Definition: 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.
Input: [81, 11, 403, 239, 205, 314, 133, 225, 432, 493, 476, 322, 104, 145, 446, 117, 276, 252, 255, 434]
Output:
[81, 493, 403, 239, 205, 314, 133, 225, 432, 11, 476, 322, 104, 145, 446, 117, 276, 252, 255, 434]