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.
Q: [320, 36, 433, 155, 388, 25, 359, 396, 90, 98, 153, 355, 352, 111, 440, 437, 139, 470, 370, 416]
A: 
[320, 36, 433, 155, 388, 470, 359, 396, 90, 98, 153, 355, 352, 111, 440, 437, 139, 25, 370, 416]