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: [157, 434, 175, 478, 388, 418, 362, 274, 292, 343, 81, 493, 447, 146, 125, 190, 134, 468, 104, 101]
A: 
[157, 434, 175, 478, 388, 418, 362, 274, 292, 343, 493, 81, 447, 146, 125, 190, 134, 468, 104, 101]