252. Meeting Rooms.py

# Given an array of meeting time intervals consisting of start and end times [[s1,e1],[s2,e2],...] (si < ei), determine if a person could attend all meetings.

# For example,
# Given [[0, 30],[5, 10],[15, 20]],
# return false.
# Definition for an interval.
# class Interval(object):
#     def __init__(self, s=0, e=0):
#         self.start = s
#         self.end = e

class Solution(object):
    def canAttendMeetings(self, intervals):
        """
        O(nlgn)
        :type intervals: List[Interval]
        :rtype: bool
        """
        intervals.sort(key=lambda x: x.start)
        for i in range(1, len(intervals)):
            if intervals[i].start < intervals[i-1].end:
                return False
        return True