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: [205, 479, 343, 263, 59, 164, 372, 22, 151, 72, 446, 471, 53, 114, 307, 405, 368, 427, 498, 195]
Example Output: [205, 479, 343, 263, 59, 164, 372, 498, 151, 72, 446, 471, 53, 114, 307, 405, 368, 427, 22, 195]

Example Input: [190, 43, 71, 390, 182, 235, 154, 282, 493, 69, 468, 317, 489, 132, 336, 375, 160, 432, 163, 374]
Example Output: [190, 493, 71, 390, 182, 235, 154, 282, 43, 69, 468, 317, 489, 132, 336, 375, 160, 432, 163, 374]

Example Input: [339, 229, 429, 239, 321, 334, 115, 36, 456, 269, 402, 483, 230, 453, 378, 262, 299, 227, 238, 268]
Example Output:
[339, 229, 429, 239, 321, 334, 115, 483, 456, 269, 402, 36, 230, 453, 378, 262, 299, 227, 238, 268]