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Heapsort is an efficient comparison-based sorting algorithm that divides an input into a sorted and an unsorted part and iteratively shrinks the unsorted part by extracting the largest element and moving that to the sorted part. Run time is O(n log n).

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Heap sort implementation in Python 3

Most of what I say here is covered in PEP8. In assignment statements, surround an "=" with a space on either side. Function parameters are separated by a comma followed by another space If '''To swa …
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