用树的应用模拟铁路查询功能。掌握图的邻接表的定义及应用,能够熟练使用邻接表。加强对map容器的理解，能够熟练使用map容器，复习集合和字典的相关知识。理解最短路径问题，并使用Dijkstra算法解决最短路径问题。掌握线形表的使用，并理解优先队列解决问题的过程。利用栈解决需要逆向输出的问题。

-Application of simulation using the tree railway inquiry function. Master graph adjacency list of definitions and applications, able to skillfully use the adjacency list. Enhance the understanding of map containers, able to skillfully use the map container, collection and review of the relevant knowledge dictionary. Understanding of the shortest path problem, and use the Dijkstra shortest path algorithm to solve the problem. To master the use of linear form, and understand the priority queue problem-solving process. Use the stack to resolve the issue of the need to reverse the output.