Reverse Vowels of a String

Category

Array / String

Checkbox

Difficulty

Easy

Index

Key Ideas

The key idea to solve this problem is to use two pointers to traverse the string from both ends, swapping vowels as they are encountered.

Problem Number

345

Problem Summary

# Reverse Vowels of a String This problem requires reversing the vowels in a given string while keeping the non-vowel characters in their original positions. One key pitfall is to properly handle uppercase and lowercase vowels. Additionally, it is important to handle edge cases such as an empty string or a string with no vowels.

Solution Summary

The best solution to reverse vowels of a string involves using two pointers approach. We start with two pointers, one at the beginning of the string and the other at the end. While the pointers haven't crossed each other, we check if both characters at the pointers are vowels. If they are, we swap them. If one or both characters are not vowels, we move the respective pointer towards the center. We repeat this process until the two pointers cross each other. This solution has a time complexity of O(n), where n is the length of the string, as we only iterate through the string once. It effectively reverses the vowels while leaving the consonants in place.