Solution: Recover a Tree From Preorder Traversal
Explore how to recover a binary tree from a preorder traversal string using depth-first search. Understand parsing node depths with dashes, recursive construction of child nodes, and handling edge cases. This lesson helps you implement an efficient algorithm to rebuild the tree in a single pass, improving your binary tree and DFS skills.
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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.
Constraints:
The number of nodes in the original binary tree lies within the range
. node.data...