Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.python > #65828

Re: Sort one sequence by O(n) in time and O(1) in space

Path csiph.com!usenet.pasdenom.info!gegeweb.org!usenet-fr.net!nerim.net!novso.com!newsfeed.xs4all.nl!newsfeed4.news.xs4all.nl!xs4all!newsgate.cistron.nl!newsgate.news.xs4all.nl!post.news.xs4all.nl!not-for-mail
Return-Path <rosuav@gmail.com>
X-Original-To python-list@python.org
Delivered-To python-list@mail.python.org
X-Spam-Status OK 0.068
X-Spam-Evidence '*H*': 0.87; '*S*': 0.01; 'iterate': 0.09; 'cc:addr :python-list': 0.11; '(it': 0.16; 'benjamin': 0.16; 'cc:name:python list': 0.16; 'from:addr:rosuav': 0.16; 'from:name:chris angelico': 0.16; 'mylist': 0.16; 'subject:Sort': 0.16; 'elements': 0.16; 'index': 0.16; 'wrote:': 0.18; 'feb': 0.22; 'cc:addr:python.org': 0.22; 'cc:2**0': 0.24; 'header:In- Reply-To:1': 0.27; 'am,': 0.29; 'subject:) ': 0.29; 'message- id:@mail.gmail.com': 0.30; 'subject:time': 0.33; "can't": 0.35; 'except': 0.35; 'something': 0.35; 'but': 0.35; 'received:google.com': 0.35; 'subject:one': 0.36; 'list': 0.37; 'space': 0.40; 'read': 0.60; 'skip:n 10': 0.64; 'hey,': 0.75; 'more:': 0.84; 'oscar': 0.84; 'subject:space': 0.84; 'technically': 0.84; 'absolutely': 0.87; 'to:none': 0.92
DKIM-Signature v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:cc :content-type; bh=6ue9cf9+FdJKiqa7hI6d1oX+pCk1xp1A9aef5MF7AlY=; b=ScsQBrkJu1Q5tpcBKPq782F9GiATOkwws/r3UfyGyBuI6BTehGiC19pYMqj8tzCA9q akt33vT7PYORGeHHXlIsWzeCO5aBjmfUw4Zk4tQMHmmA1nNcrlDFUPlxCZZs0GLHVz4v vIWDplpXav08KpBV3oCY/nm6FDEC+fCCLxcQth63jU8bq0GoJN1h+guVtlYlAG9Mah5G +xBWeUhpBv5MvitfcL2ikKqvQOalwbRRXpLh35dO2ZWGBenS7yw9jyrAIytc2SPRpoIp WJy12xhiOzx2AJ66XwuhvBDowIl3UPbFeKtPP6n8xrRUXnl3Nz1HkzOZk9UfAzA7Qj4v +h2g==
MIME-Version 1.0
X-Received by 10.68.108.194 with SMTP id hm2mr38763692pbb.22.1392047528543; Mon, 10 Feb 2014 07:52:08 -0800 (PST)
In-Reply-To <CAHVvXxRgcze0ZQrAkE4Xqz60R6h8NKXxRxSoGp+tir7jCp_h7Q@mail.gmail.com>
References <ae372652-0f1c-4d79-82db-a522eb592579@googlegroups.com> <roy-29BD70.10050209022014@news.panix.com> <52f80bca$0$29972$c3e8da3$5496439d@news.astraweb.com> <9671c418-cde8-4857-85ec-52380f8390eb@googlegroups.com> <433934582413720306.205290sturla.molden-gmail.com@news.gmane.org> <CAPTjJmpOfmZurvceoXcx-J3meLOzKSz7RYvaQ1AXpsW0oBMt2A@mail.gmail.com> <2079199387413737237.368296sturla.molden-gmail.com@news.gmane.org> <CAHVvXxRgcze0ZQrAkE4Xqz60R6h8NKXxRxSoGp+tir7jCp_h7Q@mail.gmail.com>
Date Tue, 11 Feb 2014 02:52:08 +1100
Subject Re: Sort one sequence by O(n) in time and O(1) in space
From Chris Angelico <rosuav@gmail.com>
Cc Python List <python-list@python.org>
Content-Type text/plain; charset=UTF-8
X-BeenThere python-list@python.org
X-Mailman-Version 2.1.15
Precedence list
List-Id General discussion list for the Python programming language <python-list.python.org>
List-Unsubscribe <https://mail.python.org/mailman/options/python-list>, <mailto:python-list-request@python.org?subject=unsubscribe>
List-Archive <http://mail.python.org/pipermail/python-list/>
List-Post <mailto:python-list@python.org>
List-Help <mailto:python-list-request@python.org?subject=help>
List-Subscribe <https://mail.python.org/mailman/listinfo/python-list>, <mailto:python-list-request@python.org?subject=subscribe>
Newsgroups comp.lang.python
Message-ID <mailman.6631.1392047537.18130.python-list@python.org> (permalink)
Lines 19
NNTP-Posting-Host 2001:888:2000:d::a6
X-Trace 1392047537 news.xs4all.nl 2886 [2001:888:2000:d::a6]:37308
X-Complaints-To abuse@xs4all.nl
Xref csiph.com comp.lang.python:65828

