2021-01

2021/01/part1.pm

@@ -0,0 +1,14 @@
+package part1;
+
+use 5.34.0;
+use warnings;
+
+use experimental 'signatures';
+
+use List::AllUtils qw/ sum /;
+
+sub solution(@list) {
+    return sum map { $list[$_] > $list[$_-1] } 1..$#list;
+}
+
+1;

2021/01/part2.pm

@@ -0,0 +1,17 @@
+package part2;
+
+use 5.34.0;
+use warnings;
+use experimental 'signatures';
+
+use List::AllUtils qw/ sum /;
+
+require './part1.pm';
+
+sub solution(@list) {
+    return part1::solution(
+        map { my $i = $_; sum map { $list[$i+$_] } 0..2 } 0..$#list-2
+    );
+}
+
+1;

2021/01/test.t

@@ -0,0 +1,19 @@
+use 5.34.0;
+
+use Test2::V0;
+use Path::Tiny;
+
+require './part1.pm';
+require './part2.pm';
+
+my @list = path('./input')->lines;
+
+subtest part1 => sub {
+    is part1::solution( @list ) => 1602;
+};
+
+subtest part2 => sub {
+    is part2::solution(@list) => 1633;
+};
+
+done_testing();