English
1929. Concatenation of Array
Problem Statement
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]```
<p><strong class="example">Example 2:</strong></p>
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]
<p> </p>
<p><strong>Constraints:</strong></p>
<ul>
<li><code>n == nums.length</code></li>
<li><code>1 <= n <= 1000</code></li>
<li><code>1 <= nums[i] <= 1000</code></li>
</ul>
::: details _Click to open Hints_
- Build an array of size 2 * n and assign num[i] to ans[i] and ans[i + n]
:::
## Solution:
::: code-group
```rs [Rust]
impl Solution {
pub fn get_concatenation(nums: Vec<i32>) -> Vec<i32> {
let mut result = nums.clone();
result.extend(nums);
result
}
}
:::
...