2 files changed, 47 insertions, 0 deletions
diff --git a/challenge-199/cheok-yin-fung/perl/ch-1.pl b/challenge-199/cheok-yin-fung/perl/ch-1.pl
new file mode 100644
index 0000000000..f403725e3c
--- /dev/null
+++ b/challenge-199/cheok-yin-fung/perl/ch-1.pl
@@ -0,0 +1,20 @@
+# The Weekly Challenge 199
+# Task 1 Good Pairs
+use v5.30.0;
+use warnings;
+
+sub good_pairs {
+    my @a = $_[0]->@*;
+    my $ans = 0;
+    for my $i (0..$#a) {
+        for my $j ($i+1..$#a) {
+            $ans++ if $a[$i] == $a[$j];
+        }
+    }
+    return $ans;
+}
+
+use Test::More tests=>3;
+ok good_pairs([1,2,3,1,1,3]) == 4;
+ok good_pairs([1,2,3]) == 0;
+ok good_pairs([1,1,1,1]) == 6;
diff --git a/challenge-199/cheok-yin-fung/perl/ch-2.pl b/challenge-199/cheok-yin-fung/perl/ch-2.pl
new file mode 100644
index 0000000000..c6986adaa2
--- /dev/null
+++ b/challenge-199/cheok-yin-fung/perl/ch-2.pl
@@ -0,0 +1,27 @@
+# The Weekly Challenge 199
+# Task 2 Good Triplets
+use v5.30.0;
+use warnings;
+
+sub good_triplets {
+    my @a = $_[0]->@*;
+    my ($x, $y, $z) = ($_[1], $_[2], $_[3]);
+    my $ans = 0;
+    for my $i (0..$#a) {
+        for my $j ($i+1..$#a) {
+            for my $k ($j+1..$#a) {
+                $ans++ if 
+                    (abs($a[$i]-$a[$j]) <= $x)
+                        &&
+                    (abs($a[$j]-$a[$k]) <= $y)
+                        &&
+                    (abs($a[$k]-$a[$i]) <= $z);
+            }
+        }
+    }
+    return $ans;
+}
+
+use Test::More tests=>2;
+ok good_triplets([3,0,1,1,9,7], 7, 2, 3) == 4;
+ok good_triplets([1,1,2,2,3], 0, 0, 1) == 0;