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)
851	Codeforces 178C1: Smart Beaver and Resolving Collisions
850	Codeforces 178B3: Greedy Merchants
849	Codeforces 178B2: Greedy Merchants
848	Codeforces 178B1: Greedy Merchants
847	Codeforces 178A3: Educational Game
846	Codeforces 178A2: Educational Game
845	Codeforces 178A1: Educational Game
844	Codeforces 177G2: Fibonacci Strings
843	Codeforces 177G1: Fibonacci Strings
842	Codeforces 177F2: Script Generation
841	Codeforces 177F1: Script Generation
840	Codeforces 177E2: Space Voyage
839	Codeforces 177E1: Space Voyage
838	Codeforces 177D2: Encrypting Messages
837	Codeforces 177D1: Encrypting Messages
836	Codeforces 177C2: Party
835	Codeforces 177C1: Party
834	Codeforces 177B2: Rectangular Game
833	Codeforces 177B1: Rectangular Game
832	Codeforces 177A2: Good Matrix Elements
831	Codeforces 177A1: Good Matrix Elements
830	Codeforces 176E: Archaeology
829	Codeforces 176D: Hyper String
828	Codeforces 176C: Playing with Superglue
827	Codeforces 176B: Word Cut
826	Codeforces 176A: Trading Business
825	Codeforces 175F: Gnomes of Might and Magic
824	Codeforces 175E: Power Defence
823	Codeforces 175D: Plane of Tanks: Duel
822	Codeforces 175C: Geometry Horse
821	Codeforces 175B: Plane of Tanks: Pro
820	Codeforces 175A: Robot Bicorn Attack
819	Codeforces 174C: Range Increments
818	Codeforces 174B: File List
817	Codeforces 174A: Problem About Equation
816	Codeforces 173E: Camping Groups
815	Codeforces 173D: Deputies
814	Codeforces 173C: Spiral Maximum
813	Codeforces 173B: Chamber of Secrets
812	Codeforces 173A: Rock-Paper-Scissors
811	Codeforces 172E: BHTML+BCSS
810	Codeforces 172D: Calendar Reform
809	Codeforces 172C: Bus
808	Codeforces 172B: Pseudorandom Sequence Period
807	Codeforces 172A: Phone Code
806	Codeforces 171H: A polyline
805	Codeforces 171G: Mysterious numbers - 2
804	Codeforces 171F: ucyhf
803	Codeforces 171E: MYSTERIOUS LANGUAGE
802	Codeforces 171D: Broken checker

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

851

Codeforces 178C1: Smart Beaver and Resolving Collisions

850

Codeforces 178B3: Greedy Merchants

849

Codeforces 178B2: Greedy Merchants

848

Codeforces 178B1: Greedy Merchants

847

Codeforces 178A3: Educational Game

846