题解 | 多组_字符串_T组形式

import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int t = in.nextInt();
        while(t>0){
            int n = in.nextInt();
            String str = in.next();
            StringBuilder buff = new StringBuilder();
            while(n>0){
                buff.append( str.charAt(n-1) );
                n--;
            }
            System.out.println(buff.toString());
            t--;
        }
        in.close();
    }

    public static void m1(){
         Scanner in = new Scanner(System.in);
        int t = in.nextInt();
        while(t>0){
            int n = in.nextInt();
            String str = in.next();
            StringBuilder strBuiler =  new StringBuilder(str);
            System.out.println(strBuiler.reverse().toString());
            t--;
        }
        in.close();
    }
}