Python 3.10

Often i get output like this:

[
    ((-0.2129623804894449, 0.7707734797399344), (-0.20733777736872916, 0.7648529673512878)),
    ((-0.20733777736872916, 0.7648529673512878), (-0.2129623804894449, 0.7707734797399344))
] should equal [
    (-0.2129623804894449, 0.7707734797399344), (-0.20733777736872916, 0.7648529673512878)
]

when actually the two pair of points that my code outputs have the same distance (0.008166310501669808 if you check).
Also, my solution looks like O(nlogn) but it still goes out of time.

Returning "" (an empty string) crashes the program with C11, while it doesn't crash with C18.