Python, LintCode, 391. 数飞机

最新推荐文章于 2022-01-13 15:08:10 发布

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"""
Definition of Interval.
class Interval(object):
    def __init__(self, start, end):
        self.start = start
        self.end = end
"""

class Solution:  
    # @param airplanes, a list of Interval  
    # @return an integer  
    def countOfAirplanes(self, airplanes):  
        # write your code here 
        count = 0
        count_max = 0
        time_dict = {}
        time_list = []
        for i in range(len(airplanes)):
            if not airplanes[i].start in time_list:
                time_list.append(airplanes[i].start)
            if not airplanes[i].end in time_list:
                time_list.append(airplanes[i].end)
            if airplanes[i].start in time_dict:
                time_dict[airplanes[i].start] += 1
            else:
                time_dict[airplanes[i].start] = 1
            if airplanes[i].end in time_dict:
                time_dict[airplanes[i].end] -= 1
            else:
                time_dict[airplanes[i].end] = -1
        time_list.sort()
        for i in range(len(time_list)):
            count += time_dict[time_list[i]]
            count_max = max(count, count_max)
        return count_max

"""
Definition of Interval.
class Interval(object):
    def __init__(self, start, end):
        self.start = start
        self.end = end
"""

class Solution:
    """
    @param airplanes: An interval array
    @return: Count of airplanes are in the sky.
    """
    def countOfAirplanes(self, airplanes):
        # write your code here
        if len(airplanes) == 0:
            return 0
        airplanes.sort(key = lambda interval_tmp: interval_tmp.end)    
        res = {}
        for i in range(len(airplanes)):   
            keys_tmp = list(res.keys())
            for j in range(len(res)): 
                if not (airplanes[i].start >= keys_tmp[j].end or airplanes[i].end <= keys_tmp[j].start):
                    tmp_min = max(airplanes[i].start, keys_tmp[j].start)
                    tmp_max = min(airplanes[i].end, keys_tmp[j].end)
                    interval_tmp =  Interval(tmp_min, tmp_max)
                    res[interval_tmp] = res[keys_tmp[j]] + 1
                    del res[keys_tmp[j]]
            res[airplanes[i]] = 1
        return max(res.values())