生成如下二叉树，并用先序遍历输出结果 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 -Generate the following binary tree, and traversing the output with the first requirement: to achieve with the program Descr iption: President into the binary tree as shown below, a