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: [272, 435, 256, 391, 402, 466, 428, 129, 110, 413, 65, 263, 174, 346, 98, 389, 62, 250, 169, 457]
Example Output: [272, 435, 256, 391, 402, 62, 428, 129, 110, 413, 65, 263, 174, 346, 98, 389, 466, 250, 169, 457]

Example Input: [103, 386, 52, 473, 420, 328, 316, 463, 427, 113, 384, 289, 204, 121, 100, 372, 25, 312, 34, 401]
Example Output: [103, 386, 52, 25, 420, 328, 316, 463, 427, 113, 384, 289, 204, 121, 100, 372, 473, 312, 34, 401]

Example Input: [157, 434, 175, 478, 388, 418, 362, 274, 292, 343, 81, 493, 447, 146, 125, 190, 134, 468, 104, 101]
Example Output:
[157, 434, 175, 478, 388, 418, 362, 274, 292, 343, 493, 81, 447, 146, 125, 190, 134, 468, 104, 101]