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Re: Qucksort for Linked List

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NNTP-Posting-Date Wed, 21 Dec 2016 17:34:05 -0600
From Gareth Owen <gwowen@gmail.com>
Newsgroups comp.lang.c++
Subject Re: Qucksort for Linked List
References <dfa00771-7568-443b-ab45-174f0749a176@googlegroups.com> <o2rcld$nhd$1@dont-email.me> <87d1gue00s.fsf@gmail.com> <mrSdnUOdRsH4JczFnZ2dnUU7-TGdnZ2d@giganews.com> <o30hk4$112$1@adenine.netfront.net> <ANqdnaKugKq-78nFnZ2dnUU7-VWdnZ2d@giganews.com> <kfnpokrdor0.fsf@x-alumni2.alumni.caltech.edu> <o384ef$1irf$1@adenine.netfront.net> <c2dff3d8-e8f3-4c2a-901c-21682bb22918@googlegroups.com> <42d98296-3339-4814-8ba9-d8d71607e5bc@googlegroups.com> <ve-dndpVRPIarcXFnZ2dnUU7-RnNnZ2d@giganews.com> <o3alvq$9kn$1@adenine.netfront.net> <49d489dd-7c85-4bbf-a6a3-1d3e8034d6b0@googlegroups.com> <87poklozd5.fsf@gmail.com> <7tidnZiIoabdRsfFnZ2dnUU7-dmdnZ2d@giganews.com> <87lgv9ovgn.fsf@gmail.com> <48mdnel_q6ZhccfFnZ2dnUU7-VGdnZ2d@giganews.com>
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Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk> writes:

>>> So fuck off; I am right and you are wrong.
>>
>> Not true.  Maths isn't a strong point, is it?
>
> This has nothing to do with maths; this is to do with analysing
> algorithmic complexity.

*facepalm*  Analysing algorithms is a discipline of mathematics.

> See Wikipedia above.

Nevertheless, if you were capable of doing the mathematics, you'd see
that the average case performance is still O(N log N).  The proof that
quicksort is O(N log N) on average is independent of the underlying data
structure.  The reason for this is that choosing a sane pivot (median of
nine say) is O(n), and you can do a fixed number of different O(n) at
each recursive step you don't change the algorithmic complexity (but you
might screw up the constants so badly that it runs much slower than
mergesort).

The Wikipedia section on "Selection based pivoting" describes a scheme
based on this fact.

Note also that proviso in Wikipedia is about *stable* quicksort, and
std::list::sort is *not* required to be stable.  Note also, that some
time ago I mentioned that mergesort is often preferred because it is
stable, where quicksort isn't.

