LLD - Design — Elevator System
How can an elevator state machine handle simultaneous requests from multiple floors efficiently?
How can an elevator state machine handle simultaneous requests from multiple floors efficiently?
hard📝 Trade-off Q8 of Q15
Step-by-Step Solution
Solution:
Step 1: Understand multiple request challenge
Elevator must decide order to serve floors efficiently without unnecessary movement.Step 2: Use queue and prioritization
Maintaining a queue and prioritizing requests in current direction reduces wait time and travel.Final Answer:
By maintaining a queue of floor requests and prioritizing based on current direction -> Option CQuick Check:
Queue and priority [OK]
Quick Trick: Queue requests and prioritize direction [OK]
Common Mistakes:
MISTAKES- Ignoring requests after first
- Random floor selection
- Resetting state too often
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