Given a list nums of integers, return a new list containing only the unique elements from nums in the order of their first appearance. The input is a Python list, and the output must also be a Python list.
Constraints
0 <= len(nums) <= 10^5
-10^9 <= nums[i] <= 10^9
Preserve the order of first occurrence in the result
Function Signature
defunique_elements(nums):
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