Concatenation of Array

In this problem, we need to concatenate the given list to itself. In Python, this can be achieved simply by using the + operator, which can be used to concatenate two lists.

Here is the Python code to solve the problem:

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class Solution:
    def getConcatenation(self, nums: List[int]) -> List[int]:
        return nums + nums

In the code, nums + nums returns a new list that is the concatenation of the two nums lists. Therefore, this function always returns a list that is twice as long as the input list, with the second half identical to the first half.