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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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Apple
Leetcode 1396. Design Underground System
Reported Jun 5, 2026 · 1 source report
SENIOR
Source snapshot: Nov 12, 2026
View sourceAxon
Leetcode 1396. Design Underground System
Reported Mar 11, 2026 · 3 source reports
MID_LEVEL, SENIOR
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View sourceBloomberg
Leetcode 1396. Design Underground System
Reported Aug 7, 2026 · 4 source reports
SENIOR
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View sourceRamp
Leetcode 1396. Design Underground System
Reported Jul 29, 2025 · 1 source report
MID_LEVEL
Source snapshot: Nov 12, 2026