System design interview question
"Design a hotel booking system. Guests search for available rooms over a date range, and book. A hotel has a limited number of rooms of each type, and — importantly — hotels deliberately overbook, because a predictable share of guests do not show up. Half a million properties worldwide."
inventory over date ranges, which is meaningfully harder than a simple count, plus the deliberate overbooking policy that makes this domain distinctive. The distinguishing content is: why availability is a range query rather than a lookup, the concurrency problem when two guests book the last room, and that overbooking is a revenue-optimization decision the system must support rather than a bug to prevent.
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