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class Solution {
public:
    vector<int> intersection(vector<int> a, vector<int> b) {
        vector<int> subset;
        map<int,bool> m;
        for(int i=0;i<a.size();i++){
            m[a[i]]=true;
        }
        for(int j=0;j<b.size();j++){
            if(m[b[j]]){
                subset.push_back(b[j]);
                m[b[j]]=false;
            }
        }
        return subset;
    }
};