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Identify the bug in this move validation function:

medium📝 Analysis Q14 of 15
LLD - Design — Tic-Tac-Toe Game
Identify the bug in this move validation function:
def validate_move(move, max_position):
    if move.position <= 0 or move.position >= max_position:
        return False
    return True
AIt incorrectly disallows move.position = 0
BIt allows move.position = max_position which should be invalid
CIt uses wrong comparison operators for boundaries
DIt returns true for all positions
Step-by-Step Solution
Solution:
  1. Step 1: Analyze boundary conditions

    Condition disallows move.position <= 0, so position 0 is invalid.
  2. Step 2: Check if position 0 should be allowed

    Usually position 0 is valid boundary, so disallowing it is a bug.
  3. Final Answer:

    It incorrectly disallows move.position = 0 -> Option A
  4. Quick Check:

    Check boundary inclusiveness carefully [OK]
Quick Trick: Check if boundary conditions exclude valid edge values [OK]
Common Mistakes:
MISTAKES
  • Confusing < and <= in conditions
  • Assuming 0 is always invalid
  • Ignoring inclusive vs exclusive boundaries

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