From abca4967c0cb8b9e23df1a1a490566aa9a13440d Mon Sep 17 00:00:00 2001
From: "Jan \"Yenya\" Kasprzak" <kas@fi.muni.cz>
Date: Tue, 14 Dec 2021 06:55:40 +0100
Subject: [PATCH] Day 14: too slow. And no regexes :-(

---
 27.pl | 36 ++++++++++++++++++++++++++++++++++++
 28.pl | 41 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 77 insertions(+)
 create mode 100755 27.pl
 create mode 100755 28.pl

diff --git a/27.pl b/27.pl
new file mode 100755
index 0000000..d07c3ae
--- /dev/null
+++ b/27.pl
@@ -0,0 +1,36 @@
+#!/usr/bin/perl -w
+
+use v5.16;
+
+chomp (my $tmpl = <>);
+scalar <>;
+
+my %r;
+while (<>) {
+	chomp;
+	my ($s1, $s2, $d) = /([A-Z])/g;
+	$r{"$s1$s2"} = "$s1$d$s2";
+}
+
+for (1 .. 10) {
+	my $i = 0;
+	while ($i < length $tmpl) {
+		my $s = substr($tmpl, $i, 2);
+		if ($r{$s}) {
+			substr($tmpl, $i, 2) = $r{$s};
+			$i+=2;
+			next;
+		}
+		$i++;
+	}
+}
+
+my %count;
+for ('A' .. 'Z') {
+	$count{$_} = () = $tmpl =~ /$_/g;
+}
+
+my @count = sort { $a <=> $b } grep { $_ > 0 } values %count;
+
+say $count[-1] - $count[0];
+
diff --git a/28.pl b/28.pl
new file mode 100755
index 0000000..5717759
--- /dev/null
+++ b/28.pl
@@ -0,0 +1,41 @@
+#!/usr/bin/perl -w
+
+use v5.16;
+use List::Util qw(sum0);
+
+chomp (my $tmpl = <>);
+scalar <>;
+
+my (%r1, %r2, %ins);
+while (<>) {
+	chomp;
+	my ($s1, $s2, $d) = /([A-Z])/g;
+	$r1{"$s1$s2"} = "$s1$d";
+	$r2{"$s1$s2"} = "$d$s2";
+	$ins{"$s1$s2"} = $d;
+}
+
+my %count;
+my %p;
+for my $i (0 .. length($tmpl) - 2) {
+	$p{substr($tmpl, $i, 2)}++;
+	$count{substr($tmpl, $i, 1)}++;
+}
+$count{substr($tmpl, -1, 1)}++;
+
+for (1 .. 40) {
+	my %p1;
+	for my $pair (keys %p) {
+		if ($r1{$pair}) {
+			$p1{$r1{$pair}} += $p{$pair};
+			$p1{$r2{$pair}} += $p{$pair};
+			$count{$ins{$pair}} += $p{$pair};
+		}
+	}
+	%p = %p1;
+}
+
+my @count = sort { $a <=> $b } values %count;
+
+say $count[-1] - $count[0];
+
-- 
2.43.0