Create my-calendar-ii.py

Author: kamyu104

Python/my-calendar-ii.py

@@ -0,0 +1,64 @@
+# Time:  O(n^2)
+# Space: O(n)
+
+# 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 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.
+#
+# Your class will be called like this: 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:
+# - The number of calls to MyCalendar.book per test case will be at most 1000.
+# - In calls to MyCalendar.book(start, end), start and end are integers in the range [0, 10^9].
+                                                       
+class MyCalendarTwo(object):
+
+    def __init__(self):
+        self.__overlaps = []
+        self.__calendar = []
+
+
+    def book(self, start, end):
+        """
+        :type start: int
+        :type end: int
+        :rtype: bool
+        """
+        for i, j in self.__overlaps:
+            if start < j and end > i:
+                return False
+        for i, j in self.__calendar:
+            if start < j and end > i:
+                self.__overlaps.append((max(start, i), min(end, j)))
+        self.__calendar.append((start, end))
+        return True
+
+
+# Your MyCalendarTwo object will be instantiated and called as such:
+# obj = MyCalendarTwo()
+# param_1 = obj.book(start,end)