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 number of towns and cities, into a single list to take the lead node. Nodes in the city information, including: City name, the city coordinates. Required to use the city name and location coordinates of the find, insert, delete, update, and other operations.