Leetcode 1929 Python, Concatenation of Array

Problem

Given an integer array nums of length n, you want to create an array ans of length 2n whereans[i]==nums[i] and ans[i + n] ==nums[i] for 0 <= i < n (0 indexed). Specifically, ans is the concatenation of two nums arrays. Return the array ans.

Solution 1

def arrayConcatenation(nums):
    nums = [1,2,3]
    ans = nums + nums
    return ans

Solution 2

• Take an array and append it to itself

class Solution:
    def arrayConcatenation(self, nums):
        ans =[]
        for i in range(2):
            for n in nums:
                ans.append(n)
        return ans