Solution: Binary Tree Postorder Traversal
C# solution for the Binary Tree Postorder Traversal problem using the Tree Depth-First Search pattern.
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Statement
Given the root node root of a binary tree, return the values of its nodes in postorder traversal order.
In postorder traversal, you visit the left subtree, then the right subtree, and finally the current node.
Note: A recursive approach is straightforward. Try to solve it using an iterative method.
Constraints:
The number of nodes in the tree is in the range
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