From 64224851df1f7b48c3affb287f579e17eab80b5a Mon Sep 17 00:00:00 2001
From: "Jan \"Yenya\" Kasprzak" <kas@fi.muni.cz>
Date: Fri, 24 Dec 2021 07:37:35 +0100
Subject: [PATCH] Day 24: brute force on many CPUs

---
 47.pl | 64 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 48.pl | 66 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 130 insertions(+)
 create mode 100755 47.pl
 create mode 100755 48.pl

diff --git a/47.pl b/47.pl
new file mode 100755
index 0000000..84034ae
--- /dev/null
+++ b/47.pl
@@ -0,0 +1,64 @@
+#!/usr/bin/perl -w
+
+use v5.16;
+
+my @ins = map { chomp; [ split /\s+/ ] } <STDIN>;
+
+my %regs = (
+	x => 0,
+	y => 0,
+	z => 0,
+	w => 0,
+);
+
+# my @inp = split //, 13579246899999;
+# my @inp = (-10, 3);
+
+my %cache;
+
+sub calculate {
+	my ($ip, %regs) = @_;
+
+	my $key = join(',', $ip, $regs{w}, $regs{x}, $regs{y}, $regs{z});
+	return if $cache{$key}++;
+
+	say "calculate $ip $regs{q}"
+		if length($regs{q}) < 5;
+	while ($ip < @ins) {
+		my ($ins, $r1, $r2) = @{ $ins[$ip] };
+		my $v2 = (defined $r2 && $r2 =~ /[w-z]/) ? $regs{$r2} : $r2;
+		if ($ins eq 'inp') {
+			if (!length($regs{q})) {
+				$regs{q} = $regs{$r1} = shift @ARGV;
+				say "calculate for $regs{q}";
+			} else {
+				for my $val (reverse '1' .. '9') {
+					$regs{$r1} = $val;
+					calculate($ip+1, %regs, q => $regs{q} . $val);
+				}
+			}
+		} elsif ($ins eq 'add') {
+			$regs{$r1} += $v2;
+		} elsif ($ins eq 'mul') {
+			$regs{$r1} *= $v2;
+		} elsif ($ins eq 'div') {
+			$regs{$r1} /= $v2;
+			$regs{$r1} = $regs{$r1} > 0 ? int($regs{$r1}) : -int(-$regs{$r1});
+		} elsif ($ins eq 'mod') {
+			$regs{$r1} %= $v2;
+		} elsif ($ins eq 'eql') {
+			$regs{$r1} = $regs{$r1} == $v2 ? 1 : 0;
+		}
+
+		# say join(' ', $ip, @{ $ins[$ip] }), "\n\tw=$regs{w} x=$regs{x} y=$regs{y} z=$regs{z}";
+		$ip++;
+	}
+	if ($regs{z} == 0) {
+		say "accepted $regs{q}";
+sleep 100_000;
+		exit 0;
+	}
+}
+
+calculate (0, %regs);
+
diff --git a/48.pl b/48.pl
new file mode 100755
index 0000000..6aa9060
--- /dev/null
+++ b/48.pl
@@ -0,0 +1,66 @@
+#!/usr/bin/perl -w
+
+use v5.16;
+
+my @ins = map { chomp; [ split /\s+/ ] } <STDIN>;
+
+my %regs = (
+	x => 0,
+	y => 0,
+	z => 0,
+	w => 0,
+	q => '',
+);
+
+# my @inp = split //, 13579246899999;
+# my @inp = (-10, 3);
+
+my %cache;
+
+sub calculate {
+	my ($ip, %regs) = @_;
+
+	my $key = join(',', $ip, $regs{w}, $regs{x}, $regs{y}, $regs{z});
+	return if $cache{$key}++;
+
+	say "calculate $ip $regs{q}"
+		if length($regs{q}) < 5;
+	while ($ip < @ins) {
+		my ($ins, $r1, $r2) = @{ $ins[$ip] };
+		my $v2 = (defined $r2 && $r2 =~ /[w-z]/) ? $regs{$r2} : $r2;
+		if ($ins eq 'inp') {
+			my $v = shift @ARGV;
+			if (defined $v) {
+				$regs{q} .= $regs{$r1} = $v;
+				say "calculate for $regs{q}";
+			} else {
+				for my $val ('1' .. '9') {
+					$regs{$r1} = $val;
+					calculate($ip+1, %regs, q => $regs{q} . $val);
+				}
+			}
+		} elsif ($ins eq 'add') {
+			$regs{$r1} += $v2;
+		} elsif ($ins eq 'mul') {
+			$regs{$r1} *= $v2;
+		} elsif ($ins eq 'div') {
+			$regs{$r1} /= $v2;
+			$regs{$r1} = $regs{$r1} > 0 ? int($regs{$r1}) : -int(-$regs{$r1});
+		} elsif ($ins eq 'mod') {
+			$regs{$r1} %= $v2;
+		} elsif ($ins eq 'eql') {
+			$regs{$r1} = $regs{$r1} == $v2 ? 1 : 0;
+		}
+
+		# say join(' ', $ip, @{ $ins[$ip] }), "\n\tw=$regs{w} x=$regs{x} y=$regs{y} z=$regs{z}";
+		$ip++;
+	}
+	if ($regs{z} == 0) {
+		say "accepted $regs{q}";
+sleep 100_000;
+		exit 0;
+	}
+}
+
+calculate (0, %regs);
+
-- 
2.43.5