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)
10701	AtCoder AGC011: F. Train Service Planning
10700	AtCoder AGC011: E. Increasing Numbers
10699	AtCoder AGC011: D. Half Reflector
10698	AtCoder AGC011: C. Squared Graph
10697	AtCoder AGC011: B. Colorful Creatures
10696	AtCoder AGC011: A. Airport Bus
10695	AtCoder AGC010: F. Tree Game
10694	AtCoder AGC010: E. Rearranging
10693	AtCoder AGC010: D. Decrementing
10692	AtCoder AGC010: C. Cleaning
10691	AtCoder AGC010: B. Boxes
10690	AtCoder AGC010: A. Addition
10689	AtCoder AGC009: E. Eternal Average
10688	AtCoder AGC009: D. Uninity
10687	AtCoder AGC009: C. Division into Two
10686	AtCoder AGC009: B. Tournament
10685	AtCoder AGC009: A. Multiple Array
10684	AtCoder AGC008: F. Black Radius
10683	AtCoder AGC008: E. Next or Nextnext
10682	AtCoder AGC008: D. K-th K
10681	AtCoder AGC008: C. Tetromino Tiling
10680	AtCoder AGC008: B. Contiguous Repainting
10679	AtCoder AGC008: A. Simple Calculator
10678	AtCoder AGC007: F. Shik and Copying String
10677	AtCoder AGC007: E. Shik and Travel
10676	AtCoder AGC007: D. Shik and Game
10675	AtCoder AGC007: C. Pushing Balls
10674	AtCoder AGC007: B. Construct Sequences
10673	AtCoder AGC007: A. Shik and Stone
10672	AtCoder AGC006: F. Blackout
10671	AtCoder AGC006: E. Rotate 3x3
10670	AtCoder AGC006: D. Median Pyramid Hard
10669	AtCoder AGC006: C. Rabbit Exercise
10668	AtCoder AGC006: B. Median Pyramid Easy
10667	AtCoder AGC006: A. Prefix and Suffix
10666	AtCoder AGC005: F. Many Easy Problems
10665	AtCoder AGC005: E. Sugigma: The Showdown
10664	AtCoder AGC005: D. ~K Perm Counting
10663	AtCoder AGC005: C. Tree Restoring
10662	AtCoder AGC005: B. Minimum Sum
10661	AtCoder AGC005: A. STring
10660	AtCoder AGC004: F. Namori
10659	AtCoder AGC004: E. Salvage Robots
10658	AtCoder AGC004: D. Teleporter
10657	AtCoder AGC004: C. AND Grid
10656	AtCoder AGC004: B. Colorful Slimes
10655	AtCoder AGC004: A. Divide a Cuboid
10654	AtCoder AGC003: F. Fraction of Fractal
10653	AtCoder AGC003: E. Sequential operations on Sequence
10652	AtCoder AGC003: D. Anticube

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

10701

AtCoder AGC011: F. Train Service Planning

10700

AtCoder AGC011: E. Increasing Numbers

10699

AtCoder AGC011: D. Half Reflector

10698

AtCoder AGC011: C. Squared Graph

10697

AtCoder AGC011: B. Colorful Creatures

10696