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。-Several cities in the information into a single linked list node to take the lead. Nodes in the city information including: city name, the city' s location coordinates. Requires the ability to use the city name and location coordinates for the search, insert, delete, update, and other operations.