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: [311, 319, 362, 321, 22, 213, 35, 453, 117, 287, 461, 66, 234, 37, 250, 470, 108, 25, 334, 387]

[311, 319, 362, 321, 470, 213, 35, 453, 117, 287, 461, 66, 234, 37, 250, 22, 108, 25, 334, 387]