Show key headers only | View raw

On Tue, Feb 11, 2014 at 2:45 AM, Oscar Benjamin
<oscar.j.benjamin@gmail.com> wrote:
> Something like
>
>     mylist[:] = reorder_generator(mylist)
>
> won't work because the generator would need to access the data
> non-sequentially (it would need to read elements after they were
> overwritten).

This would have O(1) space and O(n) time. It's absolutely perfect...
except that you now don't technically have a list any more:

mylist = reorder_generator(mylist)

You can iterate over it, but can't index it. But hey, it complies with
the space/time requirements!

ChrisA

Back to comp.lang.python | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

Sort one sequence by O(n) in time and O(1) in space Wesley <nispray@gmail.com> - 2014-02-09 04:13 -0800
  Re: Sort one sequence by O(n) in time and O(1) in space Asaf Las <roegltd@gmail.com> - 2014-02-09 04:29 -0800
  Re: Sort one sequence by O(n) in time and O(1) in space Chris Angelico <rosuav@gmail.com> - 2014-02-09 23:39 +1100
    Re: Sort one sequence by O(n) in time and O(1) in space Wesley <nispray@gmail.com> - 2014-02-09 18:09 -0800
      Re: Sort one sequence by O(n) in time and O(1) in space Dave Angel <davea@davea.name> - 2014-02-09 22:00 -0500
  Re: Sort one sequence by O(n) in time and O(1) in space Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2014-02-09 13:41 +0000
  Re: Sort one sequence by O(n) in time and O(1) in space Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2014-02-09 14:30 +0000
  Re: Sort one sequence by O(n) in time and O(1) in space Ni Wesley <nispray@gmail.com> - 2014-02-09 22:40 +0800
  Re: Sort one sequence by O(n) in time and O(1) in space Roy Smith <roy@panix.com> - 2014-02-09 10:05 -0500
    Re: Sort one sequence by O(n) in time and O(1) in space Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-02-09 23:14 +0000
      Re: Sort one sequence by O(n) in time and O(1) in space Roy Smith <roy@panix.com> - 2014-02-09 19:15 -0500
      Re: Sort one sequence by O(n) in time and O(1) in space Wesley <nispray@gmail.com> - 2014-02-09 18:26 -0800
        Re: Sort one sequence by O(n) in time and O(1) in space Sturla Molden <sturla.molden@gmail.com> - 2014-02-10 10:20 +0000
          Re: Sort one sequence by O(n) in time and O(1) in space Steven D'Aprano <steve@pearwood.info> - 2014-02-11 05:20 +0000
            Re: Sort one sequence by O(n) in time and O(1) in space Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2014-02-12 11:56 +1300
          Re: Sort one sequence by O(n) in time and O(1) in space Tim Daneliuk <tundra@tundraware.com> - 2014-02-10 23:37 -0600
          Re: Sort one sequence by O(n) in time and O(1) in space Tim Daneliuk <tundra@tundraware.com> - 2014-02-10 23:37 -0600
        Re: Sort one sequence by O(n) in time and O(1) in space Chris Angelico <rosuav@gmail.com> - 2014-02-10 21:37 +1100
        Re: Sort one sequence by O(n) in time and O(1) in space Sturla Molden <sturla.molden@gmail.com> - 2014-02-10 15:03 +0000
        Re: Sort one sequence by O(n) in time and O(1) in space Chris Angelico <rosuav@gmail.com> - 2014-02-11 02:23 +1100
        Re: Sort one sequence by O(n) in time and O(1) in space Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2014-02-10 15:45 +0000
        Re: Sort one sequence by O(n) in time and O(1) in space Chris Angelico <rosuav@gmail.com> - 2014-02-11 02:52 +1100
          Re: Sort one sequence by O(n) in time and O(1) in space Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2014-02-11 13:19 +1300
        Re: Sort one sequence by O(n) in time and O(1) in space Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2014-02-10 16:41 +0000
  Re: Sort one sequence by O(n) in time and O(1) in space Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2014-02-09 15:48 +0000
    Re: Sort one sequence by O(n) in time and O(1) in space Wesley <nispray@gmail.com> - 2014-02-09 18:07 -0800
  Re: Sort one sequence by O(n) in time and O(1) in space Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-02-09 21:31 +0000

csiph-web