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);

        int t = in.nextInt();
        
        while(t-->0){
            int n = in.nextInt();
            if(in.hasNextLine()){
                in.nextLine();
            }
            String st = in.nextLine();
            StringBuilder s = new StringBuilder(st.replace(" ",""));
            s.reverse();
            System.out.println(s.toString());
        }
    }
}