[Solved] Suppose you want to extend serialization/deserialization to support binary trees where nodes can have duplicate values and you want... Which approach fundamentally changes the serialization method? | Tree: Depth-First Search

Tree: Depth-First Search - Serialize and Deserialize Binary Tree

Suppose you want to extend serialization/deserialization to support binary trees where nodes can have duplicate values and you want to reconstruct the tree uniquely. Which approach fundamentally changes the serialization method?

AUse preorder traversal with null markers as usual, since values don't affect structure.

BUse BFS serialization but omit null markers to reduce string size.

CSerialize only node values and rely on sorting during deserialization.

DAdd unique node IDs during serialization to distinguish duplicates.

Step-by-Step Solution

Solution:

Step 1: Understand duplicate value problem
Duplicate values mean value alone can't identify nodes uniquely.
Step 2: Analyze options
Omitting null markers breaks structure preservation, making reconstruction ambiguous. Sorting values loses structure. Adding unique IDs distinguishes nodes uniquely.
Step 3: Identify fundamental change
Adding unique IDs during serialization fundamentally changes the method to handle duplicates.
Final Answer:
Option D -> Option D
Quick Check:
Unique IDs enable unique reconstruction despite duplicate values [OK]

Quick Trick: Null markers are essential for unique reconstruction; unique IDs handle duplicates [OK]

Common Mistakes:

MISTAKES

Assuming values alone suffice
Ignoring null markers importance

Trap Explanation:

PITFALL

Candidates think duplicate values don't affect serialization structure.

Interviewer Note:

CONTEXT

Tests candidate's ability to handle serialization variants with duplicates.

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More Tree: Depth-First Search Quizzes

Which approach fundamentally changes the serialization method?

Step 1: Understand duplicate value problem

Step 2: Analyze options

Step 3: Identify fundamental change

Final Answer:

Quick Check:

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