add perl solution for wk-080 ch-1

1 files changed, 18 insertions, 0 deletions

diff --git a/challenge-080/alexander-pankoff/perl/ch-1.pl b/challenge-080/alexander-pankoff/perl/ch-1.pl
new file mode 100644
index 0000000000..d6ef9089ee
--- /dev/null
+++ b/challenge-080/alexander-pankoff/perl/ch-1.pl
@@ -0,0 +1,18 @@
+#!/usr/bin/env perl
+use v5.20;
+use utf8;
+use strict;
+use warnings;
+use autodie;
+use feature qw(say signatures);
+no warnings 'experimental::signatures';
+
+use List::Util qw(first);
+
+say smallest_positive_number_missing(@ARGV);
+
+sub smallest_positive_number_missing( @xs) {
+    my %lookup = map { $_ => 1 } @xs;
+    return first { !$lookup{$_} } 1 .. ( @xs + 1 );
+}
+