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: [309, 15, 457, 143, 339, 76, 32, 107, 250, 228, 185, 484, 166, 172, 415, 264, 446, 278, 314, 34]
Example Output: [309, 484, 457, 143, 339, 76, 32, 107, 250, 228, 185, 15, 166, 172, 415, 264, 446, 278, 314, 34]

Example Input: [207, 308, 148, 303, 185, 297, 283, 217, 441, 433, 178, 486, 390, 228, 221, 489, 100, 299, 277, 452]
Example Output: [207, 308, 148, 303, 185, 297, 283, 217, 441, 433, 178, 486, 390, 228, 221, 100, 489, 299, 277, 452]

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