Starlight: List of Problems

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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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ID Problem Name (click to add insights/hints, view summary of insights/hints and similar problems)
121 Codeforces 26E: Multithreading
120 Codeforces 26D: Tickets
119 Codeforces 26C: Parquet
118 Codeforces 26B: Regular Bracket Sequence
117 Codeforces 26A: Almost Prime
116 Codeforces 25E: Test
115 Codeforces 25D: Roads not only in Berland
114 Codeforces 25C: Roads in Berland
113 Codeforces 25B: Phone numbers
112 Codeforces 25A: IQ test
111 Codeforces 24E: Berland collider
110 Codeforces 24D: Broken robot
109 Codeforces 24C: Sequence of points
108 Codeforces 24B: F1 Champions
107 Codeforces 24A: Ring road
106 Codeforces 23E: Tree
105 Codeforces 23D: Tetragon
104 Codeforces 23C: Oranges and Apples
103 Codeforces 23B: Party
102 Codeforces 23A: You're Given a String...
101 Codeforces 22E: Scheme
100 Codeforces 22D: Segments
99 Codeforces 22C: System Administrator
98 Codeforces 22B: Bargaining Table
97 Codeforces 22A: Second Order Statistics
96 Codeforces 21D: Traveling Graph
95 Codeforces 21C: Stripe 2
94 Codeforces 21B: Intersection
93 Codeforces 21A: Jabber ID
92 Codeforces 20C: Dijkstra?
91 Codeforces 20B: Equation
90 Codeforces 20A: BerOS file system
89 Codeforces 19E: Fairy
88 Codeforces 19D: Points
87 Codeforces 19C: Deletion of Repeats
86 Codeforces 19B: Checkout Assistant
85 Codeforces 19A: World Football Cup
84 Codeforces 18E: Flag 2
83 Codeforces 18D: Seller Bob
82 Codeforces 18C: Stripe
81 Codeforces 18B: Platforms
80 Codeforces 18A: Triangle
79 Codeforces 17E: Palisection
78 Codeforces 17D: Notepad
77 Codeforces 17C: Balance
76 Codeforces 17B: Hierarchy
75 Codeforces 17A: Noldbach problem
74 Codeforces 16E: Fish
73 Codeforces 16D: Logging
72 Codeforces 16C: Monitor
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