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)
571 Codeforces 118C: Fancy Number
570 Codeforces 118B: Present from Lena
569 Codeforces 118A: String Task
568 Codeforces 117E: Tree or not Tree
567 Codeforces 117D: Not Quick Transformation
566 Codeforces 117C: Cycle
565 Codeforces 117B: Very Interesting Game
564 Codeforces 117A: Elevator
563 Codeforces 116B: Little Pigs and Wolves
562 Codeforces 116A: Tram
561 Codeforces 115E: Linear Kingdom Races
560 Codeforces 115D: Unambiguous Arithmetic Expression
559 Codeforces 115C: Plumber
558 Codeforces 115B: Lawnmower
557 Codeforces 115A: Party
556 Codeforces 114B: PFAST Inc.
555 Codeforces 114A: Cifera
554 Codeforces 113E: Sleeping
553 Codeforces 113D: Museum
552 Codeforces 113C: Double Happiness
551 Codeforces 113B: Petr#
550 Codeforces 113A: Grammar Lessons
549 Codeforces 112B: Petya and Square
548 Codeforces 112A: Petya and Strings
547 Codeforces 111E: Petya and Rectangle
546 Codeforces 111D: Petya and Coloring
545 Codeforces 111C: Petya and Spiders
544 Codeforces 111B: Petya and Divisors
543 Codeforces 111A: Petya and Inequiations
542 Codeforces 110B: Lucky String
541 Codeforces 110A: Nearly Lucky Number
540 Codeforces 109E: Lucky Interval
539 Codeforces 109D: Lucky Sorting
538 Codeforces 109C: Lucky Tree
537 Codeforces 109B: Lucky Probability
536 Codeforces 109A: Lucky Sum of Digits
535 Codeforces 108B: Datatypes
534 Codeforces 108A: Palindromic Times
533 Codeforces 107E: Darts
532 Codeforces 107D: Crime Management
531 Codeforces 107C: Arrangement
530 Codeforces 107B: Basketball Team
529 Codeforces 107A: Dorm Water Supply
528 Codeforces 106E: Space Rescuers
527 Codeforces 106D: Treasure Island
526 Codeforces 106C: Buns
525 Codeforces 106B: Choosing Laptop
524 Codeforces 106A: Card Game
523 Codeforces 105E: Lift and Throw
522 Codeforces 105D: Entertaining Geodetics
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