Merge pull request #12011 from choroba/ech321

Solve 321: Distinct Average & Backspace Compare by E. Choroba

2 files changed, 35 insertions, 0 deletions

diff --git a/challenge-321/e-choroba/perl/ch-1.pl b/challenge-321/e-choroba/perl/ch-1.pl
new file mode 100755
index 0000000000..6cbf0aa7da
--- /dev/null
+++ b/challenge-321/e-choroba/perl/ch-1.pl
@@ -0,0 +1,17 @@
+#!/usr/bin/perl
+use warnings;
+use strict;
+use experimental qw( signatures );
+
+sub distinct_average(@nums) {
+    @nums = sort { $a <=> $b } @nums;
+    my %avg;
+    undef $avg{ ($nums[$_] + $nums[ $#nums - $_ ]) / 2 } for 0 .. @nums / 2;
+    return scalar keys %avg
+}
+
+use Test::More tests => 3;
+
+is distinct_average(1, 2, 4, 3, 5, 6), 1, 'Example 1';
+is distinct_average(0, 2, 4, 8, 3, 5), 2, 'Example 2';
+is distinct_average(7, 3, 1, 0, 5, 9), 2, 'Example 3';
diff --git a/challenge-321/e-choroba/perl/ch-2.pl b/challenge-321/e-choroba/perl/ch-2.pl
new file mode 100755
index 0000000000..a1603b42c7
--- /dev/null
+++ b/challenge-321/e-choroba/perl/ch-2.pl
@@ -0,0 +1,18 @@
+#!/usr/bin/perl
+use warnings;
+use strict;
+use experimental qw( signatures );
+
+sub backspace_compare($str1, $str2) {
+    for ($str1, $str2) {
+        1 while s/[^#]#//;
+    }
+    return $str1 eq $str2
+}
+
+use Test2::V0;
+plan(3);
+
+is backspace_compare('ab#c', 'ad#c'), bool(1), 'Example 1';
+is backspace_compare('ab##', 'a#b#'), bool(1), 'Example 2';
+is backspace_compare('a#b', 'c'), bool(0), 'Example 3';