mq032.会议室II

class Solution:
    def minMeetingRooms(self, intervals: List[List[int]]) -> int:
        tmp = []
        for elem in intervals:
            tmp.append((elem[0], 1))
            tmp.append((elem[1], -1))
        ranked = sorted(tmp, key=lambda x: x)
        res = 0
        record = 0
        for t in ranked:
            record += t[1]
            res = max(res, record)
        return res