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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".
思路：
左右双指针，遇到元音后停止，二者交换，之后继续各自前进，直至双指针相遇为止。
解法：
1 import java.util.Set; 2 3 public class Solution 4 { 5 public String reverseVowels(String s) 6 { 7 Set<Character> set = new HashSet<>(); 8 char[] vowelArray = {‘a‘, ‘e‘, ‘i‘, ‘o‘, ‘u‘, ‘A‘, ‘E‘, ‘I‘, ‘O‘, ‘U‘}; 9 char[] sArray = s.toCharArray(); 10 11 for(int i = 0; i < vowelArray.length; i++) 12 set.add(vowelArray[i]); 13 14 int left = 0; 15 int right = sArray.length - 1; 16 17 while(left < right) 18 { 19 while((!set.contains(sArray[left])) && (left < right)) 20 left++; 21 while((!set.contains(sArray[right])) && (left < right)) 22 right++; 23 24 if(set.contains(sArray[left]) && set.contains(sArray[right])) 25 { 26 char temp = sArray[left]; 27 sArray[left] = sArray[right]; 28 sArray[right] = temp; 29 left++; 30 right--; 31 } 32 } 33 34 return String.valueOf(sArray); 35 } 36 }
LeetCode 345 Reverse Vowels of a String
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原文地址：http://www.cnblogs.com/wood-python/p/5837139.html
