class Solution {
public void reverseString(char[] s) {
//交换就可以做到原地修改
int len=s.length;
char c;
for(int i=0;i
class Solution {
public void reverseString(char[] s) {
//交换就可以做到原地修改
int len=s.length;
char c;
for(int i=0;i