How to sort in-place using the merge sort algorithm?

Posted by eSKay on Stack Overflow See other posts from Stack Overflow or by eSKay
Published on 2010-04-03T11:04:17Z Indexed on 2010/04/03 11:13 UTC
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algorithm

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merge

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mergesort

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sorting

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inplace

I know the question is too open.

All I want is someone to tell me how to convert a normal merge sort into an in-place merge sort (or a merge sort with constant extra space overhead).

All I can find (on the net) is pages saying "it is too complex" or "out of scope of this text". "The only known ways to merge in-place (without any extra space) are too complex to be reduced to practical program." (from here)

Even if it is too complex, can somebody outline the basic concept of how to make the merge sort in-place?

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