give integer array preorder inorder preorder preorder traversal binary tree inorder inorder traversal tree construct return binary tree Example 1input preorder 3920157 inorder 9315207output 3920nullnull157example 2input preorder 1 inorder 1output 1 Constraints1 preorderlength 3000inorderlength preorderlength3000 preorderi inorderi 3000preorder inorder consist unique valueseach value inorder appear preorderpreorder guarantee preorder traversal treeinorder guarantee inorder traversal tree