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)
7051	Codeforces 1543D2: RPD and Rap Sheet (Hard Version)
7050	Codeforces 1543D1: RPD and Rap Sheet (Easy Version)
7049	Codeforces 1543C: Need for Pink Slips
7048	Codeforces 1543B: Customising the Track
7047	Codeforces 1543A: Exciting Bets
7046	Codeforces 1542E2: Abnormal Permutation Pairs (hard version)
7045	Codeforces 1542E1: Abnormal Permutation Pairs (easy version)
7044	Codeforces 1542D: Priority Queue
7043	Codeforces 1542C: Strange Function
7042	Codeforces 1542B: Plus and Multiply
7041	Codeforces 1542A: Odd Set
7040	Codeforces 1541B: Pleasant Pairs
7039	Codeforces 1541A: Pretty Permutations
7038	Codeforces 1540E: Tasty Dishes
7037	Codeforces 1540D: Inverse Inversions
7036	Codeforces 1540C2: Converging Array (Hard Version)
7035	Codeforces 1540C1: Converging Array (Easy Version)
7034	Codeforces 1540B: Tree Array
7033	Codeforces 1540A: Great Graphs
7032	Codeforces 1539F: Strange Array
7031	Codeforces 1539E: Game with Cards
7030	Codeforces 1539D: PriceFixed
7029	Codeforces 1539C: Stable Groups
7028	Codeforces 1539B: Love Song
7027	Codeforces 1539A: Contest Start
7026	Codeforces 1538G: Gift Set
7025	Codeforces 1538F: Interesting Function
7024	Codeforces 1538E: Funny Substrings
7023	Codeforces 1538D: Another Problem About Dividing Numbers
7022	Codeforces 1538C: Number of Pairs
7021	Codeforces 1538B: Friends and Candies
7020	Codeforces 1538A: Stone Game
7019	Codeforces 1537F: Figure Fixing
7018	Codeforces 1537E2: Erase and Extend (Hard Version)
7017	Codeforces 1537E1: Erase and Extend (Easy Version)
7016	Codeforces 1537D: Deleting Divisors
7015	Codeforces 1537C: Challenging Cliffs
7014	Codeforces 1537B: Bad Boy
7013	Codeforces 1537A: Arithmetic Array
7012	Codeforces 1536F: Omkar and Akmar
7011	Codeforces 1536E: Omkar and Forest
7010	Codeforces 1536D: Omkar and Medians
7009	Codeforces 1536C: Diluc and Kaeya
7008	Codeforces 1536B: Prinzessin der Verurteilung
7007	Codeforces 1536A: Omkar and Bad Story
7006	Codeforces 1535F: String Distance
7005	Codeforces 1535E: Gold Transfer
7004	Codeforces 1535D: Playoff Tournament
7003	Codeforces 1535C: Unstable String
7002	Codeforces 1535B: Array Reodering

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

7051

Codeforces 1543D2: RPD and Rap Sheet (Hard Version)

7050

Codeforces 1543D1: RPD and Rap Sheet (Easy Version)

7049

Codeforces 1543C: Need for Pink Slips

7048

Codeforces 1543B: Customising the Track

7047

Codeforces 1543A: Exciting Bets

7046