vector<int> intersection(vector<int>& nums1, vector<int>& nums2) {

        vector<int> res;
        vector<bool> tb(1000,false);
        for(int i:nums1)tb[i]=true;
        for(int i:nums2)
            if(tb[i]) 
            {
                tb[i]=false;
                res.push_back(i);
            }

            return res;
    }