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Groups > comp.lang.python > #86352
| References | <1cf84559-3a63-4799-a879-ae8e513d387e@googlegroups.com> <mciuv6$r24$1@reader1.panix.com> |
|---|---|
| From | Ian Kelly <ian.g.kelly@gmail.com> |
| Date | 2015-02-24 15:59 -0700 |
| Subject | Re: Bug in timsort!? |
| Newsgroups | comp.lang.python |
| Message-ID | <mailman.19151.1424819247.18130.python-list@python.org> (permalink) |
On Tue, Feb 24, 2015 at 3:45 PM, Grant Edwards <invalid@invalid.invalid> wrote:
> On 2015-02-24, Roy Smith <roy@panix.com> wrote:
>
>> http://envisage-project.eu/proving-android-java-and-python-sorting-algorithm-is-broken-and-how-to-fix-it/
>
> I don't get it.
>
> 3.2 Corrected Python merge_collapse function
>
> merge_collapse(MergeState *ms)
> {
> struct s_slice *p = ms->pending;
>
> assert(ms);
> while (ms->n > 1) {
> Py_ssize_t n = ms->n - 2;
> if ( n > 0 && p[n-1].len <= p[n].len + p[n+1].len
> || (n-1 > 0 && p[n-2].len <= p[n].len + p[n-1].len)) {
> if (p[n-1].len < p[n+1].len)
> --n;
> if (merge_at(ms, n) < 0)
> return -1;
> }
> else if (p[n].len <= p[n+1].len) {
> if (merge_at(ms, n) < 0)
> return -1;
> }
> else
> break;
> }
> return 0;
> }
>
> Or does "Python function" mean something else in this context?
Recall that CPython is implemented in C. ;-)
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Bug in timsort!? Roy Smith <roy@panix.com> - 2015-02-24 13:34 -0800
Re: Bug in timsort!? Zachary Ware <zachary.ware+pylist@gmail.com> - 2015-02-24 15:40 -0600
Re: Bug in timsort!? Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-02-24 21:49 +0000
Re: Bug in timsort!? sohcahtoa82@gmail.com - 2015-02-24 14:36 -0800
Re: Bug in timsort!? Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-02-25 00:38 +0000
Re: Bug in timsort!? Grant Edwards <invalid@invalid.invalid> - 2015-02-24 22:45 +0000
Re: Bug in timsort!? Ian Kelly <ian.g.kelly@gmail.com> - 2015-02-24 15:59 -0700
Re: Bug in timsort!? Robert Kern <robert.kern@gmail.com> - 2015-02-25 11:34 +0000
Re: Bug in timsort!? Grant Edwards <invalid@invalid.invalid> - 2015-02-25 15:49 +0000
Re: Bug in timsort!? Chris Angelico <rosuav@gmail.com> - 2015-02-25 10:33 +1100
Re: Bug in timsort!? MRAB <python@mrabarnett.plus.com> - 2015-02-24 23:38 +0000
Re: Bug in timsort!? Skip Montanaro <skip.montanaro@gmail.com> - 2015-02-24 17:50 -0600
Re: Bug in timsort!? Chris Angelico <rosuav@gmail.com> - 2015-02-25 11:07 +1100
Re: Bug in timsort!? Paddy <paddy3118@gmail.com> - 2015-02-25 01:10 -0800
Re: Bug in timsort!? Chris Angelico <rosuav@gmail.com> - 2015-02-25 21:11 +1100
Re: Bug in timsort!? Chris Kaynor <ckaynor@zindagigames.com> - 2015-02-24 16:38 -0800
Re: Bug in timsort!? Terry Reedy <tjreedy@udel.edu> - 2015-02-24 21:52 -0500
Re: Bug in timsort!? Dave Angel <davea@davea.name> - 2015-02-24 21:41 -0500
Re: Bug in timsort!? Ned Deily <nad@acm.org> - 2015-02-25 01:04 -0800
Re: Bug in timsort!? Sturla Molden <sturla.molden@gmail.com> - 2015-02-25 14:58 +0100
Re: Bug in timsort!? alister <alister.nospam.ware@ntlworld.com> - 2015-02-25 15:03 +0000
Re: Bug in timsort!? Zachary Ware <zachary.ware+pylist@gmail.com> - 2015-02-25 09:23 -0600
Re: Bug in timsort!? Terry Reedy <tjreedy@udel.edu> - 2015-02-25 16:08 -0500
Re: Bug in timsort!? Roy Smith <roy@panix.com> - 2015-02-25 19:12 -0500
Re: Bug in timsort!? Jonas Wielicki <jonas@wielicki.name> - 2015-02-25 15:07 +0100
Re: Bug in timsort!? Chris Angelico <rosuav@gmail.com> - 2015-02-26 01:33 +1100
Re: Bug in timsort!? Sturla Molden <sturla.molden@gmail.com> - 2015-02-25 16:05 +0100
Re: Bug in timsort!? Chris Angelico <rosuav@gmail.com> - 2015-02-26 02:11 +1100
Re: Bug in timsort!? Peter Otten <__peter__@web.de> - 2015-02-25 17:04 +0100
Re: Bug in timsort!? Mario Figueiredo <marfig@gmail.com> - 2015-02-25 18:22 +0100
Re: Bug in timsort!? Sturla Molden <sturla.molden@gmail.com> - 2015-02-25 19:41 +0100
Re: Bug in timsort!? Jonas Wielicki <jonas@wielicki.name> - 2015-02-25 19:46 +0100
Re: Bug in timsort!? Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-02-25 20:07 +0000
Re: Bug in timsort!? Sturla Molden <sturla.molden@gmail.com> - 2015-02-25 17:44 +0100
Re: Bug in timsort!? Mario Figueiredo <marfig@gmail.com> - 2015-02-25 18:29 +0100
Re: Bug in timsort!? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-02-26 10:13 +1100
Re: Bug in timsort!? Ian Kelly <ian.g.kelly@gmail.com> - 2015-02-25 22:51 -0700
Re: Bug in timsort!? Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-02-25 16:50 +0000
Re: Bug in timsort!? Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-02-25 16:55 +0000
Re: Bug in timsort!? Chris Kaynor <ckaynor@zindagigames.com> - 2015-02-25 08:56 -0800
Re: Bug in timsort!? Chris Angelico <rosuav@gmail.com> - 2015-02-26 04:18 +1100
Re: Bug in timsort!? Peter Otten <__peter__@web.de> - 2015-02-25 18:21 +0100
Re: Bug in timsort!? Ian Kelly <ian.g.kelly@gmail.com> - 2015-02-25 12:42 -0700
Re: Bug in timsort!? Serhiy Storchaka <storchaka@gmail.com> - 2015-02-26 09:33 +0200
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