字符串－leetcode 541. Reverse String II

原题链接：Reverse String

题解：

public class Solution {    public String reverseStr(String s, int k) {        /*            Time Complexity:O(N)            Space Complexity:O(N)        */        char[] res=s.toCharArray();        for(int i=0;i<res.length;i+=2*k){            for(int x=i,y=Math.min(i+k-1,res.length-1);x<y;x++,y--){                char temp=res[x];                res[x]=res[y];                res[y]=temp;            }        }        return new String(res);    }}