#!/usr/bin/perl
use warnings;
package Polyomino;
use utf8;
sub new($)
{
my $class=shift;
my $string=shift;
return bless \$string, $class;
}
sub canonize()
{
my $self=shift;
my $str=my $strMin=$$self;
for(1..$self->perimeter)
{
$str=~s/^(.)(.*)$/$2$1/;
for(1..4)
{
$str=~tr/RULD/ULDR/;
$strMin=$str if $strMin gt $str;
}
}
$$self=$strMin;
}
sub offshut($)
{
my $self=shift;
my $n=shift;
my $polyomino=__PACKAGE__->new($$self);
my $c=substr($$polyomino, $n, 1);
substr($$polyomino, $n, 1, {R=>'DRU', L=>'ULD', U=>'RUL', D=>'LDR'}->{$c});
while
(
$$polyomino=~s/RL|UD|DU|LR//g
or $$polyomino=~s/^R(.*)L$/$1/
or $$polyomino=~s/^L(.*)R$/$1/
or $$polyomino=~s/^U(.*)D$/$1/
or $$polyomino=~s/^D(.*)U$/$1/
)
{}
undef $polyomino unless $polyomino->isSimple;
$polyomino->canonize if defined $polyomino;
return $polyomino;
}
sub toString()
{
my $self=shift;
return $$self;
}
sub boundingBox()
{
my $self=shift;
my ($llx, $lly, $urx, $ury)=(0, 0, 0, 0);
my ($x, $y)=(0, 0);
for(split //, $$self)
{
if($_ eq 'R') { $x++; }
elsif($_ eq 'U') { $y++; }
elsif($_ eq 'L') { $x--; }
elsif($_ eq 'D') { $y--; }
$llx=$x if $llx>$x;
$lly=$y if $lly>$y;
$urx=$x if $urx<$x;
$ury=$y if $ury<$y;
}
return ($llx, $lly, $urx, $ury);
}
sub toSVG()
{
my $self=shift;
my ($llx, $lly, $urx, $ury)=$self->boundingBox;
my @viewBox=($llx-.5, -$ury-.5, $urx-$llx+1, $ury-$lly+1);
my $cellSize=36;
$_*=$cellSize for @viewBox;
my ($width, $height)=@viewBox[2, 3];
my $path='';
while($$self=~m/((.)\2*)/g)
{
$path.={R=>'h ', U=>'v -', L=>'h -', D=>'v '}->{$2}
.($cellSize*length $1).' ';
}
return <<__SVG__;
__SVG__
}
sub toASCII()
{
my $self=shift;
my ($i, $j)=$self->boundingBox;
($i, $j)=(-$i, -$j);
my @intersections;
for my $c(split //, $$self)
{
if($c eq 'R')
{
$i++;
}
elsif($c eq 'U')
{
push @{$intersections[$j++]}, $i;
}
elsif($c eq 'L')
{
$i--;
}
elsif($c eq 'D')
{
push @{$intersections[--$j]}, $i;
}
}
my $string='';
for(reverse @intersections)
{
my @row=sort { $a<=>$b } @$_;
my $rowString='';
while(@row)
{
my ($start, $stop)=splice @row, 0, 2;
$rowString.=(' ' x ($start-length $rowString));
$rowString.=('▒' x ($stop-$start));
}
$string.="$rowString\n";
}
return $string;
}
sub perimeter()
{
my $self=shift;
return length $$self;
}
sub isSimple()
{
my $self=shift;
my $perimeter=$self->perimeter;
for(my $k=1; $k<$perimeter; $k++)
{
for(my $l=4; $l<=$perimeter-12; $l+=2)
{
my $subpath=substr($$self x 2, $k, $l);
return 0 if
($subpath=~tr/R//)==($subpath=~tr/L//)
and ($subpath=~tr/U//)==($subpath=~tr/D//)
}
}
return 1;
}
##################################################
package main;
use open IO=>':locale';
use open ':std';
use Getopt::Long;
use IO::File;
sub findPolyominoes($);
sub findPolyominoes($)
{
my $n=shift;
return (Polyomino->new('DRUL')) if $n==1;
my %polyominoes;
for(findPolyominoes($n-1))
{
for(my $k=0; $k<$_->perimeter; $k++)
{
my $polyomino=$_->offshut($k);
$polyominoes{$polyomino->toString}=$polyomino
if defined $polyomino;
}
}
return sort {$a->toString cmp $b->toString} values %polyominoes;
}
sub toXHTMLFile($;$)
{
my $n=shift;
my $fileName=shift;
my $file=$fileName eq '-'? STDOUT: IO::File->new($fileName, '>:utf8');
$file->print(<<__XHTML__);
$n-полимино
__XHTML__
my $i=0;
for(findPolyominoes($n))
{
$file->print
(
"\n",
"| ", $i++, " | \n",
"\n", $_->toSVG, " | \n",
"", $_->toString, " | \n",
"
\n"
);
}
$file->print(<<__XHTML__);
__XHTML__
}
sub toASCIIFile($;$)
{
my $n=shift;
my $fileName=shift;
my $file=$fileName eq '-'? STDOUT: IO::File->new($fileName, '>');
my $i=0;
for(findPolyominoes($n))
{
$file->print
(
'=' x $n, ' ',
$i++, "\t[$$_]\n",
$_->toASCII
);
}
}
sub help()
{
STDERR->print(<<__HELP__);
polyomino.pl ⟨опции⟩ ⟨число⟩
⟨опции⟩:
-o, --output-file ⟨файл⟩
файл для вывода
-f, --format ⟨формат⟩
формат вывода, XHTML или ASCII
-h
показать эту подсказку
⟨число⟩:
натуральное число
__HELP__
exit;
}
##########
my %options;
GetOptions
(
'o|output-file=s'=>\$options{'output-file'},
'f|format=s'=>\$options{'format'},
'h|help!'=>\$options{'help'},
);
my $n=shift or help;
$options{'output-file'}=$options{'output-file'}//'-';
$options{'format'}=$options{'format'}//'ASCII';
unless(defined $options{'format'})
{
help;
}
elsif($options{'format'} eq 'XHTML')
{
toXHTMLFile($n, $options{'output-file'});
}
elsif($options{'format'} eq 'ASCII')
{
toASCIIFile($n, $options{'output-file'});
}
else
{
help;
}