aoc2021

commit 5c8e94d2fcf4dddc3ce01d3b7c507e1c1876581d
parent 928d2685b89788eb2f61823608fb015c0afdf13f
Author: Samir Parikh <noreply@samirparikh.com>
Date:   Sun, 19 Dec 2021 22:17:29 +0000

update day09-1.pl to provide working solution for Day 09 Part 1

Diffstat:
A
day09-1.pl
 | 
28
++++++++++++++++++++++++++++

1 file changed, 28 insertions(+), 0 deletions(-)
diff --git a/day09-1.pl b/day09-1.pl
@@ -0,0 +1,28 @@
+#!/usr/bin/env perl
+
+use strict;
+use warnings;
+use v5.22;
+use Data::Dumper;
+
+my @heightmap = map{ [m/\d/g, 10] } <>;
+my $columns = @{$heightmap[0]};
+push @heightmap => [ (10) x $columns ];
+my $rows = @heightmap;
+my $risk_level = 0;
+
+foreach my $row (0 .. $rows - 2) {
+  foreach my $column (0 .. $columns - 2) {
+    my $height = $heightmap[$row][$column];
+    my $lowpoint = 1; # true
+    foreach my $offset ([0, -1], [0, 1], [-1, 0], [1, 0]) {
+      if ($height >=
+          $heightmap[$row + $offset->[0]][$column + $offset->[1]]) {
+        $lowpoint = 0; # set to false
+      }
+    }
+    $risk_level += $height + 1 if $lowpoint;
+  }
+}
+
+say $risk_level;