Week 204 Task 1

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diff --git a/challenge-204/cheok-yin-fung/perl/ch-1.pl b/challenge-204/cheok-yin-fung/perl/ch-1.pl
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+# The Weekly Challenge 204
+# Task 1 Monotonic Array
+use v5.30.0;
+use warnings;
+use List::Util qw/all/;
+use List::MoreUtils qw/slide/;
+
+sub ma {
+    my @arr = @_;
+    return    (all {$_ >= 0} slide {$a-$b} @arr)
+           || (all {$_ <= 0} slide {$a-$b} @arr);
+}
+
+use Test::More tests=>3;
+ok ma(1,2,2,3) == 1;
+ok ma(1,3,2) == 0;
+ok ma(6,5,5,4) == 1;