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)
25309 AtCoder ABC345: E. Colorful Subsequence
25308 AtCoder ABC345: D. Tiling
25307 AtCoder ABC345: C. One Time Swap
25306 AtCoder ABC345: B. Integer Division Returns
25305 AtCoder ABC345: A. Leftrightarrow
25304 AtCoder ABC344: G. Points and Comparison
25303 AtCoder ABC344: F. Earn to Advance
25302 AtCoder ABC344: E. Insert or Erase
25301 AtCoder ABC344: D. String Bags
25300 AtCoder ABC344: C. A+B+C
25299 AtCoder ABC344: B. Delimiter
25298 AtCoder ABC344: A. Spoiler
25297 AtCoder ABC343: G. Compress Strings
25296 AtCoder ABC343: F. Second Largest Query
25295 AtCoder ABC343: E. 7x7x7
25294 AtCoder ABC343: D. Diversity of Scores
25293 AtCoder ABC343: C. 343
25292 AtCoder ABC343: B. Adjacency Matrix
25291 AtCoder ABC343: A. Wrong Answer
25290 AtCoder ABC342: G. Retroactive Range Chmax
25289 AtCoder ABC342: F. Black Jack
25288 AtCoder ABC342: E. Last Train
25287 AtCoder ABC342: D. Square Pair
25286 AtCoder ABC342: C. Many Replacement
25285 AtCoder ABC342: B. Which is ahead?
25284 AtCoder ABC342: A. Yay!
25283 AtCoder ABC341: G. Highest Ratio
25282 AtCoder ABC341: F. Breakdown
25281 AtCoder ABC341: E. Alternating String
25280 AtCoder ABC341: D. Only one of two
25279 AtCoder ABC341: C. Takahashi Gets Lost
25278 AtCoder ABC341: B. Foreign Exchange
25277 AtCoder ABC341: A. Print 341
25276 AtCoder APG4BPYTHON: N. 1.13.関数
25275 AtCoder APG4BPYTHON: M. 1.12.組み込み関数
25274 AtCoder APG4BPYTHON: L. 1.11.文字列
25273 AtCoder APG4BPYTHON: K. 1.10.リスト
25272 AtCoder APG4BPYTHON: J. 1.09.for文・break・continue
25271 AtCoder APG4BPYTHON: I. 1.08.while文
25270 AtCoder APG4BPYTHON: H. 1.07.論理式の値とbool型
25269 AtCoder APG4BPYTHON: G. 1.06.if文・比較演算子・論理演算子
25268 AtCoder APG4BPYTHON: F. 1.05.入力
25267 AtCoder APG4BPYTHON: E. 1.04.変数と型
25266 AtCoder APG4BPYTHON: D. 1.03.四則演算と優先順位
25265 AtCoder APG4BPYTHON: EX1. コードテストと出力の練習
25264 AtCoder APG4BPYTHON: EX2. エラーの修正
25263 AtCoder APG4BPYTHON: EX3. 計算問題
25262 AtCoder APG4BPYTHON: EX4. ◯年は何秒?
25261 AtCoder APG4BPYTHON: EX5. A足すB問題
25260 AtCoder APG4BPYTHON: EX6. 電卓をつくろう
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