In the previous chapter, we learned the queue called simple.

Let’s briefly look at other types of queues:

• Simple queue;
• Circular queue;
• Priority queue;
• Double ended queue.

Circular queue

The name of the queue tells us how it works. In a simple queue, the first customer goes home after purchasing (it is customary in real life:) ). In a circular queue, the first customer becomes the last one.

Priority queue

A priority queue is a particular type in which each element is associated with a priority and is served according to its importance.

If elements with the same priority occur, they are served according to their order in the queue.

Double-ended queue

Unfortunately, the customer waiting to pay for their purchases may become the last customer, and the lucky previous customer becomes the first in the queue.