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Solution: The Number of the Smallest Unoccupied Chair

Discover how to assign the smallest unoccupied chair to friends arriving and leaving at different times by utilizing min heaps. Learn to efficiently manage chair allocation and release using priority queues, sort arrival times, and implement an optimized solution with O(n log n) complexity, preparing you for dynamic scheduling problems in coding interviews.

Statement

At a party, nn friends, numbered from 00 to n1n - 1, arrive and leave at different times. There are infinitely many chairs, numbered 00 onwards. Each arriving friend sits on the smallest available chair at that moment.

For example, ...