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LeetCode 345 Reverse Vowels of a String
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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