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In computer science, a heap is a tree-based data structure that satisfies the heap property: In a max heap, for any given node C, if P is the parent node of C, then the key (the value) of P is greater than or equal to the key of C. In a min heap, the key of P is less than or equal to the key of C. [1] The node at the "top" of the heap (with no ...
Despite this, the C code does not copy C stack frames, only Scheme objects, so it does not require knowledge of the C implementation. In full, the Scheme heap consists of the C stack as the nursery together with the two heaps required by the generational garbage collector. This approach gives the speed of the C stack for many operations, and it ...
Some additional operations that can be implemented for the meldable heap that also have O(logn) worst-case efficiency are: Remove(u) - Remove the node u and its key from the heap. Absorb(Q) - Add all elements of the meldable heap Q to this heap, emptying Q in the process. DecreaseKey(u, y) - Decreases the key in node u to y (pre-condition: y ...
Swap the first element of the heap with the last element of the heap. Remove the last element from the heap and put it at the end of the list. Adjust the heap so that the first element ends up at the right place in the heap. Repeat Step 2 and 3 until the heap has only one element. Put this last element at the end of the list and output the list.
The general heap order must be enforced; Every operation (add, remove_min, merge) on two skew heaps must be done using a special skew heap merge. A skew heap is a self-adjusting form of a leftist heap which attempts to maintain balance by unconditionally swapping all nodes in the merge path when merging two heaps. (The merge operation is also ...
Free lists make the allocation and deallocation operations very simple. To free a region, one would just link it to the free list. To allocate a region, one would simply remove a single region from the end of the free list and use it. If the regions are variable-sized, one may have to search for a region of large enough size, which can be ...
First, a weak heap is built out of all of the elements of the array, and then the root is repeatedly exchanged with the last element, which is sifted down to its proper place. A weak heap of n elements can be formed in n − 1 merges. It can be done on various orders, but a simple bottom-up implementation works from the end of the array to the ...
In computer science, an addressable heap is an abstract data type. Specifically, it is a mergeable heap supporting access to the elements of the heap via handles (also called references ). It allows the key of the element referenced by a particular handle to be removed or decreased.