Day 11: not bad, part 2 was easy

diff --git a/2023/21.pl b/2023/21.pl
new file mode 100755 (executable)
index 0000000..bfc568a
--- /dev/null
+++ b/2023/21.pl
@@ -0,0 +1,36 @@
+#!/usr/bin/perl -w
+
+use v5.38;
+
+my @gxys;
+my $y = 0;
+while (<>) {
+       while (/#/g) {
+               my $x = pos()-1;
+               push @gxys, [ $x, $y ];
+       }
+       $y++;
+}
+
+my %x_gxy = map { $_->[0] => 1 } @gxys;
+my %y_gxy = map { $_->[1] => 1 } @gxys;
+
+my $steps;
+for my $i (0 .. $#gxys-1) {
+       for my $j ($i .. $#gxys) {
+               my ($x1, $y1) = $gxys[$i]->@*;
+               my ($x2, $y2) = $gxys[$j]->@*;
+
+               ($x1, $x2) = ($x2, $x1) if $x1 > $x2;
+               for ($x1+1 .. $x2) {
+                       $steps += $x_gxy{$_} ? 1 : 2;
+               }
+
+               ($y1, $y2) = ($y2, $y1) if $y1 > $y2;
+               for ($y1+1 .. $y2) {
+                       $steps += $y_gxy{$_} ? 1 : 2;
+               }
+       }
+}
+
+say $steps;

diff --git a/2023/22.pl b/2023/22.pl
new file mode 100755 (executable)
index 0000000..83c91c0
--- /dev/null
+++ b/2023/22.pl
@@ -0,0 +1,36 @@
+#!/usr/bin/perl -w
+
+use v5.38;
+
+my @gxys;
+my $y = 0;
+while (<>) {
+       while (/#/g) {
+               my $x = pos()-1;
+               push @gxys, [ $x, $y ];
+       }
+       $y++;
+}
+
+my %x_gxy = map { $_->[0] => 1 } @gxys;
+my %y_gxy = map { $_->[1] => 1 } @gxys;
+
+my $steps;
+for my $i (0 .. $#gxys-1) {
+       for my $j ($i .. $#gxys) {
+               my ($x1, $y1) = $gxys[$i]->@*;
+               my ($x2, $y2) = $gxys[$j]->@*;
+
+               ($x1, $x2) = ($x2, $x1) if $x1 > $x2;
+               for ($x1+1 .. $x2) {
+                       $steps += $x_gxy{$_} ? 1 : 1_000_000;
+               }
+
+               ($y1, $y2) = ($y2, $y1) if $y1 > $y2;
+               for ($y1+1 .. $y2) {
+                       $steps += $y_gxy{$_} ? 1 : 1_000_000;
+               }
+       }
+}
+
+say $steps;