Given two arrays of integers, preorder and inorder, where preorder represents the values of a preorder traversal of a binary tree, and inorder represents the values of an inorder traversal of the same tree, construct and return the binary tree from these traversals.
preorder: number[]: An array of positive integersinorder: number[]: An array of positive integersInput: preorder = [3,1,2,6,5,9], inorder = [1,2,3,5,6,9]Output: [3,1,6,null,2,5,9]Explanation: The root is 3, with left subtree [1, 2] and right subtree [6, 5, 9].
Input: preorder = [1,2,3], inorder = [3,2,1]Output: [1,2,null,3]Explanation: The root is 1, with left subtree [2, 3] and no right subtree.
Input: preorder = [7], inorder = [7]Output: [7]Explanation: The tree consists of a single node with the value 7, which is both the root and the only node.
TreeNode.val <= 1,000,000preorder and inorder contain unique valuesGiven two arrays of integers, preorder and inorder, where preorder represents the values of a preorder traversal of a binary tree, and inorder represents the values of an inorder traversal of the same tree, construct and return the binary tree from these traversals.
preorder: number[]: An array of positive integersinorder: number[]: An array of positive integersInput: preorder = [3,1,2,6,5,9], inorder = [1,2,3,5,6,9]Output: [3,1,6,null,2,5,9]Explanation: The root is 3, with left subtree [1, 2] and right subtree [6, 5, 9].
Input: preorder = [1,2,3], inorder = [3,2,1]Output: [1,2,null,3]Explanation: The root is 1, with left subtree [2, 3] and no right subtree.
Input: preorder = [7], inorder = [7]Output: [7]Explanation: The tree consists of a single node with the value 7, which is both the root and the only node.
TreeNode.val <= 1,000,000preorder and inorder contain unique valuesconsole.log() 语句将显示在此处。