4 files changed, 302 insertions, 0 deletions
diff --git a/challenge-088/juliodcs/perl/NUL b/challenge-088/juliodcs/perl/NUL
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/challenge-088/juliodcs/perl/NUL
diff --git a/challenge-088/juliodcs/perl/ch-1.pl b/challenge-088/juliodcs/perl/ch-1.pl
new file mode 100644
index 0000000000..17646c24d4
--- /dev/null
+++ b/challenge-088/juliodcs/perl/ch-1.pl
@@ -0,0 +1,29 @@
+use strict;
+use warnings;
+use feature 'say';
+use experimental 'signatures';
+use List::Util 'reduce';
+
+sub array_of_product(@n) {
+    [ map {
+        @{$_} == 0 ? 0 : reduce { $a * $b } @{$_}
+    } 
+    map { 
+        my $idx = $_;
+        [ map { $n[$_] } grep { $idx != $_ } 0 .. @n - 1 ]
+    } 0 .. @n - 1 ]
+}
+
+if (@ARGV > 0) {
+    say join q(, ), array_of_product(@ARGV)->@*;
+    exit 0;
+}
+
+use Test::More;
+
+is_deeply array_of_product(999), [0], 'One element returns 0';
+is_deeply array_of_product(999, 888), [888, 999], 'Two elements invert positions';
+is_deeply array_of_product(5, 2, 1, 4, 3), [24, 60, 120, 30, 40], 'Example 1';
+is_deeply array_of_product(2, 1, 4, 3), [12, 24, 6, 8], 'Example 2';
+
+done_testing;
diff --git a/challenge-088/juliodcs/perl/ch-2.pl b/challenge-088/juliodcs/perl/ch-2.pl
new file mode 100644
index 0000000000..32ca3083da
--- /dev/null
+++ b/challenge-088/juliodcs/perl/ch-2.pl
@@ -0,0 +1,105 @@
+use strict;
+use warnings;
+use feature 'say';
+use experimental 'signatures';
+use Data::Dumper;
+
+sub spiral_matrix($matrix, $acc = []) {
+    return $acc if $matrix->@* == 0;
+    my @new_acc = ($acc->@*, (shift $matrix->@*)->@*);
+
+    spiral_matrix(rotator($matrix), \@new_acc);
+}
+
+sub rotator($matrix) {
+    return [] if $matrix->@* == 0;
+    my $w = $matrix->[0]->@*;
+
+    [map {my $i = $_;[ map {$_->[$i]} $matrix->@* ]} reverse 0 .. $w - 1]
+}
+
+if (@ARGV > 0) {
+    say join q(, ), Dumper spiral_matrix(\@ARGV);
+    exit 0;
+}
+
+use Test::More;
+
+is_deeply spiral_matrix([
+[ 1 ],
+]),
+[ 1 ],
+'One number';
+
+is_deeply spiral_matrix([
+[ 1, 2, 3 ],
+]),
+[ 1, 2, 3 ],
+'One row';
+
+is_deeply spiral_matrix([
+[ 1 ],
+[ 2 ],
+[ 3 ],
+]),
+[ 1, 2, 3 ],
+'One column';
+
+is_deeply spiral_matrix([
+[ 1, 2, 3 ],
+[ 1, 2, 3 ],
+]),
+[ 1, 2, 3, 3, 2, 1 ],
+'Two rows';
+
+is_deeply spiral_matrix([
+[ 1, 7 ],
+[ 2, 8 ],
+[ 3, 9 ],
+]),
+[ 1, 7, 8, 9, 3, 2 ],
+'Two columns';
+
+is_deeply spiral_matrix([
+[ 1, 2, 3 ],
+[ 1, 2, 3 ],
+[ 1, 2, 3 ],
+]),
+[ 1, 2, 3, 3, 3, 2, 1, 1, 2 ],
+'Three rows';
+
+is_deeply spiral_matrix([
+[ 1, 7, 4 ],
+[ 2, 8, 5 ],
+[ 3, 9, 6 ],
+]),
+[ 1, 7, 4, 5, 6, 9, 3, 2, 8 ],
+'Three columns';
+
+is_deeply spiral_matrix([
+[ 1, 2, 3, 0 ],
+[ 4, 5, 6, 0 ],
+[ 4, 9, 1, 0 ],
+[ 7, 8, 9, 1 ],
+]),
+[ 1, 2, 3, 0, 0, 0, 1, 9, 8, 7, 4, 4, 5, 6, 1, 9 ],
+'4x4 matrix';
+
+is_deeply spiral_matrix([
+[ 1, 2, 3 ],
+[ 4, 5, 6 ],
+[ 7, 8, 9 ],
+]),
+[ 1, 2, 3, 6, 9, 8, 7, 4, 5 ],
+'Example 1';
+
+is_deeply spiral_matrix([
+[  1,  2,  3,  4 ],
+[  5,  6,  7,  8 ],
+[  9, 10, 11, 12 ],
+[ 13, 14, 15, 16 ],
+]),
+[ 1, 2, 3, 4, 8, 12, 16, 15, 14, 13, 9, 5, 6, 7, 11, 10 ],
+'Example 2';
+
+done_testing;
diff --git a/challenge-088/juliodcs/perl/ch-2.pl.backup.pl b/challenge-088/juliodcs/perl/ch-2.pl.backup.pl
new file mode 100644
index 0000000000..512465f90e
--- /dev/null
+++ b/challenge-088/juliodcs/perl/ch-2.pl.backup.pl
@@ -0,0 +1,168 @@
+use strict;
+use warnings;
+use feature 'say';
+use experimental 'signatures';
+use Data::Dumper;
+
