I remember, some time ago, looking under the hood of Algorithm::Combinatorics, to find it somewhat inefficient. The ntheory equivalents, if they exist, are faster:
use ntheory 'forcomb';
sub Eily_LanX_vr {
my ( $length, $ones ) = @_;
my ( $str, $s, @r );
$str = '0' x $length;
forcomb {
$s = $str;
substr $s, $_, 1, '1' for @_;
push @r, $s;
} $length, $ones;
return \@r
}
cmpthese(-3, {
Eily_LanX_vr => sub { Eily_LanX_vr(25, 5) },
Eily_LanX => sub { Eily_LanX(25, 5) },
});
__END__
Rate Eily_LanX Eily_LanX_vr
Eily_LanX 11.9/s -- -59%
Eily_LanX_vr 29.0/s 143% --
-
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 How to display code and escape characters
are good places to start.