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Leetcode 1396. Design Underground System
Design a system that records passenger check-ins and check-outs and returns the average direct travel time between two stations. The core challenge is maintaining active check-ins per passenger id and aggregated travel-time statistics (sum and count) per station-pair to answer getAverageTime queries efficiently.
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Axon
Ramp
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All Regions
Mid March, 2026
Axon
Senior
Early March, 2026
Axon
Mid-level
Late October, 2025
Axon
Senior
Police officers report their timed GPS location to a dispatch center. Implement a function for the dispatch center to find an officer's location closest to a given time.
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