Hi @bbayeste,
I took a look at your notebook, and everything seems to be working fine. However, I noticed that in UNQ_C3 there’s an approx expected output, which in case of running your notebook I got as:
In my opinion, that’s a big difference in value, but apparently that’s what you also get when running it with official solution. I’m thinking, since this is approx value, sometimes the grader might not be satisfied with what you are getting, which is why you eventually ended up getting 40/50 after a few tries. Maybe if you try a bit more, you could get full.
I have taken a note of this and I shall pass this along to the team.
Happy learning,
Mubsi