comment on

#!perl
# labir.pl -- maze generator
# Copyright (C) Zsban Ambrus 2001--2009
use warnings; use strict; use 5.010;
my $W = 35;
my $H = 19;
my @a = ([(1)x(3+2*$W)], map({ [1, (0)x(1+2*$W), 1] } 1 .. 1+2*$H), [(
+1)x(3+2*$W)]);
for my $u (0 .. $H-1) {
    for my $v (0 .. $W-1) {
        $a[2+2*$u][2+2*$v] = 1;
    }
}
my @y = (-1)x($W*$H);
my $C; $C = sub {
    no warnings "recursion";
    my($v) = @_;
    my $w = $y[$v];
    if ($w < 0) {
        return $v;
    } else {
        my $z = &$C($w);
        $y[$v] = $z;
        return $z;
    }
};
my $U = sub {
    my($u, $v) = @_;
    my($c, $d) = (&$C($u), &$C($v));
    $c != $d and
        $y[$c] = $d;
};
while (&$C(0) != &$C($W*$H-1)) {
    my $a = 1 < rand(2);
    my $x = int(rand($H));
    my $y = int(rand($W));
    $a ? $y < $W - 1 : $x < $H - 1 or next;
    my ($u, $v) = (($x+!$a)*$W+($y+$a), $x*$W+$y);
    &$C($u) != &$C($v) || rand(5) < 1 or next; # here's the magic
    &$U($u, $v);
    $a[2+!$a+2*$x][2+$a+2*$y] = 1;
}
for my $r (1 .. 1+2*$H) {
    for my $c (1 .. 1+2*$W) {
        my $o = $a[$r][$c];
        my $v = $a[$r-1][$c] && $a[$r+1][$c];
        my $h = $a[$r][$c-1] && $a[$r][$c+1];
        print(
            2 == $r && 2 == $c ? "@" :
            2*$H == $r && 1+2*$W == $c ? ">" :
            $o ? " " :
            $v ? ($h ? " " : "-") :
            ($h ? "|" : "+")
        );
    }
    print "\n";
}
__END__
[download]

Here's an example output.

+-------+---+---+-----+---+-----+-+-+-----+-------+-+-+---+---------+-
++
|@      |   |   |     |   |     | | |     |       | | |   |         | 
+|
+-- | +-+---+-- | ----+ | | --- | | +-+ +-+-+-+---+ +-+ | | | +---+-+ 
+|
|   | | |             | | |     | |   | | | | |     |   | | | |   |   
+|
+-+ +-+-+ | --+-+-+   +-+ | +-+ +-+-+ | | +-+ | --+ +-- +-+ +-+-+ | --
++
| |       |   | | |   |     | | | | | | |   | |   |           | |     
+|
+-+ | --+-+-+-+-+ | --+ ----+-+-+-+ +-+ +-- +-+---+ +-- +-- --+-+-- | 
+|
|   |   | | |         |       | | | | | |           |   |     | |   | 
+|
+---+ | +-+-+-----+   | | +-+-+-+-+-+ | +-+ +-- | | +-+-+-- +-+ | --+-
++
|   | |   | |     |     | | |   | |   |   | |   | | | |     | |       
+|
| --+ +---+ +-+ +-+ --+ +-+-+-+ +-+ +-+-+-+ | --+-+ | | +---+ | | +-+ 
+|
|             | |     |   | | |     | | |   |   | |   | |     | | | | 
+|
+-+-- +-+ | +-+ +-+-- +-+-+-+ +-+   | +-+-- +-+-+-+-+-+-+ | +-+ +-+ +-
++
| |   | | | |     |     | |     |     | |   | | | | |     | | |   | | 
+|
| +-- +-+ +-+-+-- +-+ | +-+ +-- +-- --+ +---+ | +-+-+ | | +-+ | --+ | 
+|
|       | |   |     | |   | |                   | | | | | |         | 
+|
| +---+-+-+-- +-+ --+ | | +-+-- | | | +-+ | +-+ | | +-+-+ +-+ ----+ +-
++
| |   | |       |     | | |     | | | | | | | |   | |   |   |     | | 
+|
+-+-+ +-+-+-+ | +-- | +-+ | | --+-+-+-+-+ +-+ +-+-+ | +-+ --+ | | | +-
++
| | |     | | | |   |   | | |   |     |   |     |   | |     | | |   | 
+|
+-+ +-+-- +-+-+ +-+-+---+ +-+-- | ----+-+ | +-- +-+ | |   --+ | +---+ 
+|
|   | |   |     | |     | |           | | | |   | |                   
+|
+-+ +-+---+ +-- | +-+-+ | | +-------- +-+ | +-+ +-+ +-+ | +-+---- ----
++
| |   |     |   |   | | |   |             |   |     | | | | |         
+|
| | --+ | --+ | | --+ | +-- +---+ --+ +-- | --+-----+-+-+ | | | | | +-
++
| |   | |     |     |   |       |   | |   |         | | | |   | | | | 
+|
+-+ | +-+-----+---- +-+-+   | --+---+-+-+ | +---+---+ +-+ +-+-+-+ | | 
+|
| | | | |     |     | |     |       | | |   |   |   |   | | | | | | | 
+|
| | +-+-+ +-- +-- --+-+ | | +---+ --+ +-+ | | +-+-+-+ | | | | | +-+ | 
+|
|     | | |         | | | | |   |   | |   | | |   |   | | |   | | | | 
+|
+-+ +-+-+ +---------+ | +-+-+ --+ --+ | +-+-+-+ | +-+-+ | | +-+ | | | 
+|
| | | |   |         | | | |             | |     | | |   |   |   | |   
+|
| | | | | | +-----+-+-+ | | | ----+ +-+-+-+ | +-+-+ | | +-+ +-- | | | 
+|
|   |   | | |     | |     | |     | | |   | | | |   | |   |     |   | 
+|
|   +---+-+-+ | | | +---- +-+ ----+-+ +-+-+-+ | +-- | +-+ +-+-- +-- | 
+|
|   |         | |                 |   | |   | | |       |   |   |   | 
+|
+-+ +-- --+---+-+ +-+-- +-+-- --+-+-- | | | | +-+ +-+-+-+ --+ +-+-+-+ 
+|
| |       |     | | |   | |     | |   |   | |   | | | | |   | | | | | 
+>
+-+-------+-----+-+-+---+-+-----+-+---+---+-+---+-+-+-+-+---+-+-+-+-+-
++
[download]

In reply to Random maze generator by ambrus

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.


Clear questions and runnable code get the best and fastest answer
	PerlMonks