Practice Verify Preorder Serialization of a Binary Tree
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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 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. Note: You are not allowed to reconstruct the tree.
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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. Note: You are not allowed to reconstruct the tree.
Source: Verify Preorder Serialization of a Binary Tree on LeetCode. Use the original task for its coding environment and submissions.
Verify Preorder Serialization of a Binary Tree
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Examples
# Example 1
preorder = "9,3,4,#,#,1,#,#,2,#,6,#,#"
true
# Example 2
preorder = "1,#"
false
# Example 3
preorder = "9,#,#,1"
false
Constraints
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