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: [25, 198, 30, 463, 163, 442, 215, 415, 443, 402, 275, 82, 111, 137, 63, 421, 102, 305, 118, 404]

[463, 198, 30, 25, 163, 442, 215, 415, 443, 402, 275, 82, 111, 137, 63, 421, 102, 305, 118, 404]