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Grokking the Coding Interview Patterns

Solution: Employee Free Time

Explore how to determine common free time across multiple employees by merging overlapping intervals. Understand the use of a min-heap to efficiently manage and process schedules, and learn how to identify gaps indicating free periods for all employees. This lesson guides you through the step-by-step algorithm and its time and space complexity considerations.

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Statement

You’re given a list containing the schedules of multiple employees. Each person’s schedule is a list of non-overlapping intervals in a sorted order. An interval is specified with the start and end time, both being positive integers. Your task is to find the list of finite intervals representing the free time for all the employees.

Note: The common free intervals are calculated between the earliest start time and the latest end time of all meetings across all employees.

Constraints:

  • 1≤1 \leq schedule.length , schedule[i].length ≤50\leq 50

  • 0≤0 \leq interval.start < interval.end ≤108\leq 10^8 ...