Simple 3 lines of code => Sliding Window
IntuitionApproachComplexity
Time complexity:

Space complexity:
Code
# Intuition
<!-- Describe your first thoughts on how to solve this problem. -->

# Approach
<!-- Describe your approach to solving the problem. -->

# Complexity
- Time complexity:
<!-- Add your time complexity here, e.g. $$O(n)$$ -->

- Space complexity:
<!-- Add your space complexity here, e.g. $$O(n)$$ -->

# Code
```cpp []
class Solution {
public:
    vector<int> findClosestElements(vector<int>& arr, int k, int x) {
        int l = 0, r = arr.size() - 1;
        while (r - l >= k) abs(arr[l] - x) > abs(arr[r] - x) ? ++l : --r;
        return vector<int>(arr.begin() + l, arr.begin() + r + 1);
    }
};
```
['Two Pointers', 'Sliding Window', 'C++']