Concatenation of Array
Given an integer array nums of length n, create an array ans of length 2n where ans[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.
Example 1
Input
nums = [1,2,1]Output
[1,2,1,1,2,1]The array ans is formed by listing nums once and then listing nums again, resulting in [1,2,1,1,2,1].
Example 2
Input
nums = [1,3,2,1]Output
[1,3,2,1,1,3,2,1]The array ans is formed by listing nums once and then listing nums again, resulting in [1,3,2,1,1,3,2,1].
Constraints
- n == nums.length
- 1 <= n <= 1000
- 1 <= nums[i] <= 1000