From bb08e3c1a1e3352862f9c795b60a33a9c81ec64a Mon Sep 17 00:00:00 2001
From: David Ferrone <zapwai@gmail.com>
Date: Mon, 5 Jun 2023 17:52:51 -0400
Subject: Week 220

---
 challenge-220/zapwai/perl/ch-1.pl | 13 +++++++++++++
 challenge-220/zapwai/perl/ch-2.pl | 33 +++++++++++++++++++++++++++++++++
 2 files changed, 46 insertions(+)
 create mode 100644 challenge-220/zapwai/perl/ch-1.pl
 create mode 100644 challenge-220/zapwai/perl/ch-2.pl

diff --git a/challenge-220/zapwai/perl/ch-1.pl b/challenge-220/zapwai/perl/ch-1.pl
new file mode 100644
index 0000000000..737084de80
--- /dev/null
+++ b/challenge-220/zapwai/perl/ch-1.pl
@@ -0,0 +1,13 @@
+use v5.30.0;
+no warnings;
+my @words = ("Perl", "Rust", "Raku");
+say "Input: \@words = (" . join(",",@words) . ")";
+$words[$_] = lc $words[$_] for (0 .. $#words);
+my @intersection = split("",$words[0]);
+for my $i (1 .. $#words) {
+    my @letters = split("",$words[$i]);
+    for my $j (0 .. $#intersection) {
+	splice(@intersection, $j, 1) unless ($intersection[$j] ~~ @letters);
+    }
+}
+say "Output: @intersection";
diff --git a/challenge-220/zapwai/perl/ch-2.pl b/challenge-220/zapwai/perl/ch-2.pl
new file mode 100644
index 0000000000..eb1e023045
--- /dev/null
+++ b/challenge-220/zapwai/perl/ch-2.pl
@@ -0,0 +1,33 @@
+use v5.30.0;
+use Algorithm::Permute;
+my @ints = (1, 17, 8);
+#my @ints = (2,2,2);
+say "Input: \@ints = (" . join(",",@ints) . ")";
+my $p = Algorithm::Permute->new(\@ints);
+print "Output: ";
+my $out;
+while (my @perm = $p->next) {
+    my $current_print = "(" . join(",",@perm) . ")";
+    next if ($out =~ m/$current_print/);
+    $out .= $current_print if is_squareful(@perm);
+}
+$out =~ s/\)\(/\), \(/;
+say $out;
+
+sub is_squareful {
+    my @list = @_;
+    my $cnt;
+    foreach (0 .. $#list-1) {
+	my $sum = $list[$_] + $list[$_+1];
+	$cnt++ if (is_square($sum));
+    }
+    return 1 if ($cnt == $#list);
+    0
+}
+
+sub is_square {
+    my $num = shift;
+    my $U = int (sqrt($num));
+    return 1 if ($U**2 == $num);
+    0
+}
-- 
cgit