leetcode.array--56. Merge Intervals
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题目:56. Merge Intervals
问题描述:https://leetcode.com/problems/merge-intervals/description/
题目意思呢,是要合并给出的区间组,并返回合并后的区间。例如:有区间组[[1,3],[2,6],[8,10],[15,18]],返回[[1,6],[8,10],[15,18]]。
我按照区间的起点升序排序,然后遍历一遍得到结果。这样时间复杂度是O(nlogn)。
Python:
from operator import attrgetterclass Solution(object): def merge(self, intervals): """ :type intervals: List[Interval] :rtype: List[Interval] """ length=len(intervals) if length==0: return [] if length<2: return [intervals[0]] intervals.sort(key=attrgetter("start")) res=[] res.append(intervals[0]) rear=0 for i in range(1,length): if intervals[i].start<=res[rear].end: if intervals[i].end>res[rear].end: res[rear].end=intervals[i].end else: res.append(intervals[i]) rear+=1 return res
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