From: "Dário Abdulrehman" <drehman31@gmail.com>
To: "Bruno De Fraine" <Bruno.De.Fraine@vub.ac.be>
Cc: "Jon Harrop" <jon@ffconsultancy.com>, caml-list@inria.fr
Subject: Re: [Caml-list] kth smallest element
Date: Tue, 16 Jan 2007 11:25:59 +0000 [thread overview]
Message-ID: <6aeedf580701160325tdcf56cbvb2b1cef00998148c@mail.gmail.com> (raw)
In-Reply-To: <64962DD2-F738-4812-B6BA-29ED5CF1AD75@vub.ac.be>
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This is not a trivial problem as can be seen here:
http://en.wikipedia.org/wiki/Selection_algorithm
http://www.derekroconnor.net/home/MMS406/Sorting.pdf
Bruno, I think the modified quicksort explained in the PDF is more efficient
than using a min-heap.
On 1/16/07, Bruno De Fraine <Bruno.De.Fraine@vub.ac.be> wrote:
>
> On 15 Jan 2007, at 20:56, Jon Harrop wrote:
> > Anyone got code for the kth smallest element in a list that I can
> > borrow?
>
> I have code for a set that can be limited to a certain size. While
> you add a potentially very large number of elements, the set will
> retain the 30 largest elements it has seen up to that point (given
> that the set was initialized with bound 30). You could modify the
> code to keep track of the smallest elements instead.
>
> Regards,
> Bruno
>
>
>
>
>
> --
> Bruno De Fraine
> Vrije Universiteit Brussel
> Faculty of Applied Sciences, INFO - SSEL
> Room 4K208, Pleinlaan 2, B-1050 Brussels
> tel: +32 (0)2 629 29 75
> fax: +32 (0)2 629 28 70
> e-mail: Bruno.De.Fraine@vub.ac.be
>
>
>
>
> _______________________________________________
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>
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prev parent reply other threads:[~2007-01-16 11:26 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-01-15 19:56 Jon Harrop
2007-01-16 8:32 ` [Caml-list] " Bruno De Fraine
2007-01-16 11:25 ` Dário Abdulrehman [this message]
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