题解 | 多组_带空格的字符串_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);
        long num =in.nextLong();
        StringBuilder s =new StringBuilder();
        for(long i=0;i<num;i++){
            long a =in.nextLong();
            in.nextLine();
            String s1 = in.nextLine();
            s1 = s1.replaceAll("\\s","");
            s.append(s1);
            System.out.println(new StringBuilder(s).reverse());
            s.setLength(0);
        }
    }
}