From 6db05034f0c9e0c99c74b0acc3b5fc95ad346c58 Mon Sep 17 00:00:00 2001
From: "E. Choroba" <choroba@matfyz.cz>
Date: Mon, 10 Feb 2025 19:16:01 +0000
Subject: Add solutions to 308: Count Common & Decode XOR by E. Choroba

---
 challenge-308/e-choroba/perl/ch-1.pl | 23 +++++++++++++++++++++++
 challenge-308/e-choroba/perl/ch-2.pl | 20 ++++++++++++++++++++
 2 files changed, 43 insertions(+)
 create mode 100755 challenge-308/e-choroba/perl/ch-1.pl
 create mode 100755 challenge-308/e-choroba/perl/ch-2.pl

diff --git a/challenge-308/e-choroba/perl/ch-1.pl b/challenge-308/e-choroba/perl/ch-1.pl
new file mode 100755
index 0000000000..7898f7ed07
--- /dev/null
+++ b/challenge-308/e-choroba/perl/ch-1.pl
@@ -0,0 +1,23 @@
+#!/usr/bin/perl
+use warnings;
+use strict;
+use experimental qw( signatures );
+
+sub count_common($str1, $str2) {
+    my %common;
+    @common{ @$str1 } = (1) x @$str1;
+    $common{$_} |= 2 for @$str2;
+    return scalar grep $_ == 3, values %common
+}
+
+use Test::More tests => 3;
+
+is count_common(['perl', 'weekly', 'challenge'],
+                ['raku', 'weekly', 'challenge']),
+    2, 'Example 1';
+
+is count_common(['perl', 'raku', 'python'], ['python', 'java']),
+    1, 'Example 2';
+
+is count_common(['guest', 'contribution'], ['fun', 'weekly', 'challenge']),
+    0, 'Example 3';
diff --git a/challenge-308/e-choroba/perl/ch-2.pl b/challenge-308/e-choroba/perl/ch-2.pl
new file mode 100755
index 0000000000..9b09d5c2ba
--- /dev/null
+++ b/challenge-308/e-choroba/perl/ch-2.pl
@@ -0,0 +1,20 @@
+#!/usr/bin/perl
+use warnings;
+use strict;
+use experimental qw( signatures );
+
+sub decode_xor($initial, @encoded) {
+    my @decoded;
+    for my $i ($initial, @encoded) {
+        push @decoded, $i ^ ($decoded[-1] // 0);
+    }
+    return \@decoded
+}
+
+use Test2::V0;
+plan(2 + 1);
+
+is decode_xor(1, 1, 2, 3), [1, 0, 2, 1], 'Example 1';
+is decode_xor(4, 6, 2, 7, 3), [4, 2, 0, 7, 4], 'Example 2';
+
+is decode_xor(1, 1, 2, 5), [1, 0, 2, 7], 'Initial different to last';
-- 
cgit