intersection of 2 arrays

class Solution {
public:
    vector<int> intersection(vector<int>& nums1, vector<int>& nums2) {
        sort(nums2.begin(),nums2.end());
        vector<int>r;
        for(auto u : nums1)
        {
            if(binary_search(nums2.begin(),nums2.end(),u))
              r.push_back(u);
        }
        sort(r.begin(),r.end());
        int s=unique(r.begin(),r.end())-r.begin();
        while(r.size()>s) r.pop_back();
        return r;
    }
};