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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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Accepted
Heap Sort Implementation in Python
See §1.9 for the cause of the bug identified by janos.
1. Review
The code only runs on Python 2.7, because it uses the / operator for floor division. But support for Python 2.7 is scheduled to end …