Numbers - Iteco

import java.util.Arrays;
import java.util.Scanner;

public class Numbers {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int[][] matrix = readMatrix(scanner);
        int[][] biggerMatrix = new int[matrix.length + 2][matrix[0].length + 2];

        for (int i = 0; i < biggerMatrix.length; i++) {
            for (int j = 0; j < biggerMatrix[i].length; j++) {
                if (i == 0 || i == biggerMatrix.length - 1 || j == 0 || j == biggerMatrix[i].length - 1) {
                    biggerMatrix[i][j] = 0;
                } else {
                    biggerMatrix[i][j] = matrix[i - 1][j - 1];
                }
            }
        }

        int counter = 0;

        for (int i = 1; i < biggerMatrix.length - 1; i++) {
            for (int j = 1; j < biggerMatrix[i].length - 1; j++) {
                if (sumElement(i, j, biggerMatrix) == biggerMatrix[i][j]) {
                    counter++;
                }
            }
        }

        System.out.println(counter);

    }

    private static int sumElement(int i, int j, int[][] matrix) {
        int sum = matrix[i - 1][j - 1] + matrix[i - 1][j] + matrix[i - 1][j + 1] +
                matrix[i][j - 1] + matrix[i][j + 1] +
                matrix[i + 1][j - 1] + matrix[i + 1][j] + matrix[i + 1][j +1];

        return sum;
    }


    private static int[][] readMatrix(Scanner scanner) {
        int[] sizes = Arrays.stream(scanner.nextLine().split("\\s+")).mapToInt(Integer::parseInt).toArray();

        int rows = sizes[0];
        int cols = sizes[1];

        int[][] matrix = new int[rows][];

        for (int i = 0; i < rows; i++) {
            matrix[i] = Arrays.stream(scanner.nextLine().split("\\s+")).mapToInt(Integer::parseInt).toArray();
        }

        return matrix;
    }

}