Recover a Tree From Preorder Traversal
Explore how to reconstruct a binary tree from its preorder traversal string by interpreting depth and node values. Understand how depth-first search helps restore the original structure, including handling cases with single left children. Practice implementing this solution in a coding environment.
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Statement
We perform a preorder depth-first traversal on a binary tree starting from its root.
For each node, we first write D dashes, where D is the depth of the node in the tree, followed by the node’s integer value.
The root node has depth 0.
If a node is at depth D, its children (if any) will appear at depth D + 1.
If a node has only one child, it will always be the left child.
You are given the string representation of this traversal. Your task is to reconstruct the original binary tree and return its root. ...