From 19b93408e95cd514003de1a1841aa0f73fd0ddb7 Mon Sep 17 00:00:00 2001
From: James Smith <js5@sanger.ac.uk>
Date: Sun, 15 Jan 2023 09:46:13 +0000
Subject: Create ch-1.pl

---
 challenge-199/james-smith/perl/ch-1.pl | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)
 create mode 100644 challenge-199/james-smith/perl/ch-1.pl

diff --git a/challenge-199/james-smith/perl/ch-1.pl b/challenge-199/james-smith/perl/ch-1.pl
new file mode 100644
index 0000000000..2dbeb6a090
--- /dev/null
+++ b/challenge-199/james-smith/perl/ch-1.pl
@@ -0,0 +1,23 @@
+#!/usr/local/bin/perl
+
+use strict;
+use warnings;
+use feature qw(say);
+use Test::More;
+use Benchmark qw(cmpthese timethis);
+
+my @TESTS = (
+  [ [1,2,3,1,1,3],4 ],
+  [ [1,2,3],      0 ],
+  [ [1,1,1,1],    6 ],
+);
+
+is( good_pairs(@{$_->[0]}), $_->[1] ) foreach @TESTS;
+
+sub good_pairs {
+  my($c,%f);
+  $f{$_}++ for @_;
+  $c+=$_*($_-1) for values %f;
+  $c/2;
+}
+done_testing();
-- 
cgit