Leetcode 3306. Count of Substrings Containing Every Vowel and K Consonants II

Count the number of substrings of a given lowercase string that include each vowel (a, e, i, o, u) at least once and contain exactly k consonants. With string length up to 2·10^5, the core challenge is to efficiently enumerate substrings while maintaining vowel coverage and an exact consonant count.

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Leetcode 3306. Count of Substrings Containing Every Vowel and K Consonants II

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