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)
3921 Codeforces 919C: Seat Arrangements
3920 Codeforces 919B: Perfect Number
3919 Codeforces 919A: Supermarket
3918 Codeforces 918B: Radio Station
3917 Codeforces 918A: Eleven
3916 Codeforces 917E: Upside Down
3915 Codeforces 917D: Stranger Trees
3914 Codeforces 917C: Pollywog
3913 Codeforces 917B: MADMAX
3912 Codeforces 917A: The Monster
3911 Codeforces 916E: Jamie and Tree
3910 Codeforces 916D: Jamie and To-do List
3909 Codeforces 916C: Jamie and Interesting Graph
3908 Codeforces 916B: Jamie and Binary Sequence (changed after round)
3907 Codeforces 916A: Jamie and Alarm Snooze
3906 Codeforces 915G: Coprime Arrays
3905 Codeforces 915F: Imbalance Value of a Tree
3904 Codeforces 915E: Physical Education Lessons
3903 Codeforces 915D: Almost Acyclic Graph
3902 Codeforces 915C: Permute Digits
3901 Codeforces 915B: Browser
3900 Codeforces 915A: Garden
3899 Codeforces 914H: Ember and Storm's Tree Game
3898 Codeforces 914G: Sum the Fibonacci
3897 Codeforces 914F: Substrings in a String
3896 Codeforces 914E: Palindromes in a Tree
3895 Codeforces 914D: Bash and a Tough Math Puzzle
3894 Codeforces 914C: Travelling Salesman and Special Numbers
3893 Codeforces 914B: Conan and Agasa play a Card Game
3892 Codeforces 914A: Perfect Squares
3891 Codeforces 913H: Don't Exceed
3890 Codeforces 913G: Power Substring
3889 Codeforces 913F: Strongly Connected Tournament
3888 Codeforces 913E: Logical Expression
3887 Codeforces 913D: Too Easy Problems
3886 Codeforces 913C: Party Lemonade
3885 Codeforces 913B: Christmas Spruce
3884 Codeforces 913A: Modular Exponentiation
3883 Codeforces 912E: Prime Gift
3882 Codeforces 912D: Fishes
3881 Codeforces 912C: Perun, Ult!
3880 Codeforces 912B: New Year's Eve
3879 Codeforces 912A: Tricky Alchemy
3878 Codeforces 911G: Mass Change Queries
3877 Codeforces 911F: Tree Destruction
3876 Codeforces 911E: Stack Sorting
3875 Codeforces 911D: Inversion Counting
3874 Codeforces 911C: Three Garlands
3873 Codeforces 911B: Two Cakes
3872 Codeforces 911A: Nearest Minimums
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