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)
6771 Codeforces 1493E: Enormous XOR
6770 Codeforces 1493D: GCD of an Array
6769 Codeforces 1493C: K-beautiful Strings
6768 Codeforces 1493B: Planet Lapituletti
6767 Codeforces 1493A: Anti-knapsack
6766 Codeforces 1492E: Almost Fault-Tolerant Database
6765 Codeforces 1492D: Genius's Gambit
6764 Codeforces 1492C: Maximum width
6763 Codeforces 1492B: Card Deck
6762 Codeforces 1492A: Three swimmers
6761 Codeforces 1491I: Ruler Of The Zoo
6760 Codeforces 1491H: Yuezheng Ling and Dynamic Tree
6759 Codeforces 1491G: Switch and Flip
6758 Codeforces 1491F: Magnets
6757 Codeforces 1491E: Fib-tree
6756 Codeforces 1491D: Zookeeper and The Infinite Zoo
6755 Codeforces 1491C: Pekora and Trampoline
6754 Codeforces 1491B: Minimal Cost
6753 Codeforces 1491A: K-th Largest Value
6752 Codeforces 1490G: Old Floppy Drive
6751 Codeforces 1490F: Equalize the Array
6750 Codeforces 1490E: Accidental Victory
6749 Codeforces 1490D: Permutation Transformation
6748 Codeforces 1490C: Sum of Cubes
6747 Codeforces 1490B: Balanced Remainders
6746 Codeforces 1490A: Dense Array
6745 Codeforces 1488J: Flower Shop
6744 Codeforces 1488I: Demonic Invasion
6743 Codeforces 1488H: Build From Suffixes
6742 Codeforces 1488G: Painting Numbers
6741 Codeforces 1488F: Dogecoin
6740 Codeforces 1488E: Palindromic Doubles
6739 Codeforces 1488D: Problemsolving Marathon
6738 Codeforces 1488C: Two Policemen
6737 Codeforces 1488B: RBS Deletion
6736 Codeforces 1488A: From Zero To Y
6735 Codeforces 1487G: String Counting
6734 Codeforces 1487F: Ones
6733 Codeforces 1487E: Cheap Dinner
6732 Codeforces 1487D: Pythagorean Triples
6731 Codeforces 1487C: Minimum Ties
6730 Codeforces 1487B: Cat Cycle
6729 Codeforces 1487A: Arena
6728 Codeforces 1486F: Pairs of Paths
6727 Codeforces 1486E: Paired Payment
6726 Codeforces 1486D: Max Median
6725 Codeforces 1486C2: Guessing the Greatest (hard version)
6724 Codeforces 1486C1: Guessing the Greatest (easy version)
6723 Codeforces 1486B: Eastern Exhibition
6722 Codeforces 1486A: Shifting Stacks
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