According to http://en.wikipedia.org/wiki/Heap_%28data_structure%29#Comparison_of_theoretic_bounds_for_variants, it takes Θ(logn) (which translates to O(logn)) to perform the decrease-key operation. However, there seems to be no site that includes a binary heap implementation with a decrease-key operation.
Given therefore the lack of implementations on the web, is it possible to perform the decrease-key operation in a binary heap?
In this tutorial, we'll present a third operation called decrease-key, which allows us to decrease the value of a certain key inside the data structure. Mainly, the decrease-key operation is used in Dijkstra's algorithm when we discover a new path to a certain node at a lower cost.
Binary heaps are also commonly employed in the heapsort sorting algorithm, which is an in-place algorithm because binary heaps can be implemented as an implicit data structure, storing keys in an array and using their relative positions within that array to represent child–parent relationships.
Statement (IV) is false, because construction of binary search tree from max-heap will take O(nlogn) time.
Heap Increase Key Since we will want to use a heap to implement a priority queue, an operation of interest to us is the change key operation. In the case of a maximum priority queue the operation of interest is the increase key operation.
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