DAJ 266

2 files changed, 92 insertions, 0 deletions

diff --git a/challenge-266/dave-jacoby/perl/ch-1.pl b/challenge-266/dave-jacoby/perl/ch-1.pl
new file mode 100644
index 0000000000..6f07fec7fa
--- /dev/null
+++ b/challenge-266/dave-jacoby/perl/ch-1.pl
@@ -0,0 +1,32 @@
+#!/usr/bin/env perl
+
+use strict;
+use warnings;
+use experimental qw{ fc postderef say signatures state };
+
+my @examples = (
+
+    [ 'Mango is sweet',      'Mango is sour' ],
+    [ 'Mango Mango',         'Orange' ],
+    [ 'Mango is Mango',      'Orange is Orange' ],
+    [ 'Mango is not Orange', 'Orange isn\'t Mango' ],
+);
+
+for my $example (@examples) {
+    my @output = uncommon_words(@$example);
+    my $output = join ', ', map { qq{'$_'} }
+        map { my $z = $_; $z =~ s/\'/\\\'/gmix; $z } @output;
+    say <<"END";
+    Input:  \$line1 = '$example->[0]'
+            \$line2 = '$example->[1]'
+    Output: ($output)
+END
+}
+
+sub uncommon_words (@strings) {
+    my %hash;
+    my @output = map { $hash{$_}++; $_ } map { split /\s+/mix, $_ } @strings;
+    @output = grep { $hash{$_} == 1 } @output;
+    return '' unless scalar @output;
+    return return @output;
+}
diff --git a/challenge-266/dave-jacoby/perl/ch-2.pl b/challenge-266/dave-jacoby/perl/ch-2.pl
new file mode 100644
index 0000000000..226268feef
--- /dev/null
+++ b/challenge-266/dave-jacoby/perl/ch-2.pl
@@ -0,0 +1,60 @@
+#!/usr/bin/env perl
+
+use strict;
+use warnings;
+use experimental qw{ fc say postderef signatures state };
+
+my @examples = (
+
+    [ [ 1, 0, 0, 2 ], [ 0, 3, 4, 0 ], [ 0, 5, 6, 0 ], [ 7, 0, 0, 1 ], ],
+    [ [ 1, 2, 3 ], [ 4, 5, 6 ], [ 7, 8, 9 ], ],
+    [ [ 1, 0, 2 ], [ 0, 3, 0 ], [ 4, 0, 5 ], ],
+    [ [ 1, 0, 2 ], [ 0, 3, 0 ], [ 4, 3, 5 ], ],
+);
+
+for my $matrix (@examples) {
+    my $output = x_matrix($matrix) ? 'true' : 'false';
+    my $input  = display_matrix($matrix);
+
+    say <<"END";
+    Input: \$matrix = [
+          $input, 
+        ]
+    Output: $output
+END
+}
+
+sub display_matrix ($matrix) {
+    return join ",\n          ",
+        map { join ' ', '[', ( join ', ', $_->@* ), ']' } $matrix->@*;
+}
+
+# A square matrix is an X Matrix
+# if all the elements on the main diagonal
+#     and antidiagonal are non-zero
+# and everything else are zero.
+sub x_matrix ($matrix) {
+    my $z = -1 + scalar $matrix->@*;
+    my %diag;
+
+    for my $i ( 0 .. $z ) {
+        my $j = $z - $i;
+        $diag{$i}{$i} = 1;
+        $diag{$i}{$j} = 1;
+    }
+
+    for my $i ( 0 .. $z ) {
+        for my $j ( 0 .. $z ) {
+            my $k = $matrix->[$i][$j];
+            my $d = $diag{$i}{$j} || 0;
+            if ($d) {
+                return 0 if $k == 0;
+            }
+            else {
+                return 0 if $k != 0;
+            }
+        }
+    }
+    return 7;
+}
+