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)
2701	Codeforces 631C: Report
2700	Codeforces 631B: Print Check
2699	Codeforces 631A: Interview
2698	Codeforces 630R: Game
2697	Codeforces 630Q: Pyramids
2696	Codeforces 630P: Area of a Star
2695	Codeforces 630O: Arrow
2694	Codeforces 630N: Forecast
2693	Codeforces 630M: Turn
2692	Codeforces 630L: Cracking the Code
2691	Codeforces 630K: Indivisibility
2690	Codeforces 630J: Divisibility
2689	Codeforces 630I: Parking Lot
2688	Codeforces 630H: Benches
2687	Codeforces 630G: Challenge Pennants
2686	Codeforces 630F: Selection of Personnel
2685	Codeforces 630E: A rectangle
2684	Codeforces 630D: Hexagons!
2683	Codeforces 630C: Lucky Numbers
2682	Codeforces 630B: Moore's Law
2681	Codeforces 630A: Again Twenty Five!
2680	Codeforces 629E: Famil Door and Roads
2679	Codeforces 629D: Babaei and Birthday Cake
2678	Codeforces 629C: Famil Door and Brackets
2677	Codeforces 629B: Far Relative’s Problem
2676	Codeforces 629A: Far Relative’s Birthday Cake
2675	Codeforces 628F: Bear and Fair Set
2674	Codeforces 628E: Zbazi in Zeydabad
2673	Codeforces 628D: Magic Numbers
2672	Codeforces 628C: Bear and String Distance
2671	Codeforces 628B: New Skateboard
2670	Codeforces 628A: Tennis Tournament
2669	Codeforces 627F: Island Puzzle
2668	Codeforces 627E: Orchestra
2667	Codeforces 627D: Preorder Test
2666	Codeforces 627C: Package Delivery
2665	Codeforces 627B: Factory Repairs
2664	Codeforces 627A: XOR Equation
2663	Codeforces 626G: Raffles
2662	Codeforces 626F: Group Projects
2661	Codeforces 626E: Simple Skewness
2660	Codeforces 626D: Jerry's Protest
2659	Codeforces 626C: Block Towers
2658	Codeforces 626B: Cards
2657	Codeforces 626A: Robot Sequence
2656	Codeforces 625E: Frog Fights
2655	Codeforces 625D: Finals in arithmetic
2654	Codeforces 625C: K-special Tables
2653	Codeforces 625B: War of the Corporations
2652	Codeforces 625A: Guest From the Past

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

2701

Codeforces 631C: Report

2700

Codeforces 631B: Print Check

2699

Codeforces 631A: Interview

2698

Codeforces 630R: Game

2697

Codeforces 630Q: Pyramids

2696