why is it

Question

dont understand
https://code.sololearn.com/W0vq5WK4WLLJ/?ref=app

Answer 1

What exactly is it that you don't understand?

Answer 2

Joaquin seems to be active recently. If you have questions about the code, you should post a comment on the code (the icon is toward the middle and looks like a chat bubble) and ask Joaquin directly.