题解 | #字符串反转#

双指针，有点慢
import java.util.*;
public class Main{
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
String n = sc.next();
char[] str = n.toCharArray();
int left=0;
int right = n.length()-1;
char temp;
while(left<right){
temp = str[left];
str[left] = str[right];
str[right] = temp;
left++;
right--;
}
String s = new String(str);
System.out.println(s);
}}