说明：  单源点最短路径算法的设计与实现 算法 SHORTEST-PATHS求出了v0至其它各结点的最短路径，但是没有给出这些最短路径。补充该算法，使新算法在找出这些最短路径长度的同时，也能求出路径上的结点序列。
(single source shortest path algorithm design and implementation of the algorithm SHORTEST- PATHS calculated the projectile to other nodes in the shortest path, but not given them the shortest path. Added the algorithm, the new algorithm to identify the shortest path length at the same time, they can be obtained on the path node sequence.)