adventofcode/2015/03/houses.pl
Yanick Champoux 09768918b2 day3
2017-12-03 20:28:03 -05:00

23 lines
440 B
Perl

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