Implement a
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
Your class will be called like this: MyCalendar.book
, return 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.MyCalendar cal = new MyCalendar();
MyCalendar.book(start, end)
Example 1:
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.
Note:
MyCalendar.book
per test case will be at most 1000
.MyCalendar.book(start, end)
, start
and end
are integers in the range [0, 10^9]
.暴解,没什么好说的
class MyCalendarTwo { private List<int[]> calender; private List<int[]> overlap; public MyCalendarTwo() { calender = new ArrayList<>(); overlap = new ArrayList<>(); } public boolean book(int start, int end) { for (int[] o : overlap) { if (o[0] < end && o[1] > start) return false; } for (int[] c : calender) { if (c[0] < end && c[1] > start) { overlap.add(new int[]{Math.max(c[0], start), Math.min(c[1], end)}); } } calender.add(new int[]{start, end}); return true; } } /** * Your MyCalendarTwo object will be instantiated and called as such: * MyCalendarTwo obj = new MyCalendarTwo(); * boolean param_1 = obj.book(start,end); */
Solution #2
ref: https://leetcode.com/problems/my-calendar-ii/solution/
用treemap,一样的复杂度
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