设二叉树的结点的数据场之值仅为一大写英文字母。其前序和中序的遍历结果（打印结点的数据场之值）分别保存在字符串数组 preorder[N] 及 inorder[N]之中，其中 N 为常数。请设计程序以标准形式存储保存该二叉树。-Based binary tree node data field of the value is only a capital letter. The pre-order traversal order and the results (the data field to print the node value) were stored in an array of strings preorder [N] and inorder [N], of which N is a constant. Please design process to save the binary tree stored in standard form.