题目：生成如下二叉树，并用深度先序遍历输出结果

要求：用程序实现

说明：先生成如下所示的二叉树，然后先序遍历输出其结果：1243576



-Title: Generation as a binary tree, and use the depth first traversing the output requirements: to achieve with the program Descr iption: Mr. into the binary tree as shown below, and then output the results of preorder traversal: 1243576