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: [175, 226, 366, 453, 182, 275, 23, 361, 118, 387, 90, 312, 310, 227, 404, 230, 337, 111, 66, 420]

[175, 226, 366, 23, 182, 275, 453, 361, 118, 387, 90, 312, 310, 227, 404, 230, 337, 111, 66, 420]