Haven't been able to solve this yet, just wanted to suggest a couple of improvements to the description.

• I would note that the coordinates are in the domain of real numbers, because the description and the test cases kind of mislead into thinking that they are integers representing a 2D grid. I wrote an optimization based on that wrong assumption, which turned out to be useless. Also +1 on labelling this kata as performance.

• I am not able to import numpy (I get the "Don't import sys or a module that depends on it." error) but the description says "disallowed Python modules: SciPy" and does not mention numpy.