adventofcode/21/1.pl

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2017-12-22 16:06:02 +00:00
use 5.20.0;
use Grid::Transform;
my %transform;
my $i = 0;
while(<>) {
chomp;
s/\///g;
my ($from,$to) = split ' => ';
my @from = split '', $from;
my $gt = Grid::Transform->new( \@from, rows => sqrt @from );
for my $t (
map { $_, $_->copy->rotate90, $_->copy->rotate180, $_->copy->rotate270 }
map { $_, $_->copy->flip_vertical } $gt ) {
$transform{ join '', $t->grid} = $to;
}
}
use DDP;
#p %transform;
my @grid = ([qw/ . # . /], [qw/ . . # /], [qw/ # # # /] );
for( 1..5 ) {
my @new_grid;
if( not @grid % 2 ) {
for my $x ( 0..$#grid/2 ) {
for my $y ( 0..$#grid/2 ) {
transform_2(\@grid,\@new_grid,$x,$y);
}
}
}
else {
for my $x ( 0..$#grid/3 ) {
for my $y ( 0..$#grid/3 ) {
transform_3(\@grid,\@new_grid,$x,$y);
}
}
}
say @$_ for @new_grid;
say "\n\n";
@grid = @new_grid;
}
say scalar grep { $_ eq '#' } map { @$_ } @grid;
sub transform_2 {
my ( $grid, $n, $x, $y ) = @_;
warn "$x:$y";
my $k;
for my $i ( 0..1 ) {
for my $j ( 0..1 ) {
$k .= $grid->[2*$x+$i][2*$y+$j];
}
}
my @new = split '', $transform{$k};
warn @new;
my ($r,$c) = ($x,$y);
for my $k ( 0..2 ) {
$n->[3*$r+$k] ||= [];
$n->[3*$r+$k][3*$c+$_] = shift @new for 0..2;
}
}
sub transform_3 {
my ( $grid, $n, $x, $y ) = @_;
my $k;
for my $i ( 0..2 ) {
for my $j ( 0..2 ) {
$k .= $grid->[3*$x+$i][3*$y+$j];
}
}
warn $k;
my @new = split '', $transform{$k};
my ($r,$c) = ($x,$y);
for my $k ( 0..3 ) {
$n->[4*$x+$k] ||= [];
$n->[4*$x+$k][4*$c+$_] = shift @new for 0..3;
}
}