2966. Divide Array Into Arrays With Max Difference

class Solution {
public:
    vector<vector<int>> divideArray(vector<int>& nums, int k) {
        sort(nums.begin(), nums.end());
        vector<vector<int>>arr;
        int n = nums.size();
        for (int i = 0; i < n; i += 3) {
            vector<int>a;
            int x = nums[i + 2] - nums[i];
            if (x <= k ) {
                a.push_back(nums[i]);
                a.push_back(nums[i + 1]);
                a.push_back(nums[i + 2]);
            }
            else return {};
            arr.push_back(a);
        }
        return arr;
    }
};