我编写的实现单链表的程序

#includeusingnamespacestd;enumyaya{error,success};structnode{intdata;node*next;};classList{public:List();~List();intlength();yayaset_data(intn);node*get_ptr(intm);yayainset_node(intx,inty);intdelete_node(inti);voidput_in(intx);voidbreaktwo(List&la,List