> /Flibble

PS: Your killfile is broken

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Thread

Qucksort for Linked List xerofoify <xerofoify@gmail.com> - 2016-12-02 10:14 -0800
  Re: Qucksort for Linked List Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk> - 2016-12-02 19:17 +0000
    Re: Qucksort for Linked List Melzzzzz <mel@zzzzz.com> - 2016-12-02 22:09 +0100
      Re: Qucksort for Linked List Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk> - 2016-12-02 21:26 +0000
        Re: Qucksort for Linked List Melzzzzz <mel@zzzzz.com> - 2016-12-02 22:37 +0100
          Re: Qucksort for Linked List Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk> - 2016-12-02 21:41 +0000
    Re: Qucksort for Linked List Juha Nieminen <nospam@thanks.invalid> - 2016-12-12 13:16 +0000
      Re: Qucksort for Linked List Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk> - 2016-12-12 18:32 +0000
        Re: Qucksort for Linked List Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk> - 2016-12-12 18:34 +0000
        Re: Qucksort for Linked List asetofsymbols@gmail.com - 2016-12-12 10:44 -0800
          Re: Qucksort for Linked List Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk> - 2016-12-12 21:30 +0000
        Re: Qucksort for Linked List Juha Nieminen <nospam@thanks.invalid> - 2016-12-13 07:26 +0000
          Re: Qucksort for Linked List Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk> - 2016-12-13 17:51 +0000
            Re: Qucksort for Linked List Tim Rentsch <txr@alumni.caltech.edu> - 2016-12-13 14:52 -0800
            Re: Qucksort for Linked List Juha Nieminen <nospam@thanks.invalid> - 2016-12-14 10:26 +0000
            Re: Qucksort for Linked List "Alf P. Steinbach" <alf.p.steinbach+usenet@gmail.com> - 2016-12-14 13:05 +0100
              Re: Qucksort for Linked List Juha Nieminen <nospam@thanks.invalid> - 2016-12-14 14:06 +0000
                Re: Qucksort for Linked List "Alf P. Steinbach" <alf.p.steinbach+usenet@gmail.com> - 2016-12-14 16:59 +0100
              Re: Qucksort for Linked List Gareth Owen <gwowen@gmail.com> - 2016-12-14 20:19 +0000
                Re: Qucksort for Linked List Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk> - 2016-12-14 21:23 +0000
                Re: Qucksort for Linked List Gareth Owen <gwowen@gmail.com> - 2016-12-14 21:42 +0000
                Re: Qucksort for Linked List Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk> - 2016-12-14 22:43 +0000
                Re: Qucksort for Linked List Juha Nieminen <nospam@thanks.invalid> - 2016-12-16 11:02 +0000
                Re: Qucksort for Linked List Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk> - 2016-12-16 23:00 +0000
                Re: Qucksort for Linked List Tim Rentsch <txr@alumni.caltech.edu> - 2016-12-16 23:00 -0800
                Re: Qucksort for Linked List Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk> - 2016-12-17 20:17 +0000
                Re: Qucksort for Linked List Gareth Owen <gwowen@gmail.com> - 2016-12-18 21:15 +0000
                Re: Qucksort for Linked List Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk> - 2016-12-18 21:49 +0000
                Re: Qucksort for Linked List Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk> - 2016-12-18 21:51 +0000
                Re: Qucksort for Linked List Gareth Owen <gwowen@gmail.com> - 2016-12-18 21:52 +0000
                Re: Qucksort for Linked List Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk> - 2016-12-18 21:56 +0000
                Re: Qucksort for Linked List Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk> - 2016-12-18 22:04 +0000
                Re: Qucksort for Linked List Paavo Helde <myfirstname@osa.pri.ee> - 2016-12-19 00:22 +0200
                Re: Qucksort for Linked List "Alf P. Steinbach" <alf.p.steinbach+usenet@gmail.com> - 2016-12-19 00:18 +0100
                Re: Qucksort for Linked List David Brown <david.brown@hesbynett.no> - 2016-12-19 08:58 +0100
                Re: Qucksort for Linked List gwowen <gwowen@gmail.com> - 2016-12-19 06:17 -0800
                Re: Qucksort for Linked List Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk> - 2016-12-19 20:14 +0000
                Re: Qucksort for Linked List woodbrian77@gmail.com - 2016-12-23 10:55 -0800
                Re: Qucksort for Linked List Daniel <danielaparker@gmail.com> - 2016-12-23 12:08 -0800
                Re: Qucksort for Linked List David Brown <david.brown@hesbynett.no> - 2016-12-27 10:39 +0100
                Re: Qucksort for Linked List Mr Flibble <flibble@i42.co.uk> - 2016-12-27 17:48 +0000
