Starlight: List of Problems

Over 20,000 problems available. AMC 8/10/12 and AIME problems from 2010-2023; USAJMO/USAMO problems from 2002-2023 available. USACO problems from 2014 to 2023 (all divisions). Codeforces, AtCoder, DMOJ problems are added daily around 04:00 AM UTC, which may cause disruptions.

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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)
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
12355	AtCoder DWANGO2016-HONSEN: A. 通勤
12354	AtCoder DWANGO2015-PRELIMS: E. 電波局
12353	AtCoder DWANGO2015-PRELIMS: D. タクシー
12352	AtCoder DWANGO2015-PRELIMS: C. ゲーマーじゃんけん

Problem Name (click to add insights/hints, view summary of insights/hints and similar problems)

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