1 files changed, 29 insertions, 0 deletions
diff --git a/challenge-030/dave-cross/perl5/ch-2.pl b/challenge-030/dave-cross/perl5/ch-2.pl
new file mode 100644
index 0000000000..bc1e250f83
--- /dev/null
+++ b/challenge-030/dave-cross/perl5/ch-2.pl
@@ -0,0 +1,29 @@
+#!/usr/bin/perl
+
+use strict;
+use warnings;
+use feature qw[say state];
+
+use List::Util 'sum';
+
+# If three numbers add to 12 then the
+# highest number you can have is 10.
+my $max = 10;
+
+for my $x (1 .. $max) {
+  for my $y (1 .. $max) {
+    for my $z (1 .. $max) {
+      say join ', ', $x, $y, $z if valid($x, $y, $z);
+    }
+  }
+}
+
+sub valid {
+  state $seen;
+
+  return if $seen->{join ',', sort { $a <=> $b} @_};
+  return unless sum(@_) == 12;
+  return unless grep { ! ($_ % 2) } @_;
+  $seen->{join ',', sort { $a <=> $b} @_} = 1;
+  return 1;
+}