2023-01

2023/01/Part1.pm

@@ -0,0 +1,16 @@
+use 5.38.0;
+
+package Part1;
+
+use List::AllUtils qw/ sum /;
+
+sub extract_number ($line) {
+    my @n = $line =~ /(\d)/g;
+    return join "", $n[0], $n[-1];
+}
+
+sub solution_1 ($input) {
+    sum map { extract_number($_) } split "\n", $input;
+}
+
+1;

2023/01/Part2.pm

@@ -0,0 +1,33 @@
+use 5.38.0;
+
+package Part2;
+
+use Part1;
+
+use List::AllUtils qw/ sum /;
+
+my %spelled = (
+    one   => 1,
+    two   => 2,
+    three => 3,
+    four  => 4,
+    five  => 5,
+    six   => 6,
+    seven => 7,
+    eight => 8,
+    nine  => 9,
+);
+
+sub resolve_spelled_numbers ($line) {
+    my $re = join '|', keys %spelled, 1 .. 9;
+
+    join "", map { $spelled{$_} // $_ } $line =~ /^.*?($re)/g,
+      $line =~ /^.*($re)/g;
+}
+
+sub solution_2 ($input) {
+    sum map { Part1::extract_number($_) }
+      map { resolve_spelled_numbers($_) } split "\n", $input;
+}
+
+1;

2023/01/test.t

@@ -0,0 +1,49 @@
+use 5.38.0;
+
+use Test2::V0;
+
+use Path::Tiny;
+
+use Part1;
+use Part2;
+
+my $input = path('input')->slurp;
+
+my %sample = (
+    '1abc2'     => 12,
+    pqr3stu8vwx => 38,
+    a1b2c3d4e5f => 15,
+    treb7uchet  => 77
+);
+
+for my ( $line, $expected ) (%sample) {
+    is Part1::extract_number($line) => $expected;
+}
+
+is Part1::solution_1($input) => 56397;
+
+subtest 'part 2' => sub {
+
+    is Part2::resolve_spelled_numbers("sixsixsix") => 66;
+
+    %sample = (
+        'two1nine'         => 29,
+        eightwothree       => 83,
+        abcone2threexyz    => 13,
+        xtwone3four        => 24,
+        '4nineeightseven2' => 42,
+        zoneight234        => 14,
+        '7pqrstsixteen'    => 76,
+        'twothreefour'     => 24,
+    );
+
+    for my ( $line, $expected ) (%sample) {
+        is Part1::extract_number( Part2::resolve_spelled_numbers($line) ) =>
+          $expected;
+    }
+
+    is Part2::solution_2($input) => 55701;
+
+};
+
+done_testing;