字符串－ leetcode 344. Reverse String

原题链接：Reverse String

题解：

public class Solution {    public String reverseString(String s) {        /*            Time Complexity:O(N)            Space Complexity:O(N)        */        char[] res=s.toCharArray();        for(int i=0,j=res.length-1;i<j;i++,j--){            char temp=res[i];            res[i]=res[j];            res[j]=temp;        }         return new String(res);    }}