### Comment on

 Need Help??
After a solid night's sleep I managed to come up with the following implementation that generates the permutations in the desired order without a separate sort step:
```#!/usr/bin/perl -w
use strict;

# set up the initial 5 arrays into @a
my @a=([0..2],[0..2],[0..2],[0..2],[0..2]);

# build non-zero versions of those arrays
my @nz=map {[grep {\$_ != 0} @\$_]} @a;

# permute in order....
my @foo;
foreach (15,14,13,11,7,12,10,6,9,5,3,8,4,2,1,0){
push @foo,@{permute('',
(\$_ & 0x01)?\$nz[0]:[0],
(\$_ & 0x02)?\$nz[1]:[0],
\$a[2],
(\$_ & 0x04)?\$nz[3]:[0],
(\$_ & 0x08)?\$nz[4]:[0]);}
}

# print out results
print "\$_\n" for (@foo);

# permute lists recursively
sub permute{
my (\$prefix,\$c,@arrays)=@_;
my @ret=();
foreach(@\$c){
my \$f=\$prefix.\$_;
if(scalar(@arrays)==0){
push @ret,\$f;
}else{
push @ret,@{permute(\$f,@arrays)};
}
}
return \@ret;
}

In reply to Re: How can I improve this? by lhoward
in thread How can I improve this? by Dogg

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

• Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
• Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
• Read Where should I post X? if you're not absolutely sure you're posting in the right place.
• Posts may use any of the Perl Monks Approved HTML tags:
a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
• You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
 For: Use: & & < < > > [ [ ] ]
• Link using PerlMonks shortcuts! What shortcuts can I use for linking?

Create A New User
Chatterbox?
and all is quiet...

How do I use this? | Other CB clients
Other Users?
Others meditating upon the Monastery: (3)
As of 2018-01-21 02:10 GMT
Sections?
Information?
Find Nodes?
Leftovers?
Voting Booth?
How did you see in the new year?

Results (227 votes). Check out past polls.

Notices?