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)
8021 Codeforces 1721F: Matching Reduction
8020 Codeforces 1721E: Prefix Function Queries
8019 Codeforces 1721D: Maximum AND
8018 Codeforces 1721C: Min-Max Array Transformation
8017 Codeforces 1721B: Deadly Laser
8016 Codeforces 1721A: Image
8015 Codeforces 1720E: Misha and Paintings
8014 Codeforces 1720D2: Xor-Subsequence (hard version)
8013 Codeforces 1720D1: Xor-Subsequence (easy version)
8012 Codeforces 1720C: Corners
8011 Codeforces 1720B: Interesting Sum
8010 Codeforces 1720A: Burenka Plays with Fractions
8009 Codeforces 1719C: Fighting Tournament
8008 Codeforces 1719B: Mathematical Circus
8007 Codeforces 1719A: Chip Game
8006 Codeforces 1718F: Burenka, an Array and Queries
8005 Codeforces 1718E: Impressionism
8004 Codeforces 1718D: Permutation for Burenka
8003 Codeforces 1718C: Tonya and Burenka-179
8002 Codeforces 1718B: Fibonacci Strings
8001 Codeforces 1718A2: Burenka and Traditions (hard version)
8000 Codeforces 1718A1: Burenka and Traditions (easy version)
7999 Codeforces 1717F: Madoka and The First Session
7998 Codeforces 1717E: Madoka and The Best University
7997 Codeforces 1717D: Madoka and The Corruption Scheme
7996 Codeforces 1717C: Madoka and Formal Statement
7995 Codeforces 1717B: Madoka and Underground Competitions
7994 Codeforces 1717A: Madoka and Strange Thoughts
7993 Codeforces 1716F: Bags with Balls
7992 Codeforces 1716E: Swap and Maximum Block
7991 Codeforces 1716D: Chip Move
7990 Codeforces 1716C: Robot in a Hallway
7989 Codeforces 1716B: Permutation Chain
7988 Codeforces 1716A: 2-3 Moves
7987 Codeforces 1715F: Crop Squares
7986 Codeforces 1715E: Long Way Home
7985 Codeforces 1715D: 2+ doors
7984 Codeforces 1715C: Monoblock
7983 Codeforces 1715B: Beautiful Array
7982 Codeforces 1715A: Crossmarket
7981 Codeforces 1714G: Path Prefixes
7980 Codeforces 1714F: Build a Tree and That Is It
7979 Codeforces 1714E: Add Modulo 10
7978 Codeforces 1714D: Color with Occurrences
7977 Codeforces 1714C: Minimum Varied Number
7976 Codeforces 1714B: Remove Prefix
7975 Codeforces 1714A: Everyone Loves to Sleep
7974 Codeforces 1713F: Lost Array
7973 Codeforces 1713E: Cross Swapping
7972 Codeforces 1713D: Tournament Countdown
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