LeetCode 345. Reverse Vowels of a String
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public class Solution { public String reverseVowels(String s) { Set<Character> set = new HashSet<Character>(); set.add('a'); set.add('e'); set.add('i'); set.add('o'); set.add('u'); set.add('A'); set.add('E'); set.add('I'); set.add('O'); set.add('U'); StringBuilder sb = new StringBuilder(s); int start = 0; int end = s.length() - 1; boolean fromStart = true; while (start < end) { if (fromStart) { if (set.contains(s.charAt(start))) fromStart = false; else start++; } else if (set.contains(s.charAt(end))) { sb.replace(start, start + 1, String.valueOf(s.charAt(end)));sb.replace(end, end + 1, String.valueOf(s.charAt(start)));start++;end--;fromStart = true; } else end--; } return sb.toString(); }} 0 0
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