【Medium】 391. Number of Airplanes in the Sky

Given an interval list which are flying and landing time of the flight. How many airplanes are on the sky at most?

Notice:

• If landing and flying happens at the same time, we consider landing should happen at first.

Example:

For interval list

[
  (1,10),
  (2,3),
  (5,8),
  (4,7)
]

Return 3

解题思路

同【Medium】919. Meeting Rooms II。

核心代码

略。