From cca063e244ae7183e0df93985d4abcede8974522 Mon Sep 17 00:00:00 2001
From: "Jan \"Yenya\" Kasprzak" <kas@fi.muni.cz>
Date: Sun, 3 Dec 2023 07:21:44 +0100
Subject: [PATCH] Day 3: quite ugly code

---
 2023/05.pl | 51 ++++++++++++++++++++++++++++++++++++++++++++++
 2023/06.pl | 59 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 110 insertions(+)
 create mode 100755 2023/05.pl
 create mode 100755 2023/06.pl

diff --git a/2023/05.pl b/2023/05.pl
new file mode 100755
index 0000000..3882c0b
--- /dev/null
+++ b/2023/05.pl
@@ -0,0 +1,51 @@
+#!/usr/bin/perl -w
+
+use v5.38;
+use experimental 'multidimensional', 'for_list', 'builtin';
+use builtin 'indexed';
+use List::Util;
+use Y::AoC::Task;
+$; = ';';
+# t;
+
+my @map = map { chomp; [ split // ] } <>;
+my $xmax = @{ $map[0] };
+my $ymax = @map;
+
+my $sum;
+
+my %seen;
+
+for my $y (0 .. $ymax-1) {
+for my $x (0 .. $xmax-1) {
+	my $n = $map[$y][$x];
+	next if $n !~ /\d/ || $seen{$x,$y}++;
+	my $dx = 1;
+	my $is_neigh = 0;
+	if ($x > 0) {
+		if ($y > 0 && $map[$y-1][$x-1] !~ /\./) { $is_neigh = 1; }
+		if ($map[$y][$x-1] !~ /\./) { $is_neigh = 1; }
+		if ($y < $ymax-1 && $map[$y+1][$x-1] !~ /\./) { $is_neigh = 1; }
+	}
+	say "First $is_neigh";
+	if ($y > 0 && $map[$y-1][$x] !~ /\./) { $is_neigh = 1; }
+	if ($y < $ymax-1 && $map[$y+1][$x] !~ /\./) { $is_neigh = 1; }
+	while ($x+$dx < $xmax && $map[$y][$x+$dx] =~ /\d/) {
+		$n*=10; $n+= $map[$y][$x+$dx];
+		say "First $is_neigh at ", $x+$dx;
+		if ($y > 0 && $map[$y-1][$x+$dx] !~ /\./) { say $y-1, " ", $x+$dx; $is_neigh = 1; }
+		if ($y < $ymax-1 && $map[$y+1][$x+$dx] !~ /\./) { $is_neigh = 1; }
+		$seen{$x+$dx,$y} = 1;
+		$dx++;
+	}
+	say "Before last $is_neigh at ", $x+$dx;
+	if ($x + $dx < $xmax) {
+		if ($y > 0 && $map[$y-1][$x+$dx] !~ /\./) { say $y-1, " ", $x+$dx; $is_neigh = 1; }
+		if ($y < $ymax-1 && $map[$y+1][$x+$dx] !~ /\./) { $is_neigh = 1; }
+		if ($x+$dx < $xmax-1 && $map[$y][$x+$dx] !~ /\./) { $is_neigh = 1; }
+	}
+	$sum += $n if $is_neigh;
+	if ($is_neigh) { say "$n at $x,$y" }
+} }
+
+say $sum;
diff --git a/2023/06.pl b/2023/06.pl
new file mode 100755
index 0000000..12992b0
--- /dev/null
+++ b/2023/06.pl
@@ -0,0 +1,59 @@
+#!/usr/bin/perl -w
+
+use v5.38;
+use experimental 'multidimensional', 'for_list', 'builtin';
+use builtin 'indexed';
+use List::Util;
+use Y::AoC::Task;
+$; = ';';
+# t;
+
+my @map = map { chomp; [ split // ] } <>;
+my $xmax = @{ $map[0] };
+my $ymax = @map;
+
+my $sum;
+my %seen;
+my %gear;
+
+sub test_sym {
+	my ($prev, $x, $y, @d) = @_;
+	for my ($dx, $dy) (@d) {
+		my ($nx, $ny) = ($x+$dx, $y+$dy);
+		next if $nx < 0 || $nx >= $xmax || $ny < 0 || $ny >= $ymax;
+		if ($map[$ny][$nx] eq '*') {
+			$$prev = [$nx, $ny];
+		}
+	}
+}
+
+for my $y (0 .. $ymax-1) {
+for my $x (0 .. $xmax-1) {
+	my $n = $map[$y][$x];
+	next if $n !~ /\d/ || $seen{$x,$y}++;
+	my $dx = 1;
+	while ($x+$dx < $xmax && $map[$y][$x+$dx] =~ /\d/) {
+		$n*=10; $n+= $map[$y][$x+$dx];
+		$seen{$x+$dx,$y} = 1;
+		$dx++;
+		say "$n at $x..", $x+$dx, ", $y";
+	}
+	my $sym;
+	for my $x1 (-1 .. $dx) {
+		test_sym(\$sym, $x, $y, $x1, -1, $x1, 0, $x1, +1);
+	}
+	if (defined $sym) {
+		my ($sx, $sy) = @$sym;
+		push @{ $gear{$sx,$sy} }, $n;
+		say "Star at $sx, $sy";
+	}
+} }
+
+
+for my $k (keys %gear) {
+	my @coords = @{ $gear{$k} };
+	next if @coords != 2;
+	$sum += $coords[0] * $coords[1];
+}
+
+say $sum;
-- 
2.43.0