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.

[79, 333, 195, 449, 374, 267, 294, 64, 344, 237, 433, 385, 315, 185, 66, 473, 359, 265, 469, 120]
[79, 333, 195, 449, 374, 267, 294, 473, 344, 237, 433, 385, 315, 185, 66, 64, 359, 265, 469, 120]