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)
7221 Codeforces 1578A: Anti-Tetris
7220 Codeforces 1576A: Communication Routing Challenge
7219 Codeforces 1575M: Managing Telephone Poles
7218 Codeforces 1575L: Longest Array Deconstruction
7217 Codeforces 1575K: Knitting Batik
7216 Codeforces 1575J: Jeopardy of Dropped Balls
7215 Codeforces 1575I: Illusions of the Desert
7214 Codeforces 1575H: Holiday Wall Ornaments
7213 Codeforces 1575G: GCD Festival
7212 Codeforces 1575F: Finding Expected Value
7211 Codeforces 1575E: Eye-Pleasing City Park Tour
7210 Codeforces 1575D: Divisible by Twenty-Five
7209 Codeforces 1575C: Cyclic Sum
7208 Codeforces 1575B: Building an Amusement Park
7207 Codeforces 1575A: Another Sorting Problem
7206 Codeforces 1574F: Occurrences
7205 Codeforces 1574E: Coloring
7204 Codeforces 1574D: The Strongest Build
7203 Codeforces 1574C: Slay the Dragon
7202 Codeforces 1574B: Combinatorics Homework
7201 Codeforces 1574A: Regular Bracket Sequences
7200 Codeforces 1573B: Swaps
7199 Codeforces 1573A: Countdown
7198 Codeforces 1572F: Stations
7197 Codeforces 1572E: Polygon
7196 Codeforces 1572D: Bridge Club
7195 Codeforces 1572C: Paint
7194 Codeforces 1572B: Xor of 3
7193 Codeforces 1572A: Book
7192 Codeforces 1571J: Two Railroads
7191 Codeforces 1571I: Physical Examination
7190 Codeforces 1571H: Laser Beams
7189 Codeforces 1571G: A Battle Against a Dragon
7188 Codeforces 1571F: Kotlinforces
7187 Codeforces 1571E: Fix the String
7186 Codeforces 1571D: Sweepstake
7185 Codeforces 1571C: Rhyme
7184 Codeforces 1571B: Epic Novel
7183 Codeforces 1571A: Sequence of Comparisons
7182 Codeforces 1569F: Palindromic Hamiltonian Path
7181 Codeforces 1569E: Playoff Restoration
7180 Codeforces 1569D: Inconvenient Pairs
7179 Codeforces 1569C: Jury Meeting
7178 Codeforces 1569B: Chess Tournament
7177 Codeforces 1569A: Balanced Substring
7176 Codeforces 1567F: One-Four Overload
7175 Codeforces 1567E: Non-Decreasing Dilemma
7174 Codeforces 1567D: Expression Evaluation Error
7173 Codeforces 1567C: Carrying Conundrum
7172 Codeforces 1567B: MEXor Mixup
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