2 files changed, 57 insertions, 0 deletions
diff --git a/challenge-320/dave-jacoby/perl/ch-1.pl b/challenge-320/dave-jacoby/perl/ch-1.pl
new file mode 100644
index 0000000000..052d35c437
--- /dev/null
+++ b/challenge-320/dave-jacoby/perl/ch-1.pl
@@ -0,0 +1,27 @@
+#!/usr/bin/env perl
+
+use strict;
+use warnings;
+use experimental qw{ say state postderef signatures };
+
+my @examples = (
+
+    [ -3, -2, -1, 1, 2, 3 ],
+    [ -2, -1, 0,  0, 1 ],
+    [ 1,  2,  3,  4 ],
+);
+
+for my $example (@examples) {
+    my $str    = join ', ', $example->@*;
+    my $output = max_count( $example->@* );
+    say <<"END";
+    Input:  \$str = ($str)
+    Output: $output
+END
+}
+
+sub max_count(@ints) {
+    my $pos = scalar grep { $_ > 0 } @ints;
+    my $neg = scalar grep { $_ < 0 } @ints;
+    return $pos > $neg ? $pos : $neg;
+}
diff --git a/challenge-320/dave-jacoby/perl/ch-2.pl b/challenge-320/dave-jacoby/perl/ch-2.pl
new file mode 100644
index 0000000000..f5816533d5
--- /dev/null
+++ b/challenge-320/dave-jacoby/perl/ch-2.pl
@@ -0,0 +1,30 @@
+#!/usr/bin/env perl
+
+use strict;
+use warnings;
+use experimental qw{ say state postderef signatures };
+
+use List::Util qw{ sum0 };
+
+my @examples = (
+
+    [ 1, 23, 4, 5 ],
+    [ 1, 2,  3, 4, 5 ],
+    [ 1, 2,  34 ],
+);
+
+for my $example (@examples) {
+    my $str    = join ', ', $example->@*;
+    my $output = sum_diff( $example->@* );
+    say <<"END";
+    Input:  \$str = ($str)
+    Output: $output
+END
+}
+
+sub sum_diff (@ints) {
+    my $digit_sum   = sum0 @ints;
+    my $element_sum = sum0 map { split //, $_ } @ints;
+    return abs $digit_sum - $element_sum;
+}
+