JavaArraylist.java

// https://www.hackerrank.com/challenges/java-arraylist/problem

import helper.InputHelper;

public class JavaArraylist {
 public static void main(String[] args) {
 int length = InputHelper.takeLength();
 int[][] matrix = new int[length][];

 for (int row = 0 ; row < length ; row++) {
 int columns = InputHelper.takeLength();
 matrix[row] = new int[columns];
 matrix[row] = InputHelper.get1DArray(columns);
 }

 int queries = InputHelper.takeLength();
 while (queries-- > 0) {
 int row = InputHelper.takeLength();
 int column = InputHelper.takeLength();

 System.out.println(
 row - 1 < length && column - 1 < matrix[row - 1].length
 ? matrix[row - 1][column - 1]
 : "ERROR!"
 );
 }
 }
}