day3b

day3/day3b.pm

@@ -0,0 +1,28 @@
+use 5.20.0;
+use experimental 'postderef';
+
+use Array::Tour::Spiral;
+use List::AllUtils qw/ sum /;
+
+my $num = shift;
+
+my $spiral = Array::Tour::Spiral->new( dimensions => $num );
+
+my $grid = [];
+my $first = 1;
+
+while ( my ($x,$y) = $spiral->next->@* ) {
+    if( $first) {
+        $grid->[$x][$y] = 1;
+        $first = 0;
+    }
+    else {
+        $grid->[$x][$y] = sum map { 
+            my $i = $_;
+            map { $grid->[$x+$i][$y+$_] } -1..1
+        } -1..1
+    }
+
+    warn $grid->[$x][$y];
+    exit say $_ for grep { $_ > $num }  $grid->[$x][$y];
+}