Sorry, I found my solution wrong - there exists an array returned when N = 25, not null!

Of course I won't fail in both cases - could you please check through the test in python version? If you check it then you will know what I meant...

I have similar question as well - from the sample test, returning False would lead to error of "object is not subscriptable", but returning emply array then it is not expected in assertion of test, returning "[] should equal False"

I'd like to search for someone but could not find this feature? Anyone can help?