[Solved] Identify the bug in the following trie-based maximum XOR code snippet: - Ans: Line with 'node = node.children[bit]' does not check if 'bit' exists in... | Bit Manipulation

Bit Manipulation - Maximum XOR of Two Numbers

Identify the bug in the following trie-based maximum XOR code snippet:

ALine with 'node = node.children[bit]' does not check if 'bit' exists in children.

BLine with 'if bit not in node.children:' should check for toggled_bit instead.

CLine with 'max_xor |= (1 << i)' should be outside the if condition.

DLine with 'node = self.root' should be inside the for loop.

Step-by-Step Solution

Solution:

Step 1: Analyze traversal in findMaxXor
When toggled_bit is not found, code moves to node.children[bit] without checking if bit exists, risking KeyError.
Step 2: Identify missing null check
Should use node.children.get(bit) or check existence before accessing to avoid runtime error.
Final Answer:
Option A -> Option A
Quick Check:
Missing check causes crash on inputs missing bit child [OK]

Quick Trick: Always check child existence before traversal [OK]

Common Mistakes:

MISTAKES

Trap Explanation:

PITFALL

Interviewer Note:

CONTEXT

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