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Serialize and Deserialize Binary Tree Leetcode solution

Tags: leetcode java python design

Serialization is the process of converting a data structure or object into a sequence of bits so that it can be stored in a file or memory buffer, or transmitted across a network connection link to be reconstructed later in the same or another computer environment.

Design an algorithm to serialize and deserialize a binary tree. There is no restriction on how your serialization/deserialization algorithm should work. You just need to ensure that a binary tree can be serialized to a string and this string can be deserialized to the original tree structure.

Clarification: The input/output format is the same as how LeetCode serializes a binary tree. You do not necessarily need to follow this format, so please be creative and come up with different approaches yourself.


Lets first implement serialize method. We will use a pre order traversal. Just to revise preorder traversal, the sequence is

For deserialize we will first split the string by a serpator (we are using comma as a separtor). Next we will consruct the tree from the string.


Time Complexity of Preorder traversal is $$O(n)$$

Space complexity is $$O(n)$$

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