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();
            in.nextLine();
            String s = in.nextLine();
            StringBuilder sBuilder = new StringBuilder();
            for(int i = n-1; i>=0; i--){
                sBuilder.append(s.charAt(i));
            }
            System.out.println(sBuilder.toString());
        }
        in.close();
    }
}