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: [161, 38, 129, 34, 32, 387, 172, 89, 220, 189, 257, 229, 218, 43, 268, 39, 210, 411, 22, 99]
Example Output: [161, 38, 129, 34, 32, 387, 172, 89, 220, 189, 257, 229, 218, 43, 268, 39, 210, 22, 411, 99]

Example Input: [145, 414, 184, 316, 312, 330, 434, 182, 365, 119, 224, 393, 498, 19, 460, 157, 388, 57, 465, 315]
Example Output: [145, 414, 184, 316, 312, 330, 434, 182, 365, 119, 224, 393, 19, 498, 460, 157, 388, 57, 465, 315]

Example Input: [145, 256, 227, 230, 158, 361, 400, 68, 148, 15, 86, 454, 450, 102, 154, 451, 205, 199, 376, 364]
Example Output:
[145, 256, 227, 230, 158, 361, 400, 68, 148, 454, 86, 15, 450, 102, 154, 451, 205, 199, 376, 364]