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);
        StringBuilder reversed = new StringBuilder();
        
        int t = in.nextInt();
        String[] sArr = new String[t];

        for (int i = 0; i < t; i++){
            int n = in.nextInt();
            String o = in.nextLine();
            String s = in.nextLine();
            for(int j = n-1; j >= 0; j--){
                if (s.charAt(j) != ' '){
                    reversed.append(s.charAt(j));
                }
            }
            sArr[i] = reversed.toString();
            reversed.setLength(0);
        }

        for (String outcome:sArr){
            System.out.println(outcome);
        }

        in.close();
    }
}