How to Solve Verify Preorder Serialization of a Binary Tree Problem
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Verify Preorder Serialization of a Binary Tree
One way to serialize a binary tree is to use preorder 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 ...
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Understanding the Verify Preorder Serialization of a Binary Tree Problem
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Problem Statement
One way to serialize a binary tree is to use preorder 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 preorder, return true if it is a correct preorder traversal serialization of a binary tree. It is guaranteed that 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". Note: You are not allowed to reconstruct the tree.
Verify Preorder Serialization of a Binary Tree
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Examples
preorder = "9,3,4,#,#,1,#,#,2,#,6,#,#"truepreorder = "1,#"falsepreorder = "9,#,#,1"falseConstraints
1 <= preorder.length <= 104preorder consist of integers in the range [0, 100] and '#' separated by commas ','.How Interview Coder Helps with Leetcode Problems
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