Which of the following problems CANNOT be solved by serializing and deserializing a binary tree using DFS or BFS with null markers?

easy🔍 Pattern Recognition Q2 of Q15

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

AReconstructing a binary tree from a preorder traversal with null markers.

BSerializing a graph with cycles into a string and reconstructing it exactly.

CSerializing a binary tree to a string and deserializing it back to the same tree.

DDeserializing a string representing a binary tree serialized with level order traversal.

Step-by-Step Solution

Solution:

Step 1: Analyze problem types
Options A, B, and D all relate to binary trees and use serialization with null markers or level order traversal.
Step 2: Identify the anti-pattern
Serializing a graph with cycles into a string and reconstructing it exactly involves graphs with cycles, which cannot be serialized/deserialized correctly using tree-based DFS/BFS with null markers due to cycles.
Final Answer:
Option B -> Option B
Quick Check:
Graphs with cycles require different serialization methods [OK]

Quick Trick: Graphs with cycles need special handling, not tree serialization [OK]

Common Mistakes:

MISTAKES

Trap Explanation:

PITFALL

Candidates often think BFS serialization applies to graphs, ignoring cycles and node revisits.

Interviewer Note:

CONTEXT

Tests candidate's ability to distinguish tree serialization from graph serialization.

Master "Serialize and Deserialize Binary Tree" in Tree: Depth-First Search

3 interactive learning modes - each teaches the same concept differently

Want More Practice?

15+ quiz questions · All difficulty levels · Free

More Tree: Depth-First Search Quizzes