判断回文串（hdu 2029）双指针法

import java.util.Scanner;
public class Main{
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        int size = input.nextInt();
        String[] str = new String[size];
        for (int i = 0; i < size; i++) {
            String s = input.next();
            str[i] = s;
        }
        function(str);
    }
    public static void function(String[] str){
        for (int i = 0; i < str.length; i++) {
            int n=0;
            int m= str[i].length()-1;
            boolean loop=false;
            while (n<m){
                if(str[i].charAt(n)==str[i].charAt(m)){
                    loop=true;
                    n++;
                    m--;
                }else{
                    loop=false;
                    break;
                }
            }
            if(loop){
                System.out.println("yes");
            }else {
                System.out.println("no");
            }
        }
    }
}