[Solved] Given two elevators: Elevator 1 at floor 2 moving up with destinations [5, 8], Elevator 2 at floor 6 moving down with destinations [3, 1].... Which elevator should be assigned? | LLD

LLD - Design — Elevator System

Given two elevators: Elevator 1 at floor 2 moving up with destinations [5, 8], Elevator 2 at floor 6 moving down with destinations [3, 1]. A request comes from floor 4 to go up. Which elevator should be assigned?

AEither elevator

BElevator 2

CElevator 1

DNeither elevator

Step-by-Step Solution

Solution:

Step 1: Analyze elevator positions and directions
Elevator 1 is below floor 4 and moving up, so it can pick up at floor 4 on its way.
Step 2: Evaluate Elevator 2
Elevator 2 is above floor 4 but moving down, so it would need to reverse direction to pick up at floor 4.
Final Answer:
Elevator 1 -> Option C
Quick Check:
Best elevator = Elevator 1 [OK]

Quick Trick: Choose elevator moving towards request floor [OK]

Common Mistakes:

MISTAKES

Ignoring elevator direction
Choosing elevator farther away
Assuming either elevator works

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Which elevator should be assigned?

Step 1: Analyze elevator positions and directions

Step 2: Evaluate Elevator 2

Final Answer:

Quick Check:

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