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: [131, 212, 431, 43, 122, 473, 421, 142, 171, 252, 78, 68, 414, 329, 61, 283, 346, 284, 204, 381]
Example Output: [131, 212, 431, 473, 122, 43, 421, 142, 171, 252, 78, 68, 414, 329, 61, 283, 346, 284, 204, 381]

Example Input: [332, 68, 367, 40, 74, 273, 103, 130, 256, 381, 294, 376, 493, 307, 151, 37, 464, 456, 432, 272]
Example Output: [332, 68, 367, 40, 74, 273, 103, 130, 256, 381, 294, 376, 37, 307, 151, 493, 464, 456, 432, 272]

Example Input: [360, 195, 110, 450, 104, 17, 156, 344, 274, 289, 100, 277, 245, 381, 248, 172, 73, 238, 253, 357]
Example Output:
[360, 195, 110, 17, 104, 450, 156, 344, 274, 289, 100, 277, 245, 381, 248, 172, 73, 238, 253, 357]