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