732. My Calendar III

732. My Calendar III

Implement a MyCalendarThree class to store your events. A new event can always be added.

Your class will have one method, book(int start, int end). Formally, this represents a booking on the half open interval [start, end), the range of real numbers x such that start <= x < end.

A K-booking happens when K events have some non-empty intersection (ie., there is some time that is common to all K events.)

For each call to the method MyCalendar.book, return an integer K representing the largest integer such that there exists a K-booking in the calendar.

Your class will be called like this: MyCalendarThree cal = new MyCalendarThree(); MyCalendarThree.book(start, end) Example 1:

MyCalendarThree();MyCalendarThree.book(10, 20); // returns 1MyCalendarThree.book(50, 60); // returns 1MyCalendarThree.book(10, 40); // returns 2MyCalendarThree.book(5, 15); // returns 3MyCalendarThree.book(5, 10); // returns 3MyCalendarThree.book(25, 55); // returns 3Explanation: The first two events can be booked and are disjoint, so the maximum K-booking is a 1-booking.The third event [10, 40) intersects the first event, and the maximum K-booking is a 2-booking.The remaining events cause the maximum K-booking to be only a 3-booking.Note that the last event locally causes a 2-booking, but the answer is still 3 becauseeg. [10, 20), [10, 40), and [5, 15) are still triple booked.

Note:

The number of calls to MyCalendarThree.book per test case will be at most 400. In calls to MyCalendarThree.book(start, end), start and end are integers in the range [0, 10^9].

class MyCalendarThree { TreeMap delta; public MyCalendarThree() { delta = new TreeMap(); } public int book(int start, int end) { delta.put(start, delta.getOrDefault(start, 0) + 1); delta.put(end, delta.getOrDefault(end, 0) - 1); int active = 0, ans = 0; for (int d: delta.values()) { active += d; if (active > ans) ans = active; } return ans; }}/** * Your MyCalendarThree object will be instantiated and called as such: * MyCalendarThree obj = new MyCalendarThree(); * int param_1 = obj.book(start,end); */

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