731

class MyCalendarTwo {
public:
    map<int, int> time;
    MyCalendarTwo() {

    }

    bool book(int start, int end) {
        time[start]++;
        time[end]--;
        int booked = 0;
        for(auto t : time) {
            booked += t.second;
            if(booked == 3) {
                time[start]--;
                time[end]++;
                return false;
            }
        }
        return true;
    }
};

/**
 * Your MyCalendarTwo object will be instantiated and called as such:
 * MyCalendarTwo* obj = new MyCalendarTwo();
 * bool param_1 = obj->book(start,end);
 */