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Quick Summary
Assign car IDs to overlapping time intervals based on availability rules.
Reuse the smallest available car ID whenever a reservation ends before a new one starts.
Return the final assignments in the exact order of the input array.
What This Tests
Interval scheduling and event processing
Dynamic resource allocation using priority queues
Greedy decision making under constraints
Index preservation and data structure synchronization
Common Patterns
Heap / Priority Queue
Sorting
Greedy
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