本为电话号码查询系统，其中avltree的删除在书上没有，这是仿照殷人昆 数据结构 写的，与其的插入函数对应，在源码中自己找吧^_^-The telephone number for the query system, delete the avltree not in the book, which is modeled on Queensland data structure殷人written, instead of inserting the corresponding function in the source code of their own to find it ^ _ ^