Year 2015

[aoc.git] / 2015 / 05.pl

diff --git a/2015/05.pl b/2015/05.pl
new file mode 100755 (executable)
index 0000000..270a002
--- /dev/null
+++ b/2015/05.pl
@@ -0,0 +1,22 @@
+#!/usr/bin/perl -w
+
+use v5.16;
+use strict;
+
+$_ = <>;
+
+my ($x, $y) = (0, 0);
+$; = ',';
+my %seen = ("0,0" => 1);
+
+for my $v (split //) {
+       $x++ if $v eq '>';
+       $y++ if $v eq 'v';
+       $x-- if $v eq '<';
+       $y-- if $v eq '^';
+       $seen{$x,$y}++;
+}
+
+say scalar keys %seen;
+       
+