实现了Dijkstra算法，解决最短路径问题。-achieve the Dijkstra algorithm, the shortest path to solve the problem.

Dijkstra算法(单源最短路径) 单源最短路径问题,即在图中求出给定顶点到其它任一顶点的最短路径。-Algorithm (single-source shortest path) Dijkstra,single-source shortest path problem, namely to obtain a given vertex to any other vertex of the shortest path in the graph.