打卡题目：leetcode第57题，插入区间
    相似题目：56
    image.png

    【代码】

    1. class Solution:
    2.     def insert(self, intervals: List[List[int]], newInterval: List[int]) -> List[List[int]]:
    3.         intervals.append(newInterval)
    4.         intervals = sorted(intervals, key=lambda x:(x[0], x[1]))
    5.         index = 0
    6.         while index<len(intervals)-1:
    7.             # 合并删除
    8.             if intervals[index][1]>=intervals[index+1][0]:
    9.                 intervals[index][1] = max(intervals[index][1], intervals[index+1][1])
    10.                 intervals.pop(index+1)
    11.             else:
    12.                 index += 1
    13.         return intervals