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Improve data-structures/heap/README.md #94

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Update data-structure/heap/README.md
CorreyL Jul 7, 2018
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CorreyL Jul 7, 2018
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CorreyL Jul 7, 2018
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19 changes: 13 additions & 6 deletions src/data-structures/heap/README.md
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# Heap (data-structure)

In computer science, a heap is a specialized tree-based
data structure that satisfies the heap property: if `P`
is a parent node of `C`, then the key (the value) of `P`
is either greater than or equal to (in a max heap) or
less than or equal to (in a min heap) the key of `C`.
The node at the "top" of the heap (with no parents) is
called the root node.
data structure that satisfies the heap property.

In a *min heap*, if `P` is a parent node of `C`, then the
key (the value) of `P` is less than or equal to the
key of `C`.

![MinHeap](https://upload.wikimedia.org/wikipedia/commons/6/69/Min-heap.png)

In a *max heap*, the key of `P` is greater than or equal
to the key of `C`

![Heap](https://upload.wikimedia.org/wikipedia/commons/3/38/Max-Heap.svg)

The node at the "top" of the heap with no parents is
called the root node.

## References

- [Wikipedia](https://en.wikipedia.org/wiki/Heap_(data_structure))
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