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)
8721 Codeforces 1839E: Decreasing Game
8720 Codeforces 1839D: Ball Sorting
8719 Codeforces 1839C: Insert Zero and Invert Prefix
8718 Codeforces 1839B: Lamps
8717 Codeforces 1839A: The Good Array
8716 Codeforces 1838F: Stuck Conveyor
8715 Codeforces 1838E: Count Supersequences
8714 Codeforces 1838D: Bracket Walk
8713 Codeforces 1838C: No Prime Differences
8712 Codeforces 1838B: Minimize Permutation Subarrays
8711 Codeforces 1838A: Blackboard List
8710 Codeforces 1837F: Editorial for Two
8709 Codeforces 1837E: Playoff Fixing
8708 Codeforces 1837D: Bracket Coloring
8707 Codeforces 1837C: Best Binary String
8706 Codeforces 1837B: Comparison String
8705 Codeforces 1837A: Grasshopper on a Line
8704 Codeforces 1836B: Astrophysicists
8703 Codeforces 1836A: Destroyer
8702 Codeforces 1835F: Good Graph
8701 Codeforces 1835E: Old Mobile
8700 Codeforces 1835D: Doctor's Brown Hypothesis
8699 Codeforces 1835C: Twin Clusters
8698 Codeforces 1835B: Lottery
8697 Codeforces 1835A: k-th equality
8696 Codeforces 1834F: Typewriter
8695 Codeforces 1834E: MEX of LCM
8694 Codeforces 1834D: Survey in Class
8693 Codeforces 1834C: Game with Reversing
8692 Codeforces 1834B: Maximum Strength
8691 Codeforces 1834A: Unit Array
8690 Codeforces 1833G: Ksyusha and Chinchilla
8689 Codeforces 1833F: Ira and Flamenco
8688 Codeforces 1833E: Round Dance
8687 Codeforces 1833D: Flipper
8686 Codeforces 1833C: Vlad Building Beautiful Array
8685 Codeforces 1833B: Restore the Weather
8684 Codeforces 1833A: Musical Puzzle
8683 Codeforces 1832F: Zombies
8682 Codeforces 1832E: Combinatorics Problem
8681 Codeforces 1832D2: Red-Blue Operations (Hard Version)
8680 Codeforces 1832D1: Red-Blue Operations (Easy Version)
8679 Codeforces 1832C: Contrast Value
8678 Codeforces 1832B: Maximum Sum
8677 Codeforces 1832A: New Palindrome
8676 Codeforces 1831B: Array merging
8675 Codeforces 1831A: Twin Permutations
8674 Codeforces 1830F: The Third Grace
8673 Codeforces 1830E: Bully Sort
8672 Codeforces 1830D: Mex Tree
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