We are given a list schedule of employees, which represents the working time for
each employee.
Each employee has a list of non-overlapping Intervals, and these intervals are
in sorted order.
Return the list of finite intervals representing common, positive-length free time for all employees, also in sorted order.
Example 1:
Input: schedule = [[[1,2],[5,6]],[[1,3]],[[4,10]]] Output: [[3,4]] Explanation: There are a total of three employees, and all common free time intervals would be [-inf, 1], [3, 4], [10, inf]. We discard any intervals that contain inf as they aren't finite.
Example 2:
Input: schedule = [[[1,3],[6,7]],[[2,4]],[[2,5],[9,12]]] Output: [[5,6],[7,9]]
(Even though we are representing Intervals in the form [x, y], the
objects inside are Intervals, not lists or arrays. For example, schedule[0][0].start
= 1, schedule[0][0].end = 2, and schedule[0][0][0] is not defined.)
Also, we wouldn't include intervals like [5, 5] in our answer, as they have zero length.
Note:
schedule and schedule[i] are lists with lengths in range
[1, 50].
0 <= schedule[i].start < schedule[i].end <= 10^8.NOTE: input types have been changed on June 17, 2019. Please reset to default code definition to get new method signature.