                Re: Qucksort for Linked List Mr Flibble <flibble@i42.co.uk> - 2016-12-27 17:53 +0000
                Re: Qucksort for Linked List Gareth Owen <gwowen@gmail.com> - 2016-12-27 18:52 +0000
                Re: Qucksort for Linked List Mr Flibble <flibble@i42.co.uk> - 2016-12-27 19:06 +0000
                Re: Qucksort for Linked List Gareth Owen <gwowen@gmail.com> - 2016-12-27 19:17 +0000
                Re: Qucksort for Linked List Mr Flibble <flibble@i42.co.uk> - 2016-12-27 21:05 +0000
                Re: Qucksort for Linked List Gareth Owen <gwowen@gmail.com> - 2016-12-27 21:15 +0000
                Re: Qucksort for Linked List Mr Flibble <flibble@i42.co.uk> - 2016-12-27 21:21 +0000
                Re: Qucksort for Linked List Gareth Owen <gwowen@gmail.com> - 2016-12-27 21:29 +0000
                Re: Qucksort for Linked List Mr Flibble <flibble@i42.co.uk> - 2016-12-27 21:33 +0000
                Re: Qucksort for Linked List David Brown <david.brown@hesbynett.no> - 2016-12-28 10:03 +0100
                Re: Qucksort for Linked List Gareth Owen <gwowen@gmail.com> - 2016-12-28 15:34 +0000
                Re: Qucksort for Linked List David Brown <david.brown@hesbynett.no> - 2016-12-29 09:38 +0100
                Re: Qucksort for Linked List Mr Flibble <flibble@i42.co.uk> - 2016-12-28 16:40 +0000
                Re: Qucksort for Linked List Daniel <danielaparker@gmail.com> - 2016-12-28 08:55 -0800
                Re: Qucksort for Linked List Gareth Owen <gwowen@gmail.com> - 2016-12-28 17:02 +0000
                Re: Qucksort for Linked List Mr Flibble <flibble@i42.co.uk> - 2016-12-28 17:12 +0000
                Re: Qucksort for Linked List Mr Flibble <flibble@i42.co.uk> - 2016-12-28 17:21 +0000
                Re: Qucksort for Linked List Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk> - 2016-12-29 11:05 -0600
                Re: Qucksort for Linked List Gareth Owen <gwowen@gmail.com> - 2016-12-29 17:43 +0000
                Re: Qucksort for Linked List David Brown <david.brown@hesbynett.no> - 2016-12-30 09:48 +0100
                Re: Qucksort for Linked List Gareth Owen <gwowen@gmail.com> - 2016-12-30 11:37 +0000
                Re: Qucksort for Linked List David Brown <david.brown@hesbynett.no> - 2016-12-30 13:23 +0100
                Re: Qucksort for Linked List David Brown <david.brown@hesbynett.no> - 2016-12-29 11:00 +0100
                Re: Qucksort for Linked List David Brown <david.brown@hesbynett.no> - 2016-12-29 09:43 +0100
                Re: Qucksort for Linked List Gareth Owen <gwowen@gmail.com> - 2016-12-18 22:56 +0000
                Re: Qucksort for Linked List Gareth Owen <gwowen@gmail.com> - 2016-12-18 22:52 +0000
                Re: Qucksort for Linked List Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk> - 2016-12-18 23:07 +0000
                Re: Qucksort for Linked List Gareth Owen <gwowen@gmail.com> - 2016-12-19 05:48 +0000
                Re: Qucksort for Linked List Juha Nieminen <nospam@thanks.invalid> - 2016-12-19 08:09 +0000
                Re: Qucksort for Linked List Juha Nieminen <nospam@thanks.invalid> - 2016-12-19 08:06 +0000
                Re: Qucksort for Linked List leigh.v.johnston@googlemail.com - 2016-12-19 04:46 -0800
                Re: Qucksort for Linked List bartekltg <bartekltg@gmail.com> - 2016-12-19 15:04 +0100
                Re: Qucksort for Linked List gwowen <gwowen@gmail.com> - 2016-12-19 06:40 -0800
                Re: Qucksort for Linked List bartekltg <bartekltg@gmail.com> - 2016-12-19 18:48 +0100
                Re: Qucksort for Linked List Gareth Owen <gwowen@gmail.com> - 2016-12-19 18:53 +0000
                Re: Qucksort for Linked List bartekltg <bartekltg@gmail.com> - 2016-12-19 21:26 +0100
                Re: Qucksort for Linked List Gareth Owen <gwowen@gmail.com> - 2016-12-19 20:32 +0000
                Re: Qucksort for Linked List Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk> - 2016-12-19 19:09 +0000
                Re: Qucksort for Linked List Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk> - 2016-12-19 19:14 +0000
                Re: Qucksort for Linked List Gareth Owen <gwowen@gmail.com> - 2016-12-19 19:31 +0000
                Re: Qucksort for Linked List Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk> - 2016-12-19 19:45 +0000
                Re: Qucksort for Linked List Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk> - 2016-12-19 20:19 +0000
                Re: Qucksort for Linked List Juha Nieminen <nospam@thanks.invalid> - 2016-12-20 07:18 +0000
                Re: Qucksort for Linked List leigh.v.johnston@googlemail.com - 2016-12-20 04:31 -0800
