What is a C++ priority queue?

A C++ priority queue is a type of container adapter, specifically designed such that the first element of the queue is either the greatest or the smallest of all elements in the queue, and elements are in non-increasing or non-decreasing order (hence we can see that each element of the queue has a priority {fixed order}).

How to insert a new element into a priority queue?

Used to insert a new element into the priority queue container. Represents the type of object stored as an element in a priority_queue. It acts as a synonym for the template parameter. 1. Inserting and Removing Elements of a Priority Queue The push () method is used to insert an element into the priority queue.

Why do we use priority_queue class?

The restriction to accessing only the front and back elements in this way is the reason for using the queue class. The priority_queue class orders its elements so that the largest element is always at the top position. It supports insertion of an element and the inspection and removal of the top element.

Why is the Order of elements in a priority queue less predictable?

At times it is less predictable:. This is because the order of elements in a priority queue is determined by their priority values, the order in which elements are retrieved may be less predictable than with other data structures like stacks or queues, which follow a first-in, first-out (FIFO) or last-in, first-out (LIFO) order.