Solution: Count Complete Tree Nodes
C# solution for the Count Complete Tree Nodes problem using the Tree Depth-First Search pattern.
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Statement
Given the root node root of a complete binary tree, return the total number of nodes in the tree.
A complete binary tree is a binary tree where every level, except possibly the last, is completely filled, and all nodes in the last level are as far left as possible.
Note: The input tree is guaranteed to be complete.
Constraints:
The number of nodes in the tree is in the range
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