System design interview question
"Design a flight booking system. A traveller searches 'London to Tokyo, 12 March' and gets itineraries — direct flights, and connections through other cities. Prices depend on fare class and availability changes constantly. You do not own the inventory; airlines do."
search over a combinatorial itinerary space, plus the awkward reality that the inventory lives in systems you do not control. It is the hardest search problem in the booking family: the answer is not a list of items but a set of constructed multi-leg journeys, and the price of each depends on fare rules you must query.
On Practick another engineer interviews you live for 60 minutes on a question from this bank. They have the full interviewer guide beside the call: the answers to your clarifying questions, the numbers to hand out, a ladder of follow-ups and a scoring rubric. You get the model solution once the session settles. It is free: interview someone for an hour and you have earned your own.
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