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: [243, 312, 181, 499, 87, 173, 341, 443, 203, 314, 47, 198, 152, 41, 208, 184, 274, 437, 26, 226]
Example Output: [243, 312, 181, 26, 87, 173, 341, 443, 203, 314, 47, 198, 152, 41, 208, 184, 274, 437, 499, 226]

Example Input: [101, 177, 83, 449, 133, 367, 185, 153, 340, 274, 445, 96, 173, 65, 417, 426, 310, 459, 446, 211]
Example Output: [101, 177, 83, 449, 133, 367, 185, 153, 340, 274, 445, 96, 173, 459, 417, 426, 310, 65, 446, 211]

Example Input: [33, 439, 485, 138, 228, 443, 339, 421, 118, 21, 215, 182, 220, 265, 186, 153, 160, 43, 213, 256]
Example Output:
[33, 439, 21, 138, 228, 443, 339, 421, 118, 485, 215, 182, 220, 265, 186, 153, 160, 43, 213, 256]