0345.reverse-vowels-of-a-string

345. Reverse Vowels of a String

题目

Write a function that takes a string as input and reverse only the vowels of a string.

Example 1: Given s = "hello", return "holle".

Example 2: Given s = "leetcode", return "leotcede".

Note: The vowels does not include the letter "y".

解题思路

见程序注释