题解 | 合并区间

# class Interval:
#     def __init__(self, a=0, b=0):
#         self.start = a
#         self.end = b
#
# 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
#
# 
# @param intervals Interval类一维数组 
# @return Interval类一维数组
#
class Solution:
    def merge(self , intervals: List[Interval]) -> List[Interval]:
        # write code here
        if intervals == []: return []
        intervals.sort(key = lambda x:x.start)
        res = [intervals[0]]
        crt = 0
        for i in range(1, len(intervals)):
            if res[crt].end >= intervals[i].start:
                res[crt].end = max(intervals[i].end, res[crt].end)
            else:
                res.append(intervals[i])
                crt += 1
        return res

经典排序+贪心