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Re: Qucksort for Linked List

From Juha Nieminen <nospam@thanks.invalid>
Newsgroups comp.lang.c++
Subject Re: Qucksort for Linked List
Date 2016-12-19 08:06 +0000
Organization Netfront http://www.netfront.net/
Message-ID <o384ef$1irf$1@adenine.netfront.net> (permalink)
References (6 earlier) <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>

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Tim Rentsch <txr@alumni.caltech.edu> wrote:
> There is no reason that the choice of a pivot value has to be any
> worse in a linked list quicksort than an array quicksort.  In
> particular, the entire linked list can be scanned, any constant
> number of times, looking for a pivot value, without changing the
> order of the algorithm.

In addition, it's possible to optimize the constant factor of the
computational complexity, for example if you would want to use the
median-of-the-first-last-and-middle pivot method: The very first
time you perform the partitioning just choose the first element as
the pivot, but as you distribute the nodes into the two new lists,
keep note of the last and middle elements of said lists. Then when
partitioning them, you can choose their pivots from those three
nodes. No need to scan the lists.

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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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