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)
7701	Codeforces 1666L: Labyrinth
7700	Codeforces 1666K: Kingdom Partition
7699	Codeforces 1666J: Job Lookup
7698	Codeforces 1666I: Interactive Treasure Hunt
7697	Codeforces 1666H: Heroes of Might
7696	Codeforces 1666G: Global Warming
7695	Codeforces 1666F: Fancy Stack
7694	Codeforces 1666E: Even Split
7693	Codeforces 1666D: Deletive Editing
7692	Codeforces 1666C: Connect the Points
7691	Codeforces 1666B: Budget Distribution
7690	Codeforces 1666A: Admissible Map
7689	Codeforces 1665E: MinimizOR
7688	Codeforces 1665D: GCD Guess
7687	Codeforces 1665C: Tree Infection
7686	Codeforces 1665B: Array Cloning Technique
7685	Codeforces 1665A: GCD vs LCM
7684	Codeforces 1663H: Cross-Language Program
7683	Codeforces 1663G: Six Characters
7682	Codeforces 1663F: In Every Generation...
7681	Codeforces 1663E: Are You Safe?
7680	Codeforces 1663D: Is it rated - 3
7679	Codeforces 1663C: Pōja Verdon
7678	Codeforces 1663B: Mike's Sequence
7677	Codeforces 1663A: Who Tested?
7676	Codeforces 1662O: Circular Maze
7675	Codeforces 1662N: Drone Photo
7674	Codeforces 1662M: Bottle Arrangements
7673	Codeforces 1662L: Il Derby della Madonnina
7672	Codeforces 1662K: Pandemic Restrictions
7671	Codeforces 1662J: Training Camp
7670	Codeforces 1662I: Ice Cream Shop
7669	Codeforces 1662H: Boundary
7668	Codeforces 1662G: Gastronomic Event
7667	Codeforces 1662F: Antennas
7666	Codeforces 1662E: Round Table
7665	Codeforces 1662D: Evolution of Weasels
7664	Codeforces 1662C: European Trip
7663	Codeforces 1662B: Toys
7662	Codeforces 1662A: Organizing SWERC
7661	Codeforces 1661F: Teleporters
7660	Codeforces 1661E: Narrow Components
7659	Codeforces 1661D: Progressions Covering
7658	Codeforces 1661C: Water the Trees
7657	Codeforces 1661B: Getting Zero
7656	Codeforces 1661A: Array Balancing
7655	Codeforces 1660F2: Promising String (hard version)
7654	Codeforces 1660F1: Promising String (easy version)
7653	Codeforces 1660E: Matrix and Shifts
7652	Codeforces 1660D: Maximum Product Strikes Back

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

7701

Codeforces 1666L: Labyrinth

7700

Codeforces 1666K: Kingdom Partition

7699

Codeforces 1666J: Job Lookup

7698

Codeforces 1666I: Interactive Treasure Hunt

7697

Codeforces 1666H: Heroes of Might

7696