class MyHashSet {

public:

    /** Initialize your data structure here. */

    MyHashSet() {

        data.resize(, );

    }

    void add(int key) {

        data[key] = ;

    }

    void remove(int key) {

        data[key] = ;

    }

    /** Returns true if this set contains the specified element */

    bool contains(int key) {

        //if(data[key]==1) return true;

        //else return false;

        return data[key]==;

    }

    vector<int> data;

};

/**

 * Your MyHashSet object will be instantiated and called as such:

 * MyHashSet* obj = new MyHashSet();

 * obj->add(key);

 * obj->remove(key);

 * bool param_3 = obj->contains(key);

 */