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)
12751	AtCoder JAG2017SUMMER-DAY1: E. ベクトル式
12750	AtCoder JAG2017SUMMER-DAY1: D. くさかべ
12749	AtCoder JAG2017SUMMER-DAY1: C. すごろく
12748	AtCoder JAG2017SUMMER-DAY1: B. リス
12747	AtCoder JAG2017SUMMER-DAY1: A. しりとり
12746	AtCoder JAG2017AUTUMN: K. Conveyor Belt
12745	AtCoder JAG2017AUTUMN: J. Farm Village
12744	AtCoder JAG2017AUTUMN: I. Revenge of the Endless BFS
12743	AtCoder JAG2017AUTUMN: H. Separate String
12742	AtCoder JAG2017AUTUMN: G. Coin Slider
12741	AtCoder JAG2017AUTUMN: F. RPG Maker
12740	AtCoder JAG2017AUTUMN: E. Tree Separator
12739	AtCoder JAG2017AUTUMN: D. Revenge of the Broken Door
12738	AtCoder JAG2017AUTUMN: C. Prime-Factor Prime
12737	AtCoder JAG2017AUTUMN: B. Tournament Chart
12736	AtCoder JAG2017AUTUMN: A. Window
12735	AtCoder JAG2016-DOMESTIC: G. リングと紐
12734	AtCoder JAG2016-DOMESTIC: F. 土地相続
12733	AtCoder JAG2016-DOMESTIC: E. 選挙活動
12732	AtCoder JAG2016-DOMESTIC: D. インビジブル
12731	AtCoder JAG2016-DOMESTIC: C. みさわさんの根付き木
12730	AtCoder JAG2016-DOMESTIC: B. 豪邸と宅配便
12729	AtCoder JAG2016-DOMESTIC: A. 阿吽の呼吸
12728	AtCoder IROHA2019-DAY4: L. ...好きです
12727	AtCoder IROHA2019-DAY4: K. 世界線
12726	AtCoder IROHA2019-DAY4: J. もう、諦めない
12725	AtCoder IROHA2019-DAY4: I. ピンチ
12724	AtCoder IROHA2019-DAY4: H. 永遠に
12723	AtCoder IROHA2019-DAY4: G. 真実の魔法陣
12722	AtCoder IROHA2019-DAY4: F. 道なき道を
12721	AtCoder IROHA2019-DAY4: E. 芽生え
12720	AtCoder IROHA2019-DAY4: D. 揺れる街、増える敵
12719	AtCoder IROHA2019-DAY4: C. 君の力に
12718	AtCoder IROHA2019-DAY4: B. 叫び声
12717	AtCoder IROHA2019-DAY4: A. あるよるのできごと
12716	AtCoder IROHA2019-DAY3: L. デクレッシェンド
12715	AtCoder IROHA2019-DAY3: K. えそらんぐ
12714	AtCoder IROHA2019-DAY3: J. Go to Heaven
12713	AtCoder IROHA2019-DAY3: I. Prime or Not
12712	AtCoder IROHA2019-DAY3: H. 〔経験値〕
12711	AtCoder IROHA2019-DAY3: G. ますまてぃくす・おりんぴっく！
12710	AtCoder IROHA2019-DAY3: F. 闇のカードゲーム
12709	AtCoder IROHA2019-DAY3: E. 「く」
12708	AtCoder IROHA2019-DAY3: D. おにごっこ
12707	AtCoder IROHA2019-DAY3: C. Not Say "NO"
12706	AtCoder IROHA2019-DAY3: B. ゐろはちゃん
12705	AtCoder IROHA2019-DAY3: A. 宇宙人
12704	AtCoder IROHA2019-DAY2: K. 虫取り
12703	AtCoder IROHA2019-DAY2: J. ライ麦畑で待ちながら
12702	AtCoder IROHA2019-DAY2: I. 南極

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

12751

AtCoder JAG2017SUMMER-DAY1: E. ベクトル式

12750

AtCoder JAG2017SUMMER-DAY1: D. くさかべ

12749

AtCoder JAG2017SUMMER-DAY1: C. すごろく

12748

AtCoder JAG2017SUMMER-DAY1: B. リス

12747

AtCoder JAG2017SUMMER-DAY1: A. しりとり

12746