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Since Heapify is a recursive function, its space complexity is $O(logn)$ because of the stack space required for recursion.

I also read that space complexity of heapsort is $O(1)$ beause of the explanation here - https://gateoverflow.in/79909/space-complexity-of-heap-sort .

So my question is why the space complexity of **Build Heap** is $O(logn)$ ?

If space complexity of build heap is $O(logn)$ then heapsorts complexity should also be the same . What am I missing here ?