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 not intervals:
            return []
            
        intervals.sort(key=lambda x: x.start)
        merged = [intervals[0]]

        for current in intervals[1:]:
            last = merged[-1]

            if current.start <= last.end:
                merged[-1] = Interval(last.start, max(last.end, current.end))
            else:
                merged.append(current)

        return merged