twoDimensional_ArrayList

/************
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.
In each line, output the number located in Yth position of Xth 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!

****************/


import java.util.*;

public class Solution {

    public static void main(String[] args) {
    
        Scanner sc = new Scanner(System.in);        
        ArrayList<ArrayList<Integer>> rows = new ArrayList<>();
        
        int n = sc.nextInt();
        for (int i=0; i<n; i++) {
            ArrayList<Integer> row = new ArrayList<>();
            
            int d = sc.nextInt();
            for (int j=0; j<d; j++) {
                row.add(sc.nextInt());
            }
            rows.add(row); 
        }
        
        int q = sc.nextInt();
        for (int i=0; i<q; i++) {
            int x = sc.nextInt();
            int y = sc.nextInt();
            
            try {
                System.out.println(rows.get(x-1).get(y-1));
            }
            //catch (IndexOutOfBoundsException e) {
            catch (Exception e) {
                System.out.println("ERROR!");
            }
        }       
    }
}