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.

[81, 268, 174, 47, 16, 230, 165, 137, 291, 457, 188, 413, 36, 238, 454, 284, 115, 378, 356, 135]
[81, 268, 174, 47, 457, 230, 165, 137, 291, 16, 188, 413, 36, 238, 454, 284, 115, 378, 356, 135]

[47, 153, 471, 454, 207, 195, 168, 233, 408, 241, 442, 249, 36, 482, 226, 293, 170, 402, 452, 295]
[47, 153, 471, 454, 207, 195, 168, 233, 408, 241, 442, 249, 482, 36, 226, 293, 170, 402, 452, 295]

[442, 236, 497, 400, 458, 262, 338, 325, 251, 129, 425, 385, 465, 482, 345, 372, 337, 461, 486, 310]

[442, 236, 129, 400, 458, 262, 338, 325, 251, 497, 425, 385, 465, 482, 345, 372, 337, 461, 486, 310]