Week 198 Task 1

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diff --git a/challenge-198/cheok-yin-fung/perl/ch-1.pl b/challenge-198/cheok-yin-fung/perl/ch-1.pl
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+# The Weekly Challenge 198
+# Task 1 Max Gap
+
+use v5.30.0;
+use warnings;
+use List::Util qw/max/;
+use List::MoreUtils qw/slide/;
+
+sub mg {
+    my @list = @_;
+    return 0 if scalar @list == 1;
+    my @slided = slide {$b-$a} @list;
+    my $max = max @slided;
+    return scalar grep {$max == $_} @slided;
+}
+
+use Test::More tests=>2;
+ok mg(1,2,5,8) == 2;
+ok mg(3) == 0;