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public static void main(String[] args) {
/* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
Scanner sc=new Scanner(System.in);
List<List<Integer>> listofList=new ArrayList<>();
int n=sc.nextInt();
for(int i=0;i<n;i++){
int d=sc.nextInt();
// System.out.println(d);
List<Integer> list=new ArrayList<>();
for(int j=0;j<d;j++){
// System.out.print(sc.nextInt()+" ");
list.add(sc.nextInt());
}
// System.out.println();
listofList.add(list);
}
int q=sc.nextInt();
for(int l=0;l<q;l++){
int x=sc.nextInt();
int y=sc.nextInt();
try{
System.out.println(listofList.get(x-1).get(y-1));
}catch(Exception e){
System.out.println("ERROR!");
}
}
}
}
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Java Arraylist
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import java.io.; import java.util.;
public class Solution {
}