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)
2951	Codeforces 700B: Connecting Universities
2950	Codeforces 700A: As Fast As Possible
2949	Codeforces 699B: One Bomb
2948	Codeforces 699A: Launch of Collider
2947	Codeforces 698F: Coprime Permutation
2946	Codeforces 698E: Cron
2945	Codeforces 698D: Limak and Shooting Points
2944	Codeforces 698C: LRU
2943	Codeforces 698B: Fix a Tree
2942	Codeforces 698A: Vacations
2941	Codeforces 697B: Barnicle
2940	Codeforces 697A: Pineapple Incident
2939	Codeforces 696F: ...Dary!
2938	Codeforces 696E: ...Wait for it...
2937	Codeforces 696D: Legen...
2936	Codeforces 696C: PLEASE
2935	Codeforces 696B: Puzzles
2934	Codeforces 696A: Lorenzo Von Matterhorn
2933	Codeforces 691F: Couple Cover
2932	Codeforces 691E: Xor-sequences
2931	Codeforces 691D: Swaps in Permutation
2930	Codeforces 691C: Exponential notation
2929	Codeforces 691B: s-palindrome
2928	Codeforces 691A: Fashion in Berland
2927	Codeforces 690F3: Tree of Life (hard)
2926	Codeforces 690F2: Tree of Life (medium)
2925	Codeforces 690F1: Tree of Life (easy)
2924	Codeforces 690E2: Photographs (II)
2923	Codeforces 690E1: Photographs (I)
2922	Codeforces 690D3: The Wall (hard)
2921	Codeforces 690D2: The Wall (medium)
2920	Codeforces 690D1: The Wall (easy)
2919	Codeforces 690C3: Brain Network (hard)
2918	Codeforces 690C2: Brain Network (medium)
2917	Codeforces 690C1: Brain Network (easy)
2916	Codeforces 690B3: Recover Polygon (hard)
2915	Codeforces 690B2: Recover Polygon (medium)
2914	Codeforces 690B1: Recover Polygon (easy)
2913	Codeforces 690A3: Collective Mindsets (hard)
2912	Codeforces 690A2: Collective Mindsets (medium)
2911	Codeforces 690A1: Collective Mindsets (easy)
2910	Codeforces 689E: Mike and Geometry Problem
2909	Codeforces 689D: Friends and Subsequences
2908	Codeforces 689C: Mike and Chocolate Thieves
2907	Codeforces 689B: Mike and Shortcuts
2906	Codeforces 689A: Mike and Cellphone
2905	Codeforces 688B: Lovely Palindromes
2904	Codeforces 688A: Opponents
2903	Codeforces 687E: TOF
2902	Codeforces 687D: Dividing Kingdom II

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

2951

Codeforces 700B: Connecting Universities

2950

Codeforces 700A: As Fast As Possible

2949

Codeforces 699B: One Bomb

2948

Codeforces 699A: Launch of Collider

2947

Codeforces 698F: Coprime Permutation

2946