Package g0701_0800.s0731_my_calendar_ii

Class MyCalendarTwo

  • public class MyCalendarTwo
extends Object
    731 - My Calendar II.

    Medium

    You are implementing a program to use as your calendar. We can add a new event if adding the event will not cause a triple booking.

    A triple booking happens when three events have some non-empty intersection (i.e., some moment is common to all the three events.).

    The event can be represented as a pair of integers start and end that represents a booking on the half-open interval [start, end), the range of real numbers x such that start <= x < end.

    Implement the MyCalendarTwo class:

    • MyCalendarTwo() Initializes the calendar object.
    • boolean book(int start, int end) Returns 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.

    Example 1:

    Input

    [“MyCalendarTwo”, “book”, “book”, “book”, “book”, “book”, “book”]

    [ [], [10, 20], [50, 60], [10, 40], [5, 15], [5, 10], [25, 55]]

    Output: [null, true, true, true, false, true, true]

    Explanation:

     MyCalendarTwo myCalendarTwo = new MyCalendarTwo(); 
 myCalendarTwo.book(10, 20); // return True, The event can be booked. 
 myCalendarTwo.book(50, 60); // return True, The event can be booked. 
 myCalendarTwo.book(10, 40); // return True, The event can be double booked. 
 myCalendarTwo.book(5, 15); // return False, The event ca not be booked, because it would result in a triple booking. 
 myCalendarTwo.book(5, 10); // return True, The event can be booked, as it does not use time 10 which is already double booked. 
 myCalendarTwo.book(25, 55); // return True, The event 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.

    Constraints:

    • 0 <= start < end <= 109
    • At most 1000 calls will be made to book.

    • Constructor Detail

      • MyCalendarTwo

        public MyCalendarTwo()

    • Method Detail

      • book

        public boolean book​(int start,
                    int end)