//Jagged 배열

import java.util.Scanner;

public class Program {

        static Scanner scanner = new Scanner(System.in);

        public static void main(String[] args){

               int [][] jarray;

               int n;

               System.out.println("그룹 수:");

               n = scanner.nextInt();

               jarray = new int[n][];

               int sn;

               for(int i=0;i<jarray.length;i++){

                       System.out.println((i+1)+"번째 그룹 인원 수:");

                       sn = scanner.nextInt();

                       jarray[i] = new int[sn];

               }

               for(int i=0;i<jarray.length;i++){

                       for(int si=0;si<jarray[i].length;si++){

                              System.out.print((i+1)+"그룹 ");

                              System.out.println((si+1)+"번 성적:");

                              jarray[i][si] = scanner.nextInt();

                       }

               }

               for(int[] array: jarray){

                       for(int item:array){

                              System.out.print(item+" ");

                       }

                       System.out.println("");

               }

        }

}

그룹 수:

2

1번째 그룹 인원 수:

3

2번째 그룹 인원 수:

2

1그룹 1번 성적:

10

1그룹 2번 성적:

20

1그룹 3번 성적:

30

2그룹 1번 성적:

40

2그룹 2번 성적:

50

10 20 30

40 50