From 1739fb5fe04eccbc3b3cbf38bfd14460a1b34d10 Mon Sep 17 00:00:00 2001
From: Kjetil Skotheim <kjetil.skotheim@sikt.no>
Date: Mon, 19 Feb 2024 02:28:18 +0100
Subject: https://theweeklychallenge.org/blog/perl-weekly-challenge-256/

---
 challenge-256/kjetillll/perl/ch-1.pl | 28 ++++++++++++++++++++++++++++
 challenge-256/kjetillll/perl/ch-2.pl | 18 ++++++++++++++++++
 2 files changed, 46 insertions(+)
 create mode 100644 challenge-256/kjetillll/perl/ch-1.pl
 create mode 100644 challenge-256/kjetillll/perl/ch-2.pl

diff --git a/challenge-256/kjetillll/perl/ch-1.pl b/challenge-256/kjetillll/perl/ch-1.pl
new file mode 100644
index 0000000000..1b0074490e
--- /dev/null
+++ b/challenge-256/kjetillll/perl/ch-1.pl
@@ -0,0 +1,28 @@
+sub max_pairs {
+    my %maybe;
+    my $pairs = 0;
+    for( @_ ) {
+        my $r = reverse;
+        if( $maybe{ $r } > 0 ) {
+            $maybe{ $r }--;
+            $pairs++;
+        }
+        else {
+            $maybe{ $_ }++;
+        }
+    }
+    $pairs
+}
+
+use Test::More;
+for (
+    ["ab", "de", "ed", "bc"                         => 1],
+    ["aa", "ba", "cd", "ed"                         => 0],
+    ["uv",       "qp", "st", "vu", "mn", "pq"       => 2],
+    ["uv", "uv", "qp", "st", "vu", "mn", "pq"       => 2],
+    ["uv", "uv", "qp", "st", "vu", "mn", "pq", "vu" => 3]
+){
+    my $want = pop @$_;
+    is( max_pairs(@$_), $want );
+}
+done_testing;
diff --git a/challenge-256/kjetillll/perl/ch-2.pl b/challenge-256/kjetillll/perl/ch-2.pl
new file mode 100644
index 0000000000..7ccb052e76
--- /dev/null
+++ b/challenge-256/kjetillll/perl/ch-2.pl
@@ -0,0 +1,18 @@
+sub merge {
+    my($a, $b, $s) = @_;
+    $a =~ s/.//s ? merge($b, $a, $s.$&) : "$s$b"
+}
+
+use Test::More;
+for(
+    [ "abcd", "1234", "a1b2c3d4" ],
+    [ "abc", "12345", "a1b2c345" ],
+    [ "abcde", "123", "a1b2c3de" ],
+    [ "", "xyz", "xyz" ],
+    [ "123", "", "123" ],
+    [ "", "", "" ],
+){
+    my( $str1, $str2, $want ) = @$_;
+    is( merge( $str1, $str2), $want );
+}
+done_testing;
-- 
cgit