w249 - Task 1

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+#!/bin/perl
+
+=pod
+
+The Weekly Challenge - 249
+- https://theweeklychallenge.org/blog/perl-weekly-challenge-249
+
+Author: Niels 'PerlBoy' van Dijke
+
+Task 1: Equal Pairs
+Submitted by: Mohammad S Anwar
+
+You are given an array of integers with even number of elements.
+
+Write a script to divide the given array into equal pairs such that:
+
+a) Each element belongs to exactly one pair.
+b) The elements present in a pair are equal.
+
+=cut
+
+use v5.32;
+use common::sense;
+use feature qw(signatures);
+
+use Test2::V0;
+
+use List::MoreUtils qw(frequency);
+
+sub equalPairs (@ints) {
+  my %f = frequency @ints;
+  return [] if grep { $f{$_} % 2 } keys %f;
+  [map { [$_,$_] } map { ($_) x ($f{$_}>>1) } sort {$a <=> $b} keys %f];
+}
+
+is(equalPairs(3,2,3,2,2,2),[[2,2],[2,2],[3,3]]);
+is(equalPairs(1,2,3,4,),[]);
+
+done_testing;