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.

Example Input: [79, 236, 131, 353, 317, 265, 389, 82, 432, 453, 301, 226, 195, 91, 498, 316, 315, 172, 442, 439]
Example Output: [498, 236, 131, 353, 317, 265, 389, 82, 432, 453, 301, 226, 195, 91, 79, 316, 315, 172, 442, 439]

Example Input: [254, 409, 441, 99, 74, 292, 395, 136, 447, 233, 367, 112, 185, 327, 22, 454, 271, 319, 293, 200]
Example Output: [254, 409, 441, 99, 74, 292, 395, 136, 447, 233, 367, 112, 185, 327, 454, 22, 271, 319, 293, 200]

Example Input: [74, 53, 246, 327, 356, 92, 456, 452, 29, 209, 396, 463, 210, 324, 225, 89, 286, 122, 437, 118]
Example Output:
[74, 53, 246, 327, 356, 92, 456, 452, 463, 209, 396, 29, 210, 324, 225, 89, 286, 122, 437, 118]