You are given a shcedule of tasks to work on. Each tasks has a start and an end time `[start, end]` where `end > start`. Find out for the given schedule:\n* in what intervals you are working (at least 1 task ongoing)\n* in what intervals you are multitasking (at least 2 tasks ongoing)\n\nIn other words, find union and intersection of a list of intervals. The input is sorted by start time.\n\n**Example:**\n**Input:** [[1, 10], [2, 6], [9, 12], [14, 16], [16, 17]]\n\n**Output union:** [[1, 12], [14, 17]]\n**Explanation:** We just need to merge overlapping intervals https://leetcode.com/problems/merge-intervals\n\n**Output intersection:** [[2, 6], [9, 10]]\n**Explanation:**\n![](https://i.imgur.com/nkY1cO9.png)

You are given a shcedule of tasks to work on. Each tasks has a start and an end time [start, end] where end > start. Find out for the given schedule:\n in what 