1929. Concatenation of Array

#### QUESTION:

Given an integer array nums of length n, you want to 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]
Explanation: The array ans is formed as follows:
- ans = [nums[0],nums[1],nums[2],nums[0],nums[1],nums[2]]
- ans = [1,2,1,1,2,1]
``````

Example 2:

``````Input: nums = [1,3,2,1]
Output: [1,3,2,1,1,3,2,1]
Explanation: The array ans is formed as follows:
- ans = [nums[0],nums[1],nums[2],nums[3],nums[0],nums[1],nums[2],nums[3]]
- ans = [1,3,2,1,1,3,2,1]
``````

Constraints:

``````n == nums.length
1 <= n <= 1000
1 <= nums[i] <= 1000
``````

#### SOLUTION:

``````class Solution {
fun getConcatenation(nums: IntArray): IntArray {
var result = IntArray(nums.size * 2)
for (i in result.indices) result[i] = nums[i % nums.size]
return result
}
}
``````
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