LLD - Design — Elevator System
You are designing a multiple elevator coordination system for a 20-floor building with 4 elevators. To minimize average wait time during peak hours, which strategy is best?
You are designing a multiple elevator coordination system for a 20-floor building with 4 elevators. To minimize average wait time during peak hours, which strategy is best?
hard📝 Trade-off Q15 of Q15
Step-by-Step Solution
Solution:
Step 1: Understand peak hour challenges
High traffic causes many requests; serving all floors equally can cause delays and conflicts.Step 2: Evaluate zoning strategy
Dividing floors into zones and assigning elevators reduces travel distance and wait time by localizing service.Step 3: Compare other options
Random assignment or no zoning causes inefficiency; keeping elevators idle wastes capacity.Final Answer:
Divide floors into zones and assign elevators to zones dynamically -> Option BQuick Check:
Zoning elevators reduces wait time in tall buildings [OK]
Quick Trick: Use zoning to reduce travel distance and wait time [OK]
Common Mistakes:
MISTAKES- Ignoring zoning benefits in tall buildings
- Assuming random assignment balances load
- Keeping elevators idle wastes capacity
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