Beefy Boxes and Bandwidth Generously Provided by pair Networks
There's more than one way to do things
 
PerlMonks  

comment on

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

Heh, I just had what might be a great idea on how to do the first sort.

It is trivial to do a two-item optimization in your sort comparison routine. This is "cheating" because you can end up telling sort that you want $a < $b and $b < $c but $c < $a. On old versions of Perl, that might even cause a core dump. I think it is actually documented as safe on modern Perl, however.

my @order = sort { $Costs[$a]+$Trims[$a]*$Costs[$b] <=> $Costs[$b]+$Trims[$b]*$Costs[ +$a] } 0..$#Costs; @Trims = @Trims[@order]; @Costs = @Costs[@order];

It is that simple. It worked reasonable well in a couple of test cases. It even found an optimal solution on the first try for my prior example above (but took too long to declare success, probably indicating a bug).

- tye        


In reply to Re^2: Evolving a faster filter? (sort) by tye
in thread Evolving a faster filter? by Ovid

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 wandering the Monastery: (1)
As of 2021-10-23 15:21 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?
    My first memorable Perl project was:







    Results (88 votes). Check out past polls.

    Notices?