Thanks for the second answer. I created a copy of the array to work on and it works now.

Please google
"IndexError: list index out of range".

Secondly, don't mutate the array.

I honestly don't know. I mean, I do iterate over the array, but as far as I can see, I catch all the border cases. I've even written some extra tests for these cases(empty array, array of only same numbers, array of increasing numbers etc.), but they all run through smoothly. The whole error message reads a little as if there was a problem with the reference solution, but I'm not sure.

Traceback (most recent call last):
File "main.py", line 31, in
Test.assert_equals(solve(arr),solve_Uyx2(arr))
File "main.py", line 21, in solve_Uyx2
res = []; t = arr[-1]; res.append(t)
IndexError: list index out of range

Why do you think you get this error?

Hey guys, my basic tests all run through, but when I attempt the random tests I get the following error:
IndexError: list index out of range
Anyone else had this issue?