LLD - Design — Elevator System
Which of the following is the correct way to represent the state transitions for a system with states
idle, moving up, and moving down?Which of the following is the correct way to represent the state transitions for a system with states idle, moving up, and moving down?
easy🧠 Conceptual Q12 of 15
Step-by-Step Solution
Solution:
Step 1: Identify valid transitions between states
The system can start idle, then move up or down, and return to idle after movement.Step 2: Check which option lists all valid transitions
idle -> moving up, idle -> moving down, moving up -> idle, moving down -> idle correctly lists transitions from idle to moving states and back to idle.Final Answer:
idle -> moving up, idle -> moving down, moving up -> idle, moving down -> idle -> Option DQuick Check:
Valid transitions include idle to moving and back [OK]
Quick Trick: State transitions must include all valid moves between states [OK]
Common Mistakes:
MISTAKES- Assuming linear transitions only
- Missing transitions back to idle
- Ignoring that moving up and down are separate states
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