Yeah it was a simple bug, thanks for running my code and sorry for bothering you

I ran your code. no you don't.

0
3
1
10
2
40
3
90
4
160
0
3
9
810
After applying rank of 1 the resulting user rank was expected to be -2, but was actually 1: expected 1 to equal -2

Tests for Python are bugged. I have passed all tests expect those that should raise error, even though I'm raising it in the code