Construct Binary Tree from Preorder and Inorder
Given two integer arrays preorder and inorder where preorder is the preorder traversal of a binary tree and inorder is the inorder traversal of the same tree, construct and return the binary tree.
Construct Binary Tree from Preorder and Inorder

Given two integer arrays preorder and inorder where preorder is the preorder traversal of a binary tree and inorder is the inorder traversal of the same tree, construct and return the binary tree.

Example 1:
Input: {"preorder":[3,9,20,15,7],"inorder":[9,3,15,20,7]}
Output: [3,9,20,null,null,15,7]
Input
arr ={"preorder":[3,9,20,15,7],"inorder":[9,3,15,20,7]}

Start building

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