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Heapsort

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

In-place

Use this tag on questions about algorithms that modify the data in-place, as opposed to making a copy



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Example

Sort the data by some unique identifier i recommend using heapsort as it s in-place generic in that you can provide a comparison function and it will work with that and you could probably look up an iterative implementation in python

from question  

Handling millions of rows in Python

But heapsort is assumed to be on average somewhat slower than standard in-place quicksort

from question  

Why not use heap sort always

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