Java Arraylist - java

The n lines are given. In each line there are zero or more integers. You need to answer a few queries where you need to tell the number located in y^th position of x^th line. 

Input Format

The first line has an integer n. In each of the next n lines there will be an integer d denoting number of integers on that line and then there will be d space-separated integers. In the next line there will be an integer q denoting number of queries. Each query will consist of two integers x and y.

Constraint

• ·         1<=n<=20000
• ·         0<=d<=50000
• ·         1<=q<=1000
• ·         1<=x<=n

Each number will fit in signed integer.
Total number of integers in n lines will not cross 100000.

Output Format
In each line, output the number located in y^th  position of x^th line. If there is no such position, just print "ERROR!"

Sample Input

5

5 41 77 74 22 44

1 12

4 37 34 36 52

0

3 20 22 33

5

1 3

3 4

3 1

4 3

5 5

Sample Output

74

52

37

ERROR!

ERROR!

Explanation

The diagram below explains the queries:

Coding

import java.io.*;

import java.util.*;

public class Solution

 {

    public static void main(String[] args) 

  {

     Scanner in = new Scanner(System.in);

     int n = in.nextInt();

     int d,q,x,y;

     ArrayList[] a = new ArrayList[n];

     for(int i=0;i<n;i++)

    {

        d = in.nextInt();

        a[i] = new ArrayList();

        for(int j=0;j<d;j++)

        { 

            a[i].add(in.nextInt());               

        }

    }

    q=in.nextInt();

    for(int i=0;i<q;i++)

   {

        x=in.nextInt();

        y=in.nextInt();

        try{

            System.out.println(a[x-1].get(y-1));

        } catch(Exception e){

            System.out.println("ERROR!");

        }

    }   

   } 

}