最短路径算法，通过本程序，能够清晰的明白算法的原理，并且程序能够很清楚的描述算法，对于想了解算法的人，也是非常不错的选择-Shortest path algorithm, through this program, can clearly understand algorithm principle, and