Watch 10 video solutions for Find the Longest Substring Containing Vowels in Even Counts, a medium level problem involving Hash Table, String, Bit Manipulation. This walkthrough by NeetCode has 657,697 views views. Want to try solving it yourself? Practice on FleetCode or read the detailed text solution.
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 times.
Example 1:
Input: s = "eleetminicoworoep" Output: 13 Explanation: The longest substring is "leetminicowor" which contains two each of the vowels: e, i and o and zero of the vowels: a and u.
Example 2:
Input: s = "leetcodeisgreat" Output: 5 Explanation: The longest substring is "leetc" which contains two e's.
Example 3:
Input: s = "bcbcbc" Output: 6 Explanation: In this case, the given string "bcbcbc" is the longest because all vowels: a, e, i, o and u appear zero times.
Constraints:
1 <= s.length <= 5 x 10^5s contains only lowercase English letters.