// if a cyclist (and a pizza) is available then let them deliver the next pizza from the queue
            for(Map.Entry<Integer, Integer> i : cyclists.entrySet()){
                if (time > i.getValue() && !queue.isEmpty()) {

                    // obtain next pizza from the queue
                    Pizza deliveredPizza = queue.poll();

                    // is it impossible to deliver this pizza on time?
                    if (time + deliveredPizza.deliveryTime() > deliveredPizza.deadline()) {

                        // refund the pizza price with a penalty factor applied
                        total -= deliveredPizza.latePrice();

                        // update the late pizza counts
                        if (deliveredPizza.isUrgent())
                            countLateUrgent++;
                        else
                            countLateStandard++;

                    } else  // delivery on time was possible
                        countOnTime++;

                    // calculate busy time for cyclist
                    int fullTripTime = 2 * deliveredPizza.deliveryTime();

                    // update profit tally with delivery cost
                    total -= Pizza.PerMinuteDeliveryCost * fullTripTime;

                    cyclists.put(i.getKey(), time+fullTripTime);
                }
            }