From 156c1de3608eedbe19490679d01b39f89aea53da Mon Sep 17 00:00:00 2001
From: "Jan \"Yenya\" Kasprzak" <kas@fi.muni.cz>
Date: Fri, 8 Dec 2023 08:29:42 +0100
Subject: [PATCH] Day 8: ugly and generally incorrect first working solution

---
 2023/15.pl | 28 ++++++++++++++++++++++++++++
 2023/16.pl | 45 +++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 73 insertions(+)
 create mode 100755 2023/15.pl
 create mode 100755 2023/16.pl

diff --git a/2023/15.pl b/2023/15.pl
new file mode 100755
index 0000000..e003111
--- /dev/null
+++ b/2023/15.pl
@@ -0,0 +1,28 @@
+#!/usr/bin/perl -w
+
+use v5.38;
+
+$/ = "\n\n";
+my %dirs;
+my @steps = split //, scalar <>;
+pop @steps;
+pop @steps;
+my $l = <>;
+for (split /\n/, $l) {
+	my @x = /[A-Z]{3}/g;
+	$dirs{$x[0].'L'} = $x[1];
+	$dirs{$x[0].'R'} = $x[2];
+}
+
+my %seen;
+my $now = 'AAA' . $steps[0];
+my $i = 0;
+my $n;
+while ($now !~ /^ZZZ/) {
+	say $now;
+	$i ++;
+	$i = 0 if $i >= @steps;
+	$now = $dirs{$now}.$steps[$i];
+	$n++;
+}
+say $n;
diff --git a/2023/16.pl b/2023/16.pl
new file mode 100755
index 0000000..5e7f823
--- /dev/null
+++ b/2023/16.pl
@@ -0,0 +1,45 @@
+#!/usr/bin/perl -w
+
+use v5.38;
+
+$/ = "\n\n";
+my %dirs;
+my @steps = split //, scalar <>;
+pop @steps;
+pop @steps;
+my $l = <>;
+for (split /\n/, $l) {
+	my @x = /[A-Z0-9]{3}/g;
+	$dirs{$x[0].'L'} = $x[1];
+	$dirs{$x[0].'R'} = $x[2];
+}
+
+my %seen;
+my %now = map { substr($_, 0, 3) . $steps[0] => 1 } grep { /^..A/ } keys %dirs;
+my @now = keys %now;
+say join(' ', @now);
+
+sub walk {
+	my $node = shift;
+	my $i = 0;
+	my $n;
+	while ($node !~ /^..Z/) {
+		$i++;
+		$i = 0 if $i >= @steps;
+		$node = $dirs{$node} . $steps[$i];
+	$n++;
+	}
+	return $n;
+}
+
+my %f;
+use List::Util qw(product);
+for (@now) {
+	my $st = walk($_);
+	my $l = `factor $st`;
+	$l =~ s/.*://;
+	for my $n ($l =~ /\d+/g) {
+		$f{$n}++;
+	}
+}
+say product keys %f;
-- 
2.43.5