@Renich: you passed, good!

Please see the FAQ I linked, there you can find some hints on printing, flushing (can be important), and other things related to debugging your solution.

That's the problem. With the timeout, I odn't get any debugging information. I'll add some prints to see if that shows. Thanks!

If I were to guess, I'd say you are testing only small inputs. Do you know how many tests you pass before timeout? Add some printing to your solution (see here how) and check how far you get.

I've managed to reduce the execution of the local tests to ~0.2 ms and, still, I timeout on the "attempt" tests. :S