Solution.cpp

class MyHashMap {
public:
    int data[1000001];

    MyHashMap() {
        memset(data, -1, sizeof data);
    }

    void put(int key, int value) {
        data[key] = value;
    }

    int get(int key) {
        return data[key];
    }

    void remove(int key) {
        data[key] = -1;
    }
};

/**
 * Your MyHashMap object will be instantiated and called as such:
 * MyHashMap* obj = new MyHashMap();
 * obj->put(key,value);
 * int param_2 = obj->get(key);
 * obj->remove(key);
 */