With the last suggestion I think the problem is solved, I haven't the error right now.

Hi MircoT,

Still in the same problem using Ruby.

I tried to change some steps in the tests, do you still have the same problem?

Same problem here in Ruby. It's returning extra zero at the beginning and end of the resulting array. Any fix/hack to get this work?

Since I wanted to get through this one before waiting for a bug fix, I added the following to the top of my function to flag the random tests. Then before returning the output, I add the leading and trailing zeros if it's a random test. The arrays in "not in" are the unique starting arrays and unique iteration counts in standard tests.

rand = False
if o not in [[1],[1,0,0,0,1,1],[1,1,1],[0],[1,0,-1,0,1,1],[-3],[1,0,987,0,1,1],[1,1,0,1,0,1,1,1,1,1,0,1]] or n not in [1,2,21,3,5,0,-3,75]:
rand = True

<-----CODE------>

if rand == True:
o.append(0),o.append(0)
o.insert(0,0),o.insert(0,0)

I am also having this problem. Random tests have one extra zero in the beginnig and end of result array.