Maximum Number of Vowels in a Substring of Given Length
Given a string s and an integer k, return the maximum number of vowel letters in any substring of s with length k.
Vowel letters in English are 'a', 'e', 'i', 'o', and 'u'.
Example 1
Input
s = "abciiidef", k = 3Output
3The substring "iii" contains 3 vowel letters.
Example 2
Input
s = "aeiou", k = 2Output
2Any substring of length 2 contains 2 vowels.
Constraints
- 1 <= s.length <= 10^5
- s consists of lowercase English letters.
- 1 <= k <= s.length