Leetcode Problem 1456. Maximum Number of Vowels in a Substring of Given Length

1456. Maximum Number of Vowels in a Substring of Given Length

Leetcode Solutions

Sliding Window Approach

  1. Create a set vowels containing all vowel characters: 'a', 'e', 'i', 'o', 'u'.
  2. Initialize max_vowels to 0, which will hold the maximum number of vowels found in any substring of length k.
  3. Initialize current_vowels to 0, which will hold the number of vowels in the current window.
  4. Iterate through the first k characters of s and increment current_vowels for each vowel encountered.
  5. Set max_vowels to current_vowels as the initial maximum.
  6. Iterate through the string s starting from the k-th character to the end:
    • If the character entering the window (s[i]) is a vowel, increment current_vowels.
    • If the character leaving the window (s[i - k]) is a vowel, decrement current_vowels.
    • Update max_vowels with the maximum of max_vowels and current_vowels.
  7. Return max_vowels as the result.
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Brute Force Approach

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