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.

[337, 269, 373, 439, 95, 446, 50, 333, 16, 318, 259, 342, 224, 461, 52, 171, 154, 193, 395, 122]
[337, 269, 373, 439, 95, 446, 50, 333, 461, 318, 259, 342, 224, 16, 52, 171, 154, 193, 395, 122]