Crate pheap

Pairing Heap

A priority queue implemented with a pairing heap.

From Wikipedia:

A pairing heap is a type of heap data structure with relatively simple implementation and excellent practical amortized performance. Pairing heaps are heap-ordered multiway tree structures, and can be considered simplified Fibonacci heaps. They are considered a “robust choice” for implementing such algorithms as Prim’s MST algorithm.

A min-pairing heap supports the following operations:

• find_min: finds the minimum element of the heap, which is the root.
• merge: combines two heaps together.
• insert: adds a new element into the heap.
• delete_min: remove the root and reorder its children nodes.
• decrease_key: decrease the priority of an element. Standard implementation of a heap data structure does not support searching for a key efficiently (which is the case in this crate). Thus, this operation can take very long time, with an upper bound of O(2^(sqrt(log log n))).

Structs

PairingHeap

A min-pairing heap data structure.