DAJ 261

3 files changed, 66 insertions, 0 deletions

diff --git a/challenge-261/dave-jacoby/blog.txt b/challenge-261/dave-jacoby/blog.txt
new file mode 100644
index 0000000000..22c32d2a3a
--- /dev/null
+++ b/challenge-261/dave-jacoby/blog.txt
@@ -0,0 +1 @@
+https://jacoby-lpwk.onrender.com/2024/03/18/can-you-digit-it-weekly-challenge-261.html
diff --git a/challenge-261/dave-jacoby/perl/ch-1.pl b/challenge-261/dave-jacoby/perl/ch-1.pl
new file mode 100644
index 0000000000..77fb850a02
--- /dev/null
+++ b/challenge-261/dave-jacoby/perl/ch-1.pl
@@ -0,0 +1,32 @@
+#!/usr/bin/env perl
+
+use strict;
+use warnings;
+use experimental qw{ say postderef signatures state };
+
+use List::Util qw{ sum0 };
+
+my @examples = (
+
+    [ 1,   2,   3, 45 ],
+    [ 1,   12,  3 ],
+    [ 1,   2,   3,   4 ],
+    [ 236, 416, 336, 350 ],
+);
+
+for my $example (@examples) {
+    my @ints   = $example->@*;
+    my $ints   = join ',', @ints;
+    my $output = element_digit_sum(@ints);
+    say <<"END";
+    Input:  \@ints = ($ints)
+    Output: $output
+END
+}
+
+sub element_digit_sum (@ints) {
+    my @digits      = map { split //, $_ } @ints;
+    my $element_sum = sum0 @ints;
+    my $digit_sum   = sum0 @digits;
+    return abs $element_sum - $digit_sum;
+}
diff --git a/challenge-261/dave-jacoby/perl/ch-2.pl b/challenge-261/dave-jacoby/perl/ch-2.pl
new file mode 100644
index 0000000000..82b437a08c
--- /dev/null
+++ b/challenge-261/dave-jacoby/perl/ch-2.pl
@@ -0,0 +1,33 @@
+#!/usr/bin/env perl
+
+use strict;
+use warnings;
+use experimental qw{ say postderef signatures state };
+
+use List::Util qw{ any };
+
+my @examples = (
+
+    { ints => [ 5, 3, 6, 1, 12 ], start => 3 },
+    { ints => [ 1, 2, 4, 3 ],     start => 1 },
+    { ints => [ 5, 6, 7 ],        start => 2 },
+);
+
+for my $example (@examples) {
+    my $start  = $example->{start};
+    my @ints   = $example->{ints}->@*;
+    my $output = multiply_by_two( $start, @ints );
+    my $ints   = join ',', @ints;
+
+    say <<"END";
+    Input: \@word = ($ints) and \$start = $start
+    Output: $output
+END
+}
+
+sub multiply_by_two ( $start, @ints ) {
+    while ( any { $start == $_ } @ints ) {
+        $start *= 2;
+    }
+    return $start;
+}