tasks a-s

Task/Non-continuous-subsequences/Perl/non-continuous-subsequences.pl

@@ -0,0 +1,17 @@
+my ($max, @current);
+sub non_continuous {
+        my ($idx, $has_gap, $found) = @_;
+
+        for ($idx .. $max) {
+                push @current, $_;
+                # print "@current\n" if $has_gap; # uncomment for huge output
+                $found ++ if $has_gap;
+                $found += non_continuous($_ + 1, $has_gap)   if $_ < $max;
+                pop @current;
+                $has_gap = @current;   # don't set gap flag if it's empty still
+        }
+        $found;
+}
+
+$max = 20;      # 1048365 sequences, 10 seconds-ish
+print "found ", non_continuous(1), " sequences\n";