.建立一个全国铁路交通咨询系统，该系统具备自动查找任意两城市间铁路交通的最短路径和最少花费的功能。-. To establish a national rail transportation consulting system, the system automatically looks for any two cities with rail traffic between the shortest path and minimum cost function.

全国交通咨询管理系统，提供最短路径算法等一系列应用，适合初学者学习。-National Transport Advisory management system, providing the shortest path algorithm and a series of applications, suitable for beginners to learn.

全国交通咨询模拟完整正确的代码，注有系统要求等。-the correct and complete code for national transportation consultation