Solution: Recover a Tree From Preorder Traversal
Explore how to reconstruct a binary tree from its preorder traversal string by counting dashes and parsing node values using a depth-first search approach. Learn to implement the algorithm efficiently with an understanding of its time and space complexities, enabling you to solve similar tree traversal problems confidently.
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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
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