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)
4871 Codeforces 1117F: Crisp String
4870 Codeforces 1117E: Decypher the String
4869 Codeforces 1117D: Magic Gems
4868 Codeforces 1117C: Magic Ship
4867 Codeforces 1117B: Emotes
4866 Codeforces 1117A: Best Subsegment
4865 Codeforces 1116D6: Hessenberg matrix
4864 Codeforces 1116D5: Creeper
4863 Codeforces 1116D4: TIE fighter
4862 Codeforces 1116D3: X-wing fighter
4861 Codeforces 1116D2: Pattern of increasing blocks
4860 Codeforces 1116D1: Block diagonal matrix
4859 Codeforces 1116C3: ``Is the number of ones divisible by 3?'' oracle
4858 Codeforces 1116C2: ``Is the bit string periodic?'' oracle
4857 Codeforces 1116C1: Alternating bits oracle
4856 Codeforces 1116B2: Not A, not B or not C?
4855 Codeforces 1116B1: Distinguish three-qubit states
4854 Codeforces 1116A2: Generate equal superposition of four basis states
4853 Codeforces 1116A1: Generate state |00⟩ + |01⟩ + |10⟩
4852 Codeforces 1115U3: Block unitary
4851 Codeforces 1115U2: Chessboard unitary
4850 Codeforces 1115U1: Anti-diagonal unitary
4849 Codeforces 1115G3: Palindrome checker oracle
4848 Codeforces 1115G2: OR oracle
4847 Codeforces 1115G1: AND oracle
4846 Codeforces 1114F: Please, another Queries on Array?
4845 Codeforces 1114E: Arithmetic Progression
4844 Codeforces 1114D: Flood Fill
4843 Codeforces 1114C: Trailing Loves (or L'oeufs?)
4842 Codeforces 1114B: Yet Another Array Partitioning Task
4841 Codeforces 1114A: Got Any Grapes?
4840 Codeforces 1113B: Sasha and Magnetic Machines
4839 Codeforces 1113A: Sasha and His Trip
4838 Codeforces 1111E: Tree
4837 Codeforces 1111D: Destroy the Colony
4836 Codeforces 1111C: Creative Snap
4835 Codeforces 1111B: Average Superhero Gang Power
4834 Codeforces 1111A: Superhero Transformation
4833 Codeforces 1110H: Modest Substrings
4832 Codeforces 1110G: Tree-Tac-Toe
4831 Codeforces 1110F: Nearest Leaf
4830 Codeforces 1110E: Magic Stones
4829 Codeforces 1110D: Jongmah
4828 Codeforces 1110C: Meaningless Operations
4827 Codeforces 1110B: Tape
4826 Codeforces 1110A: Parity
4825 Codeforces 1109F: Sasha and Algorithm of Silence's Sounds
4824 Codeforces 1109E: Sasha and a Very Easy Test
4823 Codeforces 1109D: Sasha and Interesting Fact from Graph Theory
4822 Codeforces 1109C: Sasha and a Patient Friend
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