Description
Given a string s, reverse only all the vowels in the string and return it. The vowels are "a", "e", "i", "o", and "u", and they can appear in both lower and upper case.
Examples
Input:
s = "hello"Output:
"holle"Explanation:
e and o are swapped.
Input:
s = "programming"Output:
prigrammongExplanation:
The vowels are o, a, i (from left to right). After reversing their positions, i goes to position 2, a goes to position 6, and o goes to position 10.
Input:
s = "AEIOU"Output:
UOIEAExplanation:
All characters are vowels (uppercase), so reversing the vowels is equivalent to reversing the entire string. A and U swap, E and O swap, while I stays in the middle.
Constraints
- •
1 ≤ s.length ≤ 3 × 10⁵