1839 - Longest Substring Of All Vowels in Order\.

Medium

A string is considered beautiful if it satisfies the following conditions:

• Each of the 5 English vowels ('a', 'e', 'i', 'o', 'u') must appear at least once in it.

• The letters must be sorted in alphabetical order (i.e. all 'a's before 'e's, all 'e's before 'i's, etc.).

For example, strings "aeiou" and "aaaaaaeiiiioou" are considered beautiful , but "uaeio", "aeoiu", and "aaaeeeooo" are not beautiful.

Given a string word consisting of English vowels, return the length of the longest beautiful substring of word. If no such substring exists, return 0.

A substring is a contiguous sequence of characters in a string.

Example 1:

Input: word = "aeiaaioaaaaeiiiiouuuooaauuaeiu"

Output: 13

Explanation: The longest beautiful substring in word is "aaaaeiiiiouuu" of length 13.

Example 2:

Input: word = "aeeeiiiioooauuuaeiou"

Output: 5

Explanation: The longest beautiful substring in word is "aeiou" of length 5.

Example 3:

Input: word = "a"

Output: 0

Explanation: There is no beautiful substring, so return 0.

Constraints:

• <code>1 <= word.length <= 5 * 10⁵</code>

• word consists of characters 'a', 'e', 'i', 'o', and 'u'.