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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)
12405 AtCoder FUTURE-FIF-DIGITAL-DAYS-OPEN: C. future_fif_digital_days_open_c
12404 AtCoder FUTURE-FIF-DIGITAL-DAYS-OPEN: B. future_fif_digital_days_open_b
12403 AtCoder FUTURE-FIF-DIGITAL-DAYS-OPEN: A. future_fif_digital_days_open_a
12402 AtCoder FUTURE-FIF-DIGITAL-DAYS: C. Polyomino Connection C
12401 AtCoder FUTURE-FIF-DIGITAL-DAYS: B. Polyomino Connection B
12400 AtCoder FUTURE-FIF-DIGITAL-DAYS: A. Polyomino Connection A
12399 AtCoder FUTURE-CONTEST-2023-FINAL-OPEN: A. Dowsing Rod
12398 AtCoder FUTURE-CONTEST-2022-QUAL: A. Project Leader
12397 AtCoder FUTURE-CONTEST-2022-FINAL-OPEN: A. Code Golf for Robot Vacuums
12396 AtCoder FUTURE-CONTEST-2021-QUAL: A. カードの回収
12395 AtCoder FUTURE-CONTEST-2021-FINAL-OPEN: A. マイニング
12394 AtCoder FUTURE-CONTEST-2020-QUAL: A. ロボットの誘導
12393 AtCoder FUTURE-CONTEST-2020-FINAL: A. 千の木
12392 AtCoder FUTURE-CONTEST-2020-FINAL-2: A. 千の木2
12391 AtCoder FUTURE-CONTEST-2019-QUAL: A. ばらばらロボット
12390 AtCoder FUTURE-CONTEST-2019-FINAL: A. モンスターテイマー
12389 AtCoder FUTURE-CONTEST-2018-QUAL: A. 山型足し算
12388 AtCoder FUTURE-CONTEST-2018-FINAL: A. ツカモの栽培
12387 AtCoder FUTURE-MEETS-YOU-CONTEST-2018-OPEN: A. 増減ソート
12386 AtCoder FUKA5: E. すごろく
12385 AtCoder FUKA5: C. 流れ
12384 AtCoder FUKA5: F. IRU vs SAKI
12383 AtCoder FUKA5: B. すべては1になる
12382 AtCoder FUKA5: G. Graph Cut
12381 AtCoder FUKA5: A. 単位
12380 AtCoder FUKA5: D. Bintree
12379 AtCoder ATC001: C. 高速フーリエ変換
12378 AtCoder EXAWIZARDS2019: F. More Realistic Manhattan Distance
12377 AtCoder EXAWIZARDS2019: E. Black or White
12376 AtCoder EXAWIZARDS2019: D. Modulo Operations
12375 AtCoder EXAWIZARDS2019: C. Snuke the Wizard
12374 AtCoder EXAWIZARDS2019: B. Red or Blue
12373 AtCoder EXAWIZARDS2019: A. Regular Triangle
12372 AtCoder DWACON2017-PRELIMS: E. 偶奇飴分け
12371 AtCoder DWACON2017-PRELIMS: D. ネタだけ食べたい寿司
12370 AtCoder DWACON2017-PRELIMS: C. スキーリフトの相乗り
12369 AtCoder DWACON2017-PRELIMS: B. ニコニコレベル
12368 AtCoder DWACON2017-PRELIMS: A. 動画検索
12367 AtCoder DWACON2017-HONSEN: D. 「ドワンゴからの挑戦状」製作秘話
12366 AtCoder DWACON2017-HONSEN: C. ドワンGo
12365 AtCoder DWACON2017-HONSEN: B. ニワンゴくんの約数
12364 AtCoder DWACON2017-HONSEN: A. 計算ドリル
12363 AtCoder DWANGO2016-PRELIMS: E. 花火
12362 AtCoder DWANGO2016-PRELIMS: D. 庭園
12361 AtCoder DWANGO2016-PRELIMS: C. メンテナンス明け
12360 AtCoder DWANGO2016-PRELIMS: B. 積み鉛筆
12359 AtCoder DWANGO2016-PRELIMS: A. ニコニコ数
12358 AtCoder DWANGO2016-HONSEN: D. 木
12357 AtCoder DWANGO2016-HONSEN: C. 電波塔
12356 AtCoder DWANGO2016-HONSEN: B. 道迷い
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