题解 | 多组_带空格的字符串_T组形式

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int count = in.nextInt();

        while (count-- > 0) {
        int n = in.nextInt();
        in.nextLine();
        String str = in.nextLine();
        for (int i = n - 1; i >= 0; i--) {
            if(str.charAt(i) != ' ')System.out.print(str.charAt(i));
        }
        System.out.println();
    }
    }
}