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Problem Challenge 3: Employee Free Time (hard)
Problem Statement
For ‘K’ employees, we are given a list of intervals representing each employee’s working hours. Our goal is to determine if there is a free interval which is common to all employees. You can assume that each list of employee working hours is sorted on the start time.
Example 1:
Input: Employee Working Hours=[[[1,3], [5,6]], [[2,3], [6,8]]]
Output: [3,5]
Explanation: All the employees are free between [3,5].
Example 2:
Input: Employee Working Hours=[[[1,3], [9,12]], [[2,4]], [[6,8]]]
Output: [4,6], [8,9]
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