Beefy Boxes and Bandwidth Generously Provided by pair Networks
P is for Practical
 
PerlMonks  

comment on

( #3333=superdoc: print w/replies, xml ) Need Help??

As vr pointed out this only performs well on already sorted lists but falls behind pretty fast otherwise. This actually means that you can make it run faster on unsorted list by sorting twice (still doesn't beat most of the leading propositions though):

use warnings; use strict; use Benchmark 'cmpthese'; use constant DO_CHECK => 0; use if DO_CHECK, 'Data::Compare', qw/Compare/; my @input = (-57..50,52,0); my @output = (0,0..50,52,-57..-1); use List::Util 'shuffle'; srand 123; @input = shuffle @input; cmpthese(DO_CHECK ? 1 : -2, { Eily => sub { my @list = @input; @list = sort { ~$b <=> ~$a } @list; Compare(\@list,\@output) or die "@list" if DO_CHECK; }, Eily2 => sub { my @list = @input; @list = sort { ~$b <=> ~$a } sort { $a <=> $b } @list; Compare(\@list,\@output) or die "@list" if DO_CHECK; }, }); __END__ Rate Eily Eily2 Eily 20139/s -- -58% Eily2 47615/s 136% --
Going twice as fast by doing the job twice, talk about counter intuitive :D.


In reply to Re^2: Fastest way to sort a list of integers into 0,1,2,3,-3,-2,-1 by Eily
in thread Fastest way to sort a list of integers into 0,1,2,3,-3,-2,-1 by haukex

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • Are you posting in the right place? Check out Where do I post X? to know for sure.
  • Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
    <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>
  • Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
  • Want more info? How to link or or How to display code and escape characters are good places to start.
Log In?
Username:
Password:

What's my password?
Create A New User
Domain Nodelet?
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others exploiting the Monastery: (1)
As of 2021-10-21 02:39 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?
    My first memorable Perl project was:







    Results (82 votes). Check out past polls.

    Notices?