Challenge: Print Pre-Order Traversal
Let’s print the pre-order traversal of a tree.
We'll cover the following
Problem
Given a binary tree, perform a pre-order traversal by completing the PrintPreOrder() function. A pre-order traversal is a traversal in which a node is visited first, then its left child, and finally its right child.
Input
A binary tree.
Output
Display pre-order traversal of the tree on the console.
Sample input
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