In this task, you are given a list of unique integers you need to swap the positions of maximum and minimum element in the list and return the updated list.

[106, 196, 137, 46, 222, 397, 497, 442, 244, 464, 481, 303, 424, 177, 390, 143, 308, 422, 473, 82]
[106, 196, 137, 497, 222, 397, 46, 442, 244, 464, 481, 303, 424, 177, 390, 143, 308, 422, 473, 82]