Day 11: 2D Arrays In Java | 30 Days Of Code | Hackerrank Programming Solutions

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Link for the ProblemDay 11: 2D Arrays – Hacker Rank Solution

Day 11: 2D Arrays – Hacker Rank Solution

Problem:

Objective
Today, we are building on our knowledge of arrays by adding another dimension. Check out the Tutorial tab for learning materials and an instructional video.

Context
Given a  2D Array, :

1 1 1 0 0 0
0 1 0 0 0 0
1 1 1 0 0 0
0 0 0 0 0 0
0 0 0 0 0 0
0 0 0 0 0 0

We define an hourglass in  to be a subset of values with indices falling in this pattern in ‘s graphical representation:

a b c
  d
e f g

There are  hourglasses in , and an hourglass sum is the sum of an hourglass’ values.

Task
Calculate the hourglass sum for every hourglass in , then print the maximum hourglass sum.

Example

In the array shown above, the maximum hourglass sum is  for the hourglass in the top left corner.

Input Format

There are  lines of input, where each line contains  space-separated integers that describe the 2D Array .

Constraints

Output Format

Print the maximum hourglass sum in .

Sample Input

1 1 1 0 0 0
0 1 0 0 0 0
1 1 1 0 0 0
0 0 2 4 4 0
0 0 0 2 0 0
0 0 1 2 4 0

Sample Output

19

Explanation

 contains the following hourglasses:

1 1 1   1 1 0   1 0 0   0 0 0
  1       0       0       0
1 1 1   1 1 0   1 0 0   0 0 0

0 1 0   1 0 0   0 0 0   0 0 0
  1       1       0       0
0 0 2   0 2 4   2 4 4   4 4 0

1 1 1   1 1 0   1 0 0   0 0 0
  0       2       4       4
0 0 0   0 0 2   0 2 0   2 0 0

0 0 2   0 2 4   2 4 4   4 4 0
  0       0       2       0
0 0 1   0 1 2   1 2 4   2 4 0

The hourglass with the maximum sum () is:

2 4 4
  2
1 2 4
Day 11: 2D Arrays – Hacker Rank Solution
import java.util.Scanner;

/**
 * @author Techno-RJ
 *
 */
public class Day112DArrays {

	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		int arr[][] = new int[6][6];
		for (int i = 0; i < 6; i++) {
			for (int j = 0; j < 6; j++) {
				arr[i][j] = in.nextInt();
			}
		}
		in.close();
		int sum = 0, maxSum = Integer.MIN_VALUE;
		for (int i = 0; i < 6; i++) {
			for (int j = 0; j < 6; j++) {
				if ((i + 2) < 6 && (j + 2) < 6) {
					sum = arr[i][j] + arr[i][j + 1] + arr[i][j + 2] + arr[i + 1][j + 1] + arr[i + 2][j]
							+ arr[i + 2][j + 1] + arr[i + 2][j + 2];
				}
				if (sum > maxSum) {
					maxSum = sum;
				}
			}

		}
		System.out.println(maxSum);
	}
}

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