Verify Preorder Serialization of a Binary Tree - Coddicted

Verify Preorder Serialization of a Binary Tree 1

Title: Verify Preorder Serialization of a Binary Tree Source:

One way to serialize a binary tree is to use pre-order traversal. When we encounter a non-null node, we record the node’s value. If it is a null node, we record using a sentinel value such as #.

For example, the above binary tree can be serialized to the string "9,3,4,#,#,1,#,#,2,#,6,#,#", where # represents a null node.

Given a string of comma separated values, verify whether it is a correct preorder traversal serialization of a binary tree. Find an algorithm without reconstructing the tree.

Each comma separated value in the string must be either an integer or a character '#' representing null pointer.

You may assume that the input format is always valid, for example it could never contain two consecutive commas such as "1,,3".

Example 1:
Return true

Example 2:
Return false

Example 3:
Return false

Java solution

Python solution

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One comment on “Verify Preorder Serialization of a Binary Tree

  1. Reply priyatamil Mar 30,2016 4:44 pm

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