Note Given binary tree {1,#,2,3}, 1 \ 2 / 3 return [1,2,3]. Example Challenge Can you do it without recursion? Tags Expand Tree Binary Tree */ /** * Approach 1: Recursion * If we want to implement the ...

**Traversal**: The code performs a preorder traversal of the binary tree. In preorder traversal, each node is visited once in the order: root, left subtree, and then right subtree.

Is there any way to implement a nonrecursive preorder traversal of a binary tree without using a stack? In a standalone function?the recursive preorder ...