                Re: Qucksort for Linked List Juha Nieminen <nospam@thanks.invalid> - 2016-12-21 07:08 +0000
                Re: Qucksort for Linked List Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk> - 2016-12-21 19:39 +0000
                Re: Qucksort for Linked List Gareth Owen <gwowen@gmail.com> - 2016-12-21 20:54 +0000
                Re: Qucksort for Linked List Gareth Owen <gwowen@gmail.com> - 2016-12-21 19:28 +0000
                Re: Qucksort for Linked List Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk> - 2016-12-21 19:43 +0000
                Re: Qucksort for Linked List Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-12-21 20:34 +0000
                Re: Qucksort for Linked List Gareth Owen <gwowen@gmail.com> - 2016-12-21 20:53 +0000
                Re: Qucksort for Linked List Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk> - 2016-12-21 20:58 +0000
                Re: Qucksort for Linked List Gareth Owen <gwowen@gmail.com> - 2016-12-21 23:34 +0000
                Re: Qucksort for Linked List Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk> - 2016-12-22 00:19 +0000
                Re: Qucksort for Linked List Juha Nieminen <nospam@thanks.invalid> - 2017-01-04 07:04 +0000
                Re: Qucksort for Linked List Daniel <danielaparker@gmail.com> - 2017-01-04 07:18 -0800
                Re: Qucksort for Linked List Gareth Owen <gwowen@gmail.com> - 2017-01-04 18:39 +0000
                Re: Qucksort for Linked List Daniel <danielaparker@gmail.com> - 2017-01-05 07:29 -0800
                Re: Qucksort for Linked List Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk> - 2017-01-05 21:21 +0000
                Re: Qucksort for Linked List Ian Collins <ian-news@hotmail.com> - 2017-01-06 10:35 +1300
                Re: Qucksort for Linked List Tim Rentsch <txr@alumni.caltech.edu> - 2016-12-22 21:43 -0800
                Re: Qucksort for Linked List Tim Rentsch <txr@alumni.caltech.edu> - 2016-12-22 22:09 -0800
                Re: Qucksort for Linked List Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk> - 2016-12-23 17:00 +0000
                Re: Qucksort for Linked List Tim Rentsch <txr@alumni.caltech.edu> - 2016-12-23 12:03 -0800
                Re: Qucksort for Linked List Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk> - 2016-12-23 20:25 +0000
                Re: Qucksort for Linked List Gareth Owen <gwowen@gmail.com> - 2016-12-23 20:56 +0000
                Re: Qucksort for Linked List Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk> - 2016-12-23 22:02 +0000
                Re: Qucksort for Linked List Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk> - 2016-12-23 22:14 +0000
                Re: Qucksort for Linked List Tim Rentsch <txr@alumni.caltech.edu> - 2016-12-29 13:56 -0800
                Re: Qucksort for Linked List Mr Flibble <flibble@i42.co.uk> - 2016-12-29 23:26 +0000
                Re: Qucksort for Linked List Tim Rentsch <txr@alumni.caltech.edu> - 2016-12-29 20:25 -0800
                Re: Qucksort for Linked List Juha Nieminen <nospam@thanks.invalid> - 2017-01-04 07:07 +0000
                Re: Qucksort for Linked List Tim Rentsch <txr@alumni.caltech.edu> - 2017-01-26 22:40 -0800
  Re: Qucksort for Linked List xerofoify <xerofoify@gmail.com> - 2016-12-02 13:47 -0800
    Re: Qucksort for Linked List ruben safir <ruben@mrbrklyn.com> - 2016-12-02 17:38 -0500
      Re: Qucksort for Linked List xerofoify <xerofoify@gmail.com> - 2016-12-02 14:53 -0800
        Re: Qucksort for Linked List Jerry Stuckle <jstucklex@attglobal.net> - 2016-12-02 19:50 -0500
        Re: Qucksort for Linked List ruben safir <ruben@mrbrklyn.com> - 2016-12-02 21:17 -0500
          Re: Qucksort for Linked List xerofoify <xerofoify@gmail.com> - 2016-12-02 20:44 -0800
            Re: Qucksort for Linked List xerofoify <xerofoify@gmail.com> - 2016-12-02 20:52 -0800
              Re: Qucksort for Linked List Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-12-03 11:07 +0000
            Re: Qucksort for Linked List ruben safir <ruben@mrbrklyn.com> - 2016-12-03 13:38 -0500
    Re: Qucksort for Linked List Öö Tiib <ootiib@hot.ee> - 2016-12-03 01:46 -0800
      Re: Qucksort for Linked List Juha Nieminen <nospam@thanks.invalid> - 2016-12-12 13:18 +0000
  Re: Qucksort for Linked List "Alf P. Steinbach" <alf.p.steinbach+usenet@gmail.com> - 2016-12-03 01:16 +0100
    Re: Qucksort for Linked List bartekltg <bartekltg@gmail.com> - 2016-12-03 08:25 +0100
  Re: Qucksort for Linked List bartekltg <bartekltg@gmail.com> - 2016-12-03 08:05 +0100

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