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I have a priority queue of events, but sometimes the event priorities change, so I'd like to maintain iterators from the event requesters into the heap. If the priority changes, I'd like the heap to be adjusted in log(n) time. I will always have exactly one iterator pointing to each element in the heap.
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We can use heaps to implement the priority queue. It will take O(log N) time to insert and delete each element in the priority queue. Based on heap structure, priority queue also has two types max- priority queue and min - priority queue.
The priority queue is the queue data structure and the heap is the tree data structure that operates and organizes data. The priority queue is based on a queue data structure working as a queue with a priority function. The heap is a tree data structure uses for sorting data in a specific order using an algorithm.
Another method for making min-heap using default priority_queue: This is frequently used in Competitive Programming. We first multiply all elements with (-1). Then we create a max heap (max heap is the default for priority queue).
Priority Queue is an extension of the queue with the following properties: Every item has a priority associated with it. An element with high priority is dequeued before an element with low priority. If two elements have the same priority, they are served according to their order in the queue.
Take a look at Boost's mutable heaps.
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