Python 1-liner| | 92.77% speed, | 64.96% memory
\nclass Solution:\n    def getConcatenation(self, nums: List[int]) -> List[int]:\n\t\t       return nums+nums\n
```\nclass Solution:\n    def getConcatenation(self, nums: List[int]) -> List[int]:\n\t\t       return nums+nums\n```
['Python', 'Python3']