Hello, how much permutation i must to do for any test?

python fork

The description is little cryptic, I have to look at the examples to figure out the output. I don't know if you did that on purpose.

Randomness isn't actually required.

why not?

I will think how to fix this issue (or whether it really needs fixing ;) ).

Covering such scenario would need a carefully crafted data set, I think it won't be easy to get one randomly. I will think of something.

It seems to be better than other solution I checked(in codewars), because it calculate "0.1" * "2". And other decimal multiplication.
Other solutions I checked didn't work for decimal.

Just to say your code is clever. For mine I have used sklearn so I fill like cheating

double precision is enough ;)

Yes that's right!

That's O(n), and so it makes the code O(n^2), which is not desirable.