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Which Python code snippet correctly creates an NxN game board initialized with zeros for any integer n?

easy🧠 Conceptual Q3 of 15
LLD - Design — Tic-Tac-Toe Game
Which Python code snippet correctly creates an NxN game board initialized with zeros for any integer n?
Aboard = [[0]*n]*n
Bboard = [[0 for _ in range(n)] for _ in range(n)]
Cboard = [0]*n
Dboard = [[0]*n]
Step-by-Step Solution
Solution:

  1. Step 1: Understand list initialization in Python

    Using list comprehension creates independent inner lists.

  2. Step 2: Analyze options

    board = [[0 for _ in range(n)] for _ in range(n)] uses nested list comprehensions correctly. board = [[0]*n]*n creates shallow copies causing shared references.

  3. Final Answer:

    board = [[0 for _ in range(n)] for _ in range(n)] -> Option B

  4. Quick Check:

    List comprehension avoids shared references [OK]
Quick Trick: Use nested list comprehensions for independent rows [OK]
Common Mistakes:
MISTAKES
  • Using [[0]*n]*n causing shared inner lists
  • Initializing only one dimension
  • Confusing list multiplication with deep copy

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