建立一棵二叉排序树并输出该树的结构，然后让用户输入下列操作符：i(插入),s(查找),d(删除),p(输出结构),q(退出程序)，程序执行相应操作。-Create a binary sort tree and outputs the structure of the tree, and then let the user enter the following operators: i (insert), s (find), d (delete), p (output structure), q