```
public class MyCalendar
extends Object
```
729 - My Calendar I\. 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 **double booking**. A **double booking** happens when two events have some non-empty intersection (i.e., some moment is common to both 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 `MyCalendar` class: * `MyCalendar()` 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 **double booking**. Otherwise, return `false` and do not add the event to the calendar. **Example 1:** **Input** ["MyCalendar", "book", "book", "book"] [ [], [10, 20], [15, 25], [20, 30]] **Output:** [null, true, false, true] **Explanation:** MyCalendar myCalendar = new MyCalendar(); myCalendar.book(10, 20); // return True myCalendar.book(15, 25); // return False, It can not be booked because time 15 is already booked by another event. myCalendar.book(20, 30); // return True, The event can be booked, as the first event takes every time less than 20, but not including 20. **Constraints:** * 0 <= start < end <= 10⁹ * At most `1000` calls will be made to `book`.

public boolean book(int start,
                    int end)

Class MyCalendar