# 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`.

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 1
MyCalendarThree.book(50, 60); // returns 1
MyCalendarThree.book(10, 40); // returns 2
MyCalendarThree.book(5, 15); // returns 3
MyCalendarThree.book(5, 10); // returns 3
MyCalendarThree.book(25, 55); // returns 3
Explanation:
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 because
eg. [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 {
public:
MyCalendarThree() {}

int book(int start, int end) {
++freq[start];
--freq[end];
int cnt = 0, mx = 0;
for (auto f : freq) {
cnt += f.second;
mx = max(mx, cnt);
}
return mx;
}

private:
map<int, int> freq;
};
``````

My Calendar II

My Calendar I

https://discuss.leetcode.com/topic/111978/java-c-clean-code

LeetCode All in One 题目讲解汇总(持续更新中…)

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