2020, tracking

1 files changed, 30 insertions, 0 deletions

diff --git a/2020/day3/toboggan.pl b/2020/day3/toboggan.pl
new file mode 100644
index 0000000..d424a83
--- /dev/null
+++ b/2020/day3/toboggan.pl
@@ -0,0 +1,30 @@
+use strict;
+use warnings;
+# use Smart::Comments;
+
+open my $fh, '<', "input" or die "no input present, $!";
+
+my $right_m = 3;
+my $toboggan = 0;
+
+my $trees = 0;
+
+while (my $line = <$fh>) {
+    chomp $line;
+
+    ### $line
+    my $curr = substr($line, $toboggan, 1);
+    ### $curr
+
+    if ($curr eq "#") {
+        $trees++;
+    }
+
+    ### $toboggan
+
+    $toboggan = ($toboggan + $right_m) % 31;
+
+}
+
+print($trees);
+