城市链表

将若干城市的信息，存入一个带头结点的单链表。结点中的城市信息包括：城市名，城

市的位置坐标。要求能够利用城市名和位置坐标进行有关查找、插入、删除、更新等操作。-The city will list a number of city information, take the lead into a single linked list node. Node of city information including: a city name, city location coordinates. Request to use a city name and location coordinates for the find, insert, delete, update and other operations.