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: [402, 163, 200, 51, 25, 229, 74, 242, 123, 267, 167, 91, 50, 166, 184, 452, 323, 315, 70, 177]
A: 
[402, 163, 200, 51, 452, 229, 74, 242, 123, 267, 167, 91, 50, 166, 184, 25, 323, 315, 70, 177]