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: [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]

Example Input: [82, 63, 259, 99, 462, 116, 461, 303, 58, 394, 358, 190, 218, 43, 108, 28, 174, 224, 492, 47]
Example Output: [82, 63, 259, 99, 462, 116, 461, 303, 58, 394, 358, 190, 218, 43, 108, 492, 174, 224, 28, 47]

Example Input: [314, 122, 249, 424, 38, 90, 272, 426, 97, 476, 491, 340, 312, 34, 311, 405, 438, 433, 301, 206]
Example Output:
[314, 122, 249, 424, 38, 90, 272, 426, 97, 476, 34, 340, 312, 491, 311, 405, 438, 433, 301, 206]