477. Total Hamming Distance

class Solution {
public:
    int totalHammingDistance(vector<int>& nums) {
        int res = ;
        for (int i = ; i < ; i++) {
            int ones = ;
            for (int n : nums) {
                if (n & ( << i)) {
                    ones++;
                }
            }
            res += ones * (nums.size()-ones);
        }
        return res;
    }
};