Dijkstra算法是典型最短路算法，用于计算一个节点到其他所有节点的最短路径。主要特点是以起始点为中心向外层层扩展，直到扩展到终点为止。Dijkstra算法能得出最短路径的最优解-Dijkstra algorithm is a typical shortest path algorithm, to calculate a node to all other nodes of the shortest path. Main features is the starting point for the center outward layers of extended until the extension to the end up. Dijkstra shortest path algorithm to the optimal solution obtained