Grokking 75: Top Coding Interview Questions
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Solution: Maximum Number of Vowels in a Substring of Given Length

Problem Statement

Given a string s and an integer k, return the highest number of vowels in any substring of s that is exactly k characters long. Vowels in English are 'a', 'e', 'i', 'o', and 'u'.

Examples

Example 1:

  • Input: s = "azerdii", k = 4
  • Expected Output: 2
  • Justification: The substring "rdii" has two vowels ('i', 'i').

Example 2:

  • Input: s = "abcde", k = 2
  • Expected Output: 1
  • Justification: The substring "ab" contains one vowel ('a').

Example 3:

  • Input: s = "zaeixoyuxyz", k = 7

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