Day 6: simple and fast

[aoc2021.git] / 11.pl

diff --git a/11.pl b/11.pl
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+++ b/11.pl
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+#!/usr/bin/perl -w
+
+use v5.16;
+
+my @timers;
+
+for (split /,/, <>) {
+       $timers[$_]++;
+}
+
+my $days = 80;
+
+while ($days--) {
+       my $zero = shift @timers;
+       $timers[6]+=$zero;
+       $timers[8]+=$zero;
+}
+
+my $sum = 0;
+$sum += $_ for @timers;
+
+say $sum;
+
+       
+