Formatted question description: https://leetcode.ca/all/731.html
731. My Calendar II
MyCalendarTwo class to store your events. A new event can be added if adding the event will not cause a triple booking.
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 triple booking happens when three events have some non-empty intersection (ie., there is some time that is common to all 3 events.)
For each call to the method
true if the event can be added to the calendar successfully without causing a triple booking. Otherwise, return
false and do not add the event to the calendar.
Your class will be called like this:
MyCalendar cal = new MyCalendar();
MyCalendar(); MyCalendar.book(10, 20); // returns true MyCalendar.book(50, 60); // returns true MyCalendar.book(10, 40); // returns true MyCalendar.book(5, 15); // returns false MyCalendar.book(5, 10); // returns true MyCalendar.book(25, 55); // returns true Explanation: The first two events can be booked. The third event can be double booked. The fourth event (5, 15) can't be booked, because it would result in a triple booking. The fifth event (5, 10) can be booked, as it does not use time 10 which is already double booked. The sixth event (25, 55) can be booked, as the time in [25, 40) will be double booked with the third event; the time [40, 50) will be single booked, and the time [50, 55) will be double booked with the second event.
- The number of calls to
MyCalendar.bookper test case will be at most
- In calls to
endare integers in the range
Use two lists to store the intervals of booking and the overlapping intervals, which are both sorted. Each time
book(int start, int end) is called, loop over the list of overlaps to see whether there will be a new overlap.
- If so, then adding the new interval will cause a triple booking, so return
- Otherwise, add the new interval and the new overlapping intervals into the two list respectively, sort the two lists, and return