Contains Duplicate Easy https://leetcode.com/problems/contains-duplicate/ Hash Set Amazon, Apple Valid Anagram Easy https://leetcode.com/problems/valid-anagram/ Hash ...
"I understand this problem as having an array of N integers as input and a subsequence satisfying specific conditions as output. Given the constraints, if N is up to XX, an O (N^2) approach seems ...
Build the window and start checking the size if greater than that then do make sure to start counting and for each valid window do make sure that its characters window count is increased.
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