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Learn Data Structures and Algorithms in Go

Problem:Construct Binary Tree from Preorder and Inorder Traversal

Explore how to reconstruct a binary tree from given preorder and inorder traversal arrays. Understand the recursive approach that identifies the root from preorder, partitions the inorder array, and builds left and right subtrees using efficient hashmap indexing. Gain insights into the time and space complexity of this method while implementing it in Go.

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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] ...