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public class Solution {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
// Read number of lines
int n = sc.nextInt();
ArrayList<ArrayList<Integer>> list = new ArrayList<>();
// Read each line
for (int i = 0; i < n; i++) {
int d = sc.nextInt(); // number of integers in this line
ArrayList<Integer> line = new ArrayList<>();
for (int j = 0; j < d; j++) {
line.add(sc.nextInt());
}
list.add(line);
}
// Read number of queries
int q = sc.nextInt();
// Process each query
for (int i = 0; i < q; i++) {
int x = sc.nextInt(); // line number
int y = sc.nextInt(); // position in line
// Check if valid indices
if (x <= list.size() && y <= list.get(x - 1).size()) {
System.out.println(list.get(x - 1).get(y - 1));
} else {
System.out.println("ERROR!");
}
}
sc.close();
}
}
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Java Arraylist
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public class Solution { public static void main(String[] args) { Scanner sc = new Scanner(System.in);
}