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Problem:Construct Binary Tree from Preorder and Inorder Traversal

Explore how to reconstruct a binary tree from given preorder and inorder traversal lists. Understand the recursive approach that uses a hashmap for fast lookups and a shared pointer to build left and right subtrees efficiently. This lesson helps you implement and analyze a solution with optimal time and space complexity for tree construction.

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Statement

You are given two integer arrays, preorder and inorder, representing the preorder traversal and inorder traversal of the same binary tree, respectively. Your task is to reconstruct and return the binary tree from these two traversal sequences.

Note: All values in the tree are unique, and every value present in inorder is also present in preorder.

Constraints:

  • 1≤1 \leq preorder.length ≤3000\leq 3000

  • inorder.length == preorder.length

  • −3000≤-3000 \leq preorder[i], inorder[i] ...