1．键盘输入一组元素，尾部插入法建立一个单向链表。 2．在单向链表中删除一个结点。 3．在链表中插入一个元素。 -1. Keyboard input a set of elements, was established by the end of a one-way linked list insertion. 2. In the one-way linked list to delete a node. 3. Insert an element in the list.