Moved 2021 to a subdir

[aoc.git] / 2021 / 12.pl

diff --git a/2021/12.pl b/2021/12.pl
new file mode 100755 (executable)
index 0000000..990aac6
--- /dev/null
+++ b/2021/12.pl
@@ -0,0 +1,25 @@
+#!/usr/bin/perl -w
+
+use v5.16;
+
+my @timers;
+
+for (split /,/, <>) {
+       $timers[$_]++;
+}
+
+my $days = 256;
+
+while ($days--) {
+       my $zero = shift @timers;
+       $timers[6]+=$zero;
+       $timers[8]+=$zero;
+}
+
+my $sum = 0;
+$sum += $_ for @timers;
+
+say $sum;
+
+       
+