so I don't think that you are going to approach O(N log U). Much less O(D Log U).

N==D (the number of records not excluding duplicates) so your "Much less" makes no sense.

Your computations involving N and S seem to be wandering around thinking that merge sort is something other than O(N*log(N)) (and ignoring duplicates altogether). So, no insights to be gained from those.

- tye        

In reply to Re^9: In-place sort with order assignment (calculations) by tye
in thread In-place sort with order assignment by BrowserUk

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