aoc2021

commit bb3b36bbe05a9542e4d58a6121801734fa2b1b14
parent 9e04b14633f111fba29d08216bbe54fef87f1b77
Author: Samir Parikh <noreply@samirparikh.com>
Date:   Wed,  1 Dec 2021 21:52:15 +0000

add Day 01 Part 1 and Part 2 solutions as 1 file

Diffstat:
A
day01.pl
 | 
29
+++++++++++++++++++++++++++++

1 file changed, 29 insertions(+), 0 deletions(-)
diff --git a/day01.pl b/day01.pl
@@ -0,0 +1,29 @@
+#!/usr/bin/env perl
+
+use strict;
+use warnings;
+use v5.22;
+use diagnostics;
+
+if (@ARGV !=1) {
+    die "Usage: $0 [input-filename]";
+}
+
+my $input_filename = $ARGV[0];
+open my $filehandle, '<', $input_filename or
+    die "Could not open input file $input_filename: $!";
+
+chomp( my @input = ( <$filehandle> ) );
+
+# Part 1
+say scalar( grep { $input[$_] > $input[$_ - 1] } (1 .. $#input) );
+
+# Part 2
+say scalar(
+    grep {
+        my $overlap       = $input[$_] + $input[$_ + 1];
+        my $first_window  = $overlap + $input[$_ - 1];
+        my $second_window = $overlap + $input[$_ + 2];
+        $second_window > $first_window
+    } (1 .. $#input - 2)
+);