LeetCode [345] Reverse Vowels of a String

 345. Reverse Vowels of a String

Easy

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

Example 1:

Input: "hello"
Output: "holle"

Example 2:

Input: "leetcode"
Output: "leotcede"

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

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class Solution { boolean isVowel(char c){ return c=='a'||c=='e'||c=='i'||c=='o'||c=='u'||c=='A'||c=='E'||c=='I'||c=='O'||c=='U'; } public String reverseVowels(String s) { StringBuilder sb = new StringBuilder(s); int l = 0, r = s.length()-1; while(l<r){ if(!isVowel(sb.charAt(l))) l++; else if(!isVowel(sb.charAt(r))) r--; else{ char t = sb.charAt(l); sb.setCharAt(l, sb.charAt(r)); sb.setCharAt(r, t); l++; r--; } } return sb.toString(); } }