What are the key features of C++11's std::priority_queue?

What are the key features of C++11's std::priority_queue?

C++11's std::priority_queue is a container adapter that provides a way to manage a collection of elements in a priority order. It allows for efficient retrieval of the highest (or lowest) priority element.

How does it differ from a regular queue?

Unlike a regular queue, which follows FIFO (First In, First Out), a priority queue allows elements to be accessed based on their priority, meaning the highest priority element is always at the front.

Can you give an example of how to use it?

Sure! You can use std::priority_queue like this: std::priority_queue<int> pq; pq.push(10); pq.push(5); pq.push(20); The top element will be 20.

What are the underlying data structures used?

The underlying data structure for std::priority_queue is typically a max-heap, which allows for efficient insertion and removal of the highest priority element.