシュ
14251 AtCoder TDPC: N. 木
14250 AtCoder TDPC: C. トーナメント
14249 AtCoder TDPC: K. ターゲット
14248 AtCoder TDPC: O. 文字列
14247 AtCoder TDPC: F. 準急
14246 AtCoder TDPC: E. 数
14245 AtCoder TDPC: G. 辞書順
14244 AtCoder TDPC: H. ナップザック
14243 AtCoder TDPC: I. イウィ
14242 AtCoder TDPC: M. 家
14241 AtCoder TDPC: S. マス目
14240 AtCoder TDPC: R. グラフ
14239 AtCoder TDPC: B. ゲーム
14238 AtCoder TDPC: T. フィボナッチ
14237 AtCoder TDPC: P. うなぎ
14236 AtCoder TDPC: D. サイコロ
14235 AtCoder TDPC: A. コンテスト
14234 AtCoder TDPC: Q. 連結
14233 AtCoder TDPC: L. 猫
14232 AtCoder TDPC: J. ボール
14231 AtCoder SUMMERFES2018-DIV1: J. 楽しい結界作り (Making Barriers Is Fun)
14230 AtCoder SUMMERFES2018-DIV1: I. うっかり者のニム (Careless Nim)
14229 AtCoder SUMMERFES2018-DIV1: H. 圧縮おみくじ (Compressed Omikuji)
14228 AtCoder SUMMERFES2018-DIV1: G. 屋台衝突 (Food Stall Collision)
14227 AtCoder SUMMERFES2018-DIV1: F. 冪冪ゲーム (Powerful Fever!)
14226 AtCoder SUMMERFES2018-DIV1: E. 石積み (Pyramid Piling)
14225 AtCoder SUMMERFES2018-DIV1: D. 木からパスへ (Tree--->path)
14224 AtCoder SUMMERFES2018-DIV2: C. 整数占い (Uranai Integer)
14223 AtCoder SUMMERFES2018-DIV2: B. 太鼓の名人 (Taiko Expert)
14222 AtCoder SUMMERFES2018-DIV2: A. 夏祭り会議 (Summer Festival Meeting)
14221 AtCoder SUMITRUST2019: F. Interval Running
14220 AtCoder SUMITRUST2019: E. Colorful Hats 2
14219 AtCoder SUMITRUST2019: D. Lucky PIN
14218 AtCoder SUMITRUST2019: C. 100 to 105
14217 AtCoder SUMITRUST2019: B. Tax Rate
14216 AtCoder SUMITRUST2019: A. November 30
14215 AtCoder STAGE0-2021: A. Patrolling
14214 AtCoder SOUNDHOUND2018-SUMMER-QUAL: E. + Graph
14213 AtCoder SOUNDHOUND2018-SUMMER-QUAL: D. Saving Snuuk
14212 AtCoder SOUNDHOUND2018-SUMMER-QUAL: C. Ordinary Beauty
14211 AtCoder SOUNDHOUND2018-SUMMER-QUAL: B. Acrostic
14210 AtCoder SOUNDHOUND2018-SUMMER-QUAL: A. F
14209 AtCoder SOUNDHOUND2018-SUMMER-FINAL: E. Hash Swapping
14208 AtCoder SOUNDHOUND2018-SUMMER-FINAL: D. Propagating Edges
14207 AtCoder SOUNDHOUND2018-SUMMER-FINAL: C. Not Too Close
14206 AtCoder SOUNDHOUND2018-SUMMER-FINAL: B. Neutralize
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