class Solution {
public:
    int totalHammingDistance(vector<int>& nums) {
        int ans=0;
        for(int i=0;i<nums.size();i++){
            int a=nums[i];
            for(int j=i+1;j<nums.size();j++){
                ans+=__builtin_popcount(nums[j]^a);

            }
        }



        return ans;
    }
};