二叉排序树的构建，采用llink-rlink方式存储二叉排序树，编写能够通过键盘输入建立二叉排序树，并在建立完立即在屏幕显示中序遍历结果的程序。-Construction of binary sort tree, using llink-rlink stored binary sort tree, the preparation can be established through the keyboard input binary sort tree, and immediately in t