Count Nodes in a Binary Tree - aloalgo
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Count Nodes in a Binary Tree

Easy

You are given the root of a binary tree, return the total number of nodes in the tree.

Example 1

Input
124536
Output
6
Explanation:

The tree has 6 nodes: 1, 2, 3, 4, 5, 6.

Example 2

Input
1
Output
1
Explanation:

The tree consists of a single root node.

Example 3

Input
None
Output
0
Explanation:

An empty tree has no nodes.

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Case 1Case 2Case 3
Input
124536
Output
6
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