give integer array inorder postorder inorder inorder traversal binary tree postorder postorder traversal tree construct return binary tree Example 1input inorder 9315207 postorder 9157203output 3920nullnull157example 2input inorder 1 postorder 1output 1 Constraints1 inorderlength 3000postorderlength inorderlength3000 inorderi postorderi 3000inorder postorder consist unique valuesEach value postorder appear inorderinorder guarantee inorder traversal treepostorder guarantee postorder traversal tree