From 354065185a5065f5c22bdd800f355686b4f0b86e Mon Sep 17 00:00:00 2001
From: "Jan \"Yenya\" Kasprzak" <kas@fi.muni.cz>
Date: Thu, 15 Dec 2022 08:03:38 +0100
Subject: [PATCH] Day 15: first ugly naive working solution

---
 2022/29.pl | 44 +++++++++++++++++++++++++++++++++++++++++
 2022/30.pl | 57 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 101 insertions(+)
 create mode 100755 2022/29.pl
 create mode 100755 2022/30.pl

diff --git a/2022/29.pl b/2022/29.pl
new file mode 100755
index 0000000..71896f3
--- /dev/null
+++ b/2022/29.pl
@@ -0,0 +1,44 @@
+#!/usr/bin/perl -w
+
+use v5.36;
+use strict;
+use experimental 'multidimensional';
+
+my $row = 2000000;
+
+my @ints;
+
+my %corr;
+
+while (<>) {
+	my ($sx, $sy, $cx, $cy) = /(-?\d+)/g;
+	my $r = abs($sx - $cx) + abs($sy - $cy);
+	my $dist = abs($sy - $row);
+	say "dist =$dist";
+	if ($dist < $r) {
+		my $l = abs($dist-$r);
+		push @ints, [ $sx - ($r - $dist), $sx + ($r - $dist) ];
+		say "$ints[-1][0] $ints[-1][1]";
+		$corr{$cx} = 1 if $cy == $row;
+	}
+}
+
+@ints = sort { $a->[0] <=> $b->[0] } @ints;
+my $prev = shift @ints;
+my $sum = $prev->[1] - $prev->[0] + 1;
+
+for my $int (@ints) {
+	if ($int->[0] > $prev->[1]) {
+		$sum += $int->[1] - $int->[0] + 1;
+		$prev = $int;
+	} elsif ($int->[1] <= $prev->[1]) {
+		next;
+	} else {
+		$sum += $int->[1] - $prev->[1];
+		$prev = $int;
+	}
+}
+
+say $sum - keys %corr;
+		
+
diff --git a/2022/30.pl b/2022/30.pl
new file mode 100755
index 0000000..3dc0e5f
--- /dev/null
+++ b/2022/30.pl
@@ -0,0 +1,57 @@
+#!/usr/bin/perl -w
+
+use v5.36;
+use strict;
+use experimental 'multidimensional';
+
+my $row = 2000000;
+my $max = 4000000;
+
+my @input = <>;
+
+sub compute_row($row) {
+	my @ints;
+	my %corr;
+
+	for (@input) {
+		my ($sx, $sy, $cx, $cy) = /(-?\d+)/g;
+		my $r = abs($sx - $cx) + abs($sy - $cy);
+		my $dist = abs($sy - $row);
+		# say "dist =$dist";
+		if ($dist < $r) {
+			my ($l, $r) = ($sx - ($r - $dist), $sx + ($r - $dist));
+			next if $r < 0 || $l > $max;
+			$l = 0 if $l < 0;
+			$r = $max if $r > $max;
+			push @ints, [$l, $r];
+			# say "$ints[-1][0] $ints[-1][1]";
+			$corr{$cx} = 1 if $cy == $row;
+		}
+	}
+
+	@ints = sort { $a->[0] <=> $b->[0] } @ints;
+	my $prev = shift @ints;
+	if ($prev->[0]) {
+		say "at 0 $row";
+		exit 0;
+	}
+	my $sum = $prev->[1] - $prev->[0] + 1;
+
+	for my $int (@ints) {
+		if ($int->[0] < $max && $int->[0] > $prev->[1]+1) {
+			say "at ", $prev->[1]+1, " $row: ", 4000000*($prev->[1]+1)+$row;
+			exit 0;
+		} elsif ($int->[1] <= $prev->[1]) {
+			next;
+		} else {
+			$prev = $int;
+		}
+		last if $prev->[1] > $max;
+	}
+}
+
+for (1 .. $max) {
+	compute_row($_);
+	say "row $_" if $_ % 1000 == 0;
+}
+
-- 
2.43.0