matrixElementSum

int matrixElementsSum(int[][] matrix) {
        int[] zeroInColumn = new int[matrix[0].length];
        int sum = 0;
        for (int i = 0; i < matrix.length; i++) {
            for (int j = 0; j < matrix[i].length; j++) {
                if (matrix[i][j] == 0) {
                    zeroInColumn[j] = 1;
                }

                if (zeroInColumn[j] != 1) {
                    sum += matrix[i][j];
                }
            }
        }
        return sum;
    }