How to Solve Count Good Nodes in Binary Tree Problem
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Count Good Nodes in Binary Tree
Given a binary tree root, a node X in the tree is named good if in the path from root to X there are no nodes with a value greater than X. Return the number of good nodes in the binary tree.
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Understanding the Count Good Nodes in Binary Tree Problem
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Problem Statement
Given a binary tree root, a node X in the tree is named good if in the path from root to X there are no nodes with a value greater than X. Return the number of good nodes in the binary tree.
Count Good Nodes in Binary Tree
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Examples
root = [3,1,4,3,null,1,5]4Nodes in blue are good. Root Node (3) is always a good node. Node 4 -> (3,4) is the maximum value in the path starting from the root. Node 5 -> (3,4,5) is the maximum value in the path Node 3 -> (3,1,3) is the maximum value in the path.
root = [3,3,null,4,2]3Node 2 -> (3, 3, 2) is not good, because "3" is higher than it.
root = [1]1Root is considered as good.
Constraints
The number of nodes in the binary tree is in the range [1, 10^5].Each node's value is between [-10^4, 10^4].How Interview Coder Helps with Leetcode Problems
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