258 DAJ

2 files changed, 70 insertions, 0 deletions

diff --git a/challenge-258/dave-jacoby/perl/ch-1.pl b/challenge-258/dave-jacoby/perl/ch-1.pl
new file mode 100644
index 0000000000..e9152964ba
--- /dev/null
+++ b/challenge-258/dave-jacoby/perl/ch-1.pl
@@ -0,0 +1,23 @@
+#!/usr/bin/env perl
+
+use strict;
+use warnings;
+use experimental qw{ say postderef signatures state };
+
+my @examples = (
+
+    [ 10,  1, 111, 24, 1000 ],
+    [ 111, 1, 11111 ],
+    [ 2,   8, 1024, 256 ],
+);
+
+for my $example (@examples) {
+    my $output = scalar grep { ( length $_ ) % 2 == 0 } $example->@*;
+    my $ints   = join ', ', $example->@*;
+
+    say <<~"END";
+    Input:  \@ints = ($ints)
+    Output: $output
+    END
+}
+
diff --git a/challenge-258/dave-jacoby/perl/ch-2.pl b/challenge-258/dave-jacoby/perl/ch-2.pl
new file mode 100644
index 0000000000..501e50a669
--- /dev/null
+++ b/challenge-258/dave-jacoby/perl/ch-2.pl
@@ -0,0 +1,47 @@
+#!/usr/bin/env perl
+
+use strict;
+use warnings;
+use experimental qw{ say postderef signatures state };
+
+use List::Util qw{ sum0 };
+
+my @examples = (
+
+    {
+        ints => [ 2, 5, 9, 11, 3 ],
+        k    => 1
+    },
+    {
+        ints => [ 2, 5, 9, 11, 3 ],
+        k    => 2
+    },
+    {
+        ints => [ 2, 5, 9, 11, 3 ],
+        k    => 0
+    }
+);
+
+for my $example (@examples) {
+    my @output = sum_of_values($example);
+    my $ints   = join ', ', $example->{ints}->@*;
+    my $k      = join ', ', $example->{k};
+    my $output = join ', ', @output;
+
+    say <<~"END";
+    Input:  \@ints = ($ints), \$k = $k
+    Output: $output
+    END
+}
+
+sub sum_of_values ($obj) {
+    my @ints   = $obj->{ints}->@*;
+    my $k      = $obj->{k};
+    my $output = 0;
+
+    for my $i ( 0 .. $#ints ) {
+        my $s = sum0 split //, sprintf '%b', $i;
+        $output += $ints[$i] if $s == $k;
+    }
+    return $output;
+}