Week 201

2 files changed, 54 insertions, 0 deletions

diff --git a/challenge-201/cheok-yin-fung/perl/ch-1.pl b/challenge-201/cheok-yin-fung/perl/ch-1.pl
new file mode 100644
index 0000000000..f6034aaa70
--- /dev/null
+++ b/challenge-201/cheok-yin-fung/perl/ch-1.pl
@@ -0,0 +1,20 @@
+# The Weekly Challenge 201
+# Task 1 Missing Numbers
+
+sub mn {
+    my @arr = @_;
+    my $tail = scalar @arr;
+    my %check;
+    $check{$_} = 1 for @arr;
+    my @ans;
+    for (0..$tail) {
+        push @ans, $_ if !$check{$_};
+    }
+    return [@ans];
+}
+
+
+use Test::More tests=>2;
+use Test::Deep;
+cmp_deeply(mn(0,1,3), [2]);
+cmp_deeply(mn(0,1), [2]);
diff --git a/challenge-201/cheok-yin-fung/perl/ch-2.pl b/challenge-201/cheok-yin-fung/perl/ch-2.pl
new file mode 100644
index 0000000000..0e01f45f52
--- /dev/null
+++ b/challenge-201/cheok-yin-fung/perl/ch-2.pl
@@ -0,0 +1,34 @@
+# The Weekly Challenge 201
+# Task 2 Penny Piles
+
+use v5.30.0;
+use warnings;
+
+# algorithm devised by J. Kelleher
+
+my $n = $ARGV[0] || 5;
+
+my $num_of_ways = 0;
+my @a = (0) x ($n+2);
+$a[1] = $n;
+my $cnt = 1;
+while ($cnt != 0) {
+    my $xdum = $a[$cnt-1]+1;
+    my $ydum = $a[$cnt]-1;
+    $cnt--;
+    while ($xdum <= $ydum) {
+        $a[$cnt] = $xdum;
+        $ydum -= $xdum;
+        $cnt++;
+    }
+    $a[$cnt] = $xdum+$ydum;
+    # Print Result
+    for my $i (0..$cnt) {
+        print $a[$i], " ";
+    }
+    $num_of_ways++;
+    say "";
+}
+
+# Print Final Result
+say "Number of Ways: ", $num_of_ways;