From 7ffa0cb081359befabf2d8f38123fd39d46fd10e Mon Sep 17 00:00:00 2001
From: Andreas Mahnke <andreas.mahnke@leuphana.de>
Date: Mon, 12 May 2025 16:17:02 +0200
Subject: Challenge 321

---
 challenge-321/mahnkong/perl/ch-1.pl | 19 +++++++++++++++++++
 challenge-321/mahnkong/perl/ch-2.pl | 24 ++++++++++++++++++++++++
 2 files changed, 43 insertions(+)
 create mode 100644 challenge-321/mahnkong/perl/ch-1.pl
 create mode 100644 challenge-321/mahnkong/perl/ch-2.pl

diff --git a/challenge-321/mahnkong/perl/ch-1.pl b/challenge-321/mahnkong/perl/ch-1.pl
new file mode 100644
index 0000000000..7c4ccf577e
--- /dev/null
+++ b/challenge-321/mahnkong/perl/ch-1.pl
@@ -0,0 +1,19 @@
+use strict;
+use warnings;
+use feature 'signatures';
+use Test::More 'no_plan';
+
+sub run(@nums) {
+    return undef if scalar(@nums) % 2 != 0;
+
+    @nums = sort { $a <=> $b } @nums;
+    my %avgs;
+    while (scalar(@nums)) {
+        $avgs{(shift(@nums) + pop(@nums))/2} = undef;
+    }
+    return scalar(keys(%avgs));
+}
+
+is(run(1, 2, 4, 3, 5, 6), 1, "Example 1");
+is(run(0, 2, 4, 8, 3, 5), 2, "Example 2");
+is(run(7, 3, 1, 0, 5, 9), 2, "Example 3");
diff --git a/challenge-321/mahnkong/perl/ch-2.pl b/challenge-321/mahnkong/perl/ch-2.pl
new file mode 100644
index 0000000000..0f0aa596c6
--- /dev/null
+++ b/challenge-321/mahnkong/perl/ch-2.pl
@@ -0,0 +1,24 @@
+use strict;
+use warnings;
+use feature 'signatures';
+use Test::More 'no_plan';
+
+sub analyze($str) {
+    my @buffer;
+    foreach my $c (split //, $str) {
+        if ($c eq '#') {
+            pop @buffer if scalar(@buffer) > 0;
+        } else {
+            push @buffer, $c;
+        }
+    }
+    return join('', @buffer);
+}
+
+sub run($str1, $str2) {
+    return analyze($str1) eq analyze($str2) ? 1 : 0;
+}
+
+is(run("ab#c", "ad#c"), 1, "Example 1");
+is(run("ab##", "a#b#"), 1, "Example 1");
+is(run("a#b", "c"), 0, "Example 1");
-- 
cgit