neat

yup, it is the size of the grid, and i think maybe it's just a little more readable that way.

I came here to give the same comment.
Upvote this one instead.

Hi

What is the use of the 3rd parameter : size of the grid ?

The length of the 1st parameter : grid has the same value

I spent too much time like for 6 kyu task(

I gave up and look at the others'solution .

Surprise : the second one is very similar to mine

Strange !

Hi

I'm waiting for the python version to rank this kata , but IMHO it must be approximatively ranked as part II.
A bit more complex, but same mechanisms are involved.

Hi

No indications about the number of random tests : timed out with 100 passed tests ?

Hi
didn't know this sum function on lists , need to explore

Never would have thought of this, nice.

I am morally opposed to bare its, fight me :p

I'll take your word for it that it's all possible situations.

Forget, passed after rereading
Sorry

what about now?

you're absolutely right, please change that to use sample, there should be no duplicate choices, and then please self-approve that if there's nothing else that's jumping out at you.
I'm slightly mad about that you wrapped it up in a describe but that's okay.
the rationale with it is that those are all possible situations, any other combination/permutation one can come up with will be identical but with renamed symbols

This should do what you want in a more concise fashion. I'm not entirely sure what it is you want this for because we're super sleep deprived but the two are equivalent.