Optimize serialization for without recursion

Last updated: May 21, 2026

Quick Overview

Implement a function to serialize and deserialize a binary tree without using recursion. The input will be the root node of the binary tree, and the output should be a string representation of the serialized tree. The deserialization should reconstruct the original tree structure from the serialized string.

Walmart
Coding & Algorithms
Software Engineer
Walmart
May 21, 2026
Software Engineer
Take-home Project
Coding & Algorithms
Medium

107

5

4,454 solved


Implement a function to serialize and deserialize a binary tree without using recursion. The input will be the root node of the binary tree, and the output should be a string representation of the serialized tree. The deserialization should reconstruct the original tree structure from the serialized string.

How to Approach This
  1. Clarify input constraints and edge cases before writing code.
  2. Walk through your approach verbally and confirm with the interviewer before coding.
  3. Start with a brute force solution, then optimize. Mention time and space complexity.
  4. Test your solution with examples, including edge cases like empty input or duplicates.
  5. Consider common patterns: sliding window, two pointers, hash map, BFS/DFS, dynamic programming.
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Problem Analysis

The problem requires us to serialize and deserialize a binary tree without using recursion. This suggests that we will need to use an iterative approach. A suitable pattern for this problem is the 'le...

Approach
  1. Serialization: Use a queue to perform level-order traversal. Start by enqueueing the root node. For each node, add its value to the serialized string. If a node is null, add a placeholder (e.g....

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