Dijkstra通用算法，最近一段时间一直在搞图论的相关算法，发现Dijkstra是一个很好的单元最短路径算法，此程序很短，非常适合学习-Generic Dijkstra algorithm, the most recent period has been engaged in graph theory algorithms, Dijkstra is a good unit the shortest path algorithm, this procedure is very short, very suitable for learning