Algorithm::Loops' NestedLoops allows a non-recursive implementation:
use Algorithm::Loops 'NestedLoops';
sub find_path {
my ($adj_list, $length) = @_;
my %been_there;
NestedLoops([
[sort {$a <=> $b} keys %$adj_list],
(sub {
# The last value on @_ has just changed, so remove it from %be
+en_there
# and set the new one
my ($last_position, $last_value) = ($#_, $_[-1]);
delete $been_there{$_} for grep $been_there{$_} >= $last_posit
+ion, keys %been_there;
$been_there{$last_value} = $last_position;
# Here I grep out the already-visited nodes, but you could als
+o exclude
# any letters that don't result in prefixes of real words.
[ grep !defined($been_there{$_}), @{$adj_list->{$last_value}}
+]
}) x ($length-1)]
);
}
my $i = find_path(\%adjacency_list, 3);
my @path;
print "@path\n" while @path = $i->();
Caution: Contents may have been coded under pressure.
-
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.
|