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)
7921 Codeforces 1704B: Luke is a Foodie
7920 Codeforces 1704A: Two 0-1 Sequences
7919 Codeforces 1703G: Good Key, Bad Key
7918 Codeforces 1703F: Yet Another Problem About Pairs Satisfying an Inequality
7917 Codeforces 1703E: Mirror Grid
7916 Codeforces 1703D: Double Strings
7915 Codeforces 1703C: Cypher
7914 Codeforces 1703B: ICPC Balloons
7913 Codeforces 1703A: YES or YES?
7912 Codeforces 1702G2: Passable Paths (hard version)
7911 Codeforces 1702G1: Passable Paths (easy version)
7910 Codeforces 1702F: Equate Multisets
7909 Codeforces 1702E: Split Into Two Sets
7908 Codeforces 1702D: Not a Cheap String
7907 Codeforces 1702C: Train and Queries
7906 Codeforces 1702B: Polycarp Writes a String from Memory
7905 Codeforces 1702A: Round Down the Price
7904 Codeforces 1701F: Points
7903 Codeforces 1701E: Text Editor
7902 Codeforces 1701D: Permutation Restoration
7901 Codeforces 1701C: Schedule Management
7900 Codeforces 1701B: Permutation
7899 Codeforces 1701A: Grass Field
7898 Codeforces 1700F: Puzzle
7897 Codeforces 1700E: Serega the Pirate
7896 Codeforces 1700D: River Locks
7895 Codeforces 1700C: Helping the Nature
7894 Codeforces 1700B: Palindromic Numbers
7893 Codeforces 1700A: Optimal Path
7892 Codeforces 1699E: Three Days Grace
7891 Codeforces 1699D: Almost Triple Deletions
7890 Codeforces 1699C: The Third Problem
7889 Codeforces 1699B: Almost Ternary Matrix
7888 Codeforces 1699A: The Third Three Number Problem
7887 Codeforces 1698G: Long Binary String
7886 Codeforces 1698F: Equal Reversal
7885 Codeforces 1698E: PermutationForces II
7884 Codeforces 1698D: Fixed Point Guessing
7883 Codeforces 1698C: 3SUM Closure
7882 Codeforces 1698B: Rising Sand
7881 Codeforces 1698A: XOR Mixup
7880 Codeforces 1697F: Too Many Constraints
7879 Codeforces 1697E: Coloring
7878 Codeforces 1697D: Guess The String
7877 Codeforces 1697C: awoo's Favorite Problem
7876 Codeforces 1697B: Promo
7875 Codeforces 1697A: Parkway Walk
7874 Codeforces 1696H: Maximum Product?
7873 Codeforces 1696G: Fishingprince Plays With Array Again
7872 Codeforces 1696F: Tree Recovery
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