adventofcode/2015/03/houses2.pl

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Perl
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2017-12-04 01:28:03 +00:00
use 5.20.0;
my %directions = (
'v' => [ 0, 1 ],
'^' => [ 0, -1 ],
'<' => [ 1, 0 ],
'>' => [ -1, 0 ],
);
my @last = ([0,0],[0,0]);
my @positions = (
[0,0],
map {
my $last = shift @last;
my @this = ( $last->[0] + $_->[0], $last->[1] + $_->[1] );
push @last, \@this;
\@this;
}
map { $directions{$_} } split '', <> );
use List::AllUtils qw/ uniq /;
@positions = uniq map { join ':', @$_ } @positions;
say scalar @positions;