+# flattens matrix and starts the process. Needs width and height
+sub spiral_matrix($matrix) {
+    my $flat = [ map { $_->@* } $matrix->@* ];
+    spiral($flat, int $matrix->@*, int $matrix->[0]->@*)
+}
+
+# accumulates the first 'row' and recursively repeats the
+# process after 180º-rotating the rest of the 'matrix'
+sub spiral($line, $height, $width, $acc = []) {
+    return $height == 1
+        ? [ $acc->@*, $line->@* ]
+        : spiral(
+            rotate([$line->@[$width .. $line->@* - 1]], $width),
+            $width,
+            $height - 1,
+            [ $acc->@*, $line->@[0 .. $width - 1] ] )
+}
+
+# rotates the 'matrix'
+sub rotate($line, $width, $index = $width - 1, $acc = []) {
+    my $new_acc = [ $acc->@*, $line->[$index] ];
+    return $index == $line->@* - $width
+        ? $new_acc
+        : rotate($line, $width, next_index($line, $index, $width), $new_acc)
+}
+
+# next index to process in the 'matrix'
+sub next_index($line, $index, $width) {
+    my $next = $index + $width;
+    return $next > $line->@* ? ($next - 1) % $width : $next
+}
+
+
+sub spiral_matrix_backup($matrix, $acc = []) {    
+    return $acc if $matrix->@* == 0;
+    
+    my $h = $matrix->@*;
+    my $w = $matrix->[0]->@*;
+    
+    return [ map { $_->@* } $matrix->@* ] if $h > 1 && $w == 1;
+    
+    my $top_w = $w == 1 ? 1 : 2;
+    my $top_h = $h == 1 ? 1 : 2;
+
+    my @top    = $matrix->[0]->@[0 .. $w-$top_w];
+    my @right  = ( map { $_->[$w - 1] } $matrix->@* )[0 .. $h-$top_h];
+    my @bottom = ( reverse @{$matrix->[$h - 1]} )[0 .. $w-$top_w];
+    my @left   = ( reverse map { $_->[0] } $matrix->@* )[0 .. $h-$top_h];
+    my @core   = map { [ $_->@[1 .. $w-$top_w] ] } $matrix->@[1 .. $h-$top_h];
+    
+    push @{$acc}, @top;
+    push @{$acc}, @right if $w > 1;
+    push @{$acc}, @bottom if $h > 1;
+    push @{$acc}, @left if $h > 1;
+    
+    return spiral_matrix(\@core, $acc);
+}
+
+if (@ARGV > 0) {
+    say join q(, ), Dumper spiral_matrix(\@ARGV);
+    exit 0;
+}
+
+sub rotator($matrix) {
+    my $h = $matrix->@*;
+    my $w = $matrix->[0]->@*;
+    
+    my @res = map { my $index = $_; [ map { $_->[$index] } $matrix->@* ] } reverse 0 .. $w - 1;
+    
+    say Dumper \@res;
+}
+
+say Dumper rotator([
+[1, 2, 3],
+[1, 2, 3],
+[1, 2, 3],
+]);
+
+
+exit 0;
+
+use Test::More;
+
+is_deeply spiral_matrix([
+[ 1 ],
+]),
+[ 1 ],
+'One number';
+
+is_deeply spiral_matrix([
+[ 1, 2, 3 ],
+]),
+[ 1, 2, 3 ],
+'One row';
+
+
+is_deeply spiral_matrix([
+[ 1 ],
+[ 2 ],
+[ 3 ],
+]),
+[ 1, 2, 3 ],
+'One column';
+
+is_deeply spiral_matrix([
+[ 1, 2, 3 ],
+[ 1, 2, 3 ],
+]),
+[ 1, 2, 3, 3, 2, 1 ],
+'Two rows';
+
+is_deeply spiral_matrix([
+[ 1, 7 ],
+[ 2, 8 ],
+[ 3, 9 ],
+]),
+[ 1, 7, 8, 9, 3, 2 ],
+'Two columns';
+
+is_deeply spiral_matrix([
+[ 1, 2, 3 ],
+[ 1, 2, 3 ],
+[ 1, 2, 3 ],
+]),
+[ 1, 2, 3, 3, 3, 2, 1, 1, 2 ],
+'Three rows';
+
+is_deeply spiral_matrix([
+[ 1, 7, 4 ],
+[ 2, 8, 5 ],
+[ 3, 9, 6 ],
+]),
+[ 1, 7, 4, 5, 6, 9, 3, 2, 8 ],
+'Three columns';
+
+is_deeply spiral_matrix([
+[ 1, 2, 3, 0 ],
+[ 4, 5, 6, 0 ],
+[ 4, 9, 1, 0 ],
+[ 7, 8, 9, 1 ],
+]),
+[ 1, 2, 3, 0, 0, 0, 1, 9, 8, 7, 4, 4, 5, 6, 1, 9 ],
+'4x4 matrix';
+
+is_deeply spiral_matrix([
+[ 1, 2, 3 ],
+[ 4, 5, 6 ],
+[ 7, 8, 9 ],
+]),
+[ 1, 2, 3, 6, 9, 8, 7, 4, 5 ],
+'Example 1';
+
+is_deeply spiral_matrix([
+[  1,  2,  3,  4 ],
+[  5,  6,  7,  8 ],
+[  9, 10, 11, 12 ],
+[ 13, 14, 15, 16 ],
+]),
+[ 1, 2, 3, 4, 8, 12, 16, 15, 14, 13, 9, 5, 6, 7, 11, 10 ],
+'Example 2';
+
+done_testing;