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: [406, 96, 257, 366, 379, 330, 393, 91, 131, 465, 210, 135, 385, 484, 295, 201, 146, 94, 342, 205]
Example Output: [406, 96, 257, 366, 379, 330, 393, 484, 131, 465, 210, 135, 385, 91, 295, 201, 146, 94, 342, 205]

Example Input: [486, 158, 150, 357, 48, 239, 117, 35, 294, 107, 427, 359, 360, 36, 121, 95, 247, 100, 314, 92]
Example Output: [35, 158, 150, 357, 48, 239, 117, 486, 294, 107, 427, 359, 360, 36, 121, 95, 247, 100, 314, 92]

Example Input: [312, 141, 46, 17, 455, 129, 163, 108, 176, 446, 407, 149, 57, 221, 402, 208, 198, 228, 329, 64]
Example Output:
[312, 141, 46, 455, 17, 129, 163, 108, 176, 446, 407, 149, 57, 221, 402, 208, 198, 228, 329, 64]