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Grokking the Coding Interview Patterns

Solution: Employee Free Time

Explore how to identify common free time intervals across multiple employees by merging their schedule intervals. Understand using a min-heap to efficiently manage overlapping intervals, track gaps, and extract free time periods with optimal time and space complexity.

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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 ...