LLD - Design — Chess Game
You need to design a game state manager that supports undo and redo of state changes. Which data structure combination is best suited for this?
You need to design a game state manager that supports undo and redo of state changes. Which data structure combination is best suited for this?
hard📝 Trade-off Q8 of Q15
Step-by-Step Solution
Solution:
Step 1: Understand undo/redo requirements
Undo requires going back to previous states; redo requires moving forward again.Step 2: Choose data structures supporting back and forth navigation
Two stacks allow pushing states on undo and redo stacks, enabling easy undo/redo operations.Final Answer:
Two stacks: one for undo, one for redo -> Option CQuick Check:
Undo/redo = two stacks [OK]
Quick Trick: Use two stacks to manage undo and redo efficiently [OK]
Common Mistakes:
MISTAKES- Using queue which is FIFO, not suitable
- Using singly linked list which lacks backward traversal
- Using hash map which doesn't track order
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