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Scanner sc = new Scanner(System.in);
int n = sc.nextInt();
ArrayList<ArrayList<Integer> > arr
= new ArrayList<ArrayList<Integer> >();
for (int i = 0; i < n; i++) {
arr.add(new ArrayList<Integer>());
int j = 0;
int d = sc.nextInt();
while(d-->0){
int value = sc.nextInt();
arr.get(i).add(j,value);
j++;
}
}
int q = sc.nextInt();
for (int i = 0; i < q; i++) {
int x = sc.nextInt();
int y = sc.nextInt();
try{
System.out.println(arr.get(x-1).get(y-1));
}
catch(Exception e){
System.out.println("ERROR!");
}}
}
}
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Java Arraylist
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