As queues are largely applied in Computer Science and also in our lives, there are some modified versions of the default queue we implemented in the previous topic.

One modified version is the priority queue. Elements are added and removed based on a priority. An example from real life is the boarding line at the airport. First class and business class passengers have priority over coach class passengers. In some countries, elderly people and pregnant women (or women with newborn children) also have priority for boarding over other passengers.

Another example from real life is the patient's waiting room from a hospital (emergency department). Patients that have a severe condition are seen by a doctor prior to patients with a less severe condition. Usually, a nurse will do the triage and assign a code to the patient depending on the condition severity.

There are two options when implementing a priority queue: you can set the priority and add the element at the correct position...