Thank you for your quick response :)

Pick py version 3.8

Unable to run the sample tests :

Traceback (most recent call last):
File "main.py", line 3, in
import codewars_test as test
ModuleNotFoundError: No module named 'codewars_test'

One might run those tests anyway by commenting out the second line : import codewars_test as test

But then again, when trying to attemt the tests :
Traceback (most recent call last):
File "main.py", line 3, in
import codewars_test as test
ModuleNotFoundError: No module named 'codewars_test'

Considering the author never properly enforced any performance requirements, I've removed the pseudo-big tests.

The problem description is NOT totally correct. it's not how many rats died. We have a total of 10 rats. That's it. These rats are put on position numbered from 0 to 9, so total 10 rats.
1000 bottles of wine are also numbered from 0 to 999. Then each bottle of wine is polled into the glasses in front of the rats according to the binary representation of the bottle number, that is: if the bottle number has bit 1 for position i (0<=i<=9), then poll wine into the glass of that position.
The numbers we received should be the position number of the rats.

bad test examples for squares. works only for a square of 2 units, where area and perimeter equal 4. You just ignore units and units^2.

oh ok i'm kinda new here thanks (:

It takes an advantage of poorly written tests

how does that even work

I added the example. Is it clearer now?

Yes, pls: add the ouput example to the instructions. That would be helpful.

No, you need to return one dimensional array, and in such array position of a queen is for each x in (0 ... size), queen[x] = (x, returned_array[x]). So, for example, if you return array [1, 3, 0, 2], it means that there are 4 queens at coordinates:

[0, 1],
[1, 3],
[2, 0],
[3, 2]

Since in this problem each queen position has different x, we do not have to return it explicitly because it can be expressed as index in returned_array.

Is it clearer now? Maybe I should add such example to the description.

But o why ???
It feels like it requires code to write this code.