Find the Longest Substring Containing Vowels in Even Counts

Sep 15, 2024 · 4 min read · This is the Medium level question of Leetcode Link. Problem Description Given the string s, return the size of the longest substring containing each vowel an even number of times. That is, 'a', 'e', 'i', 'o', and 'u' must appear an even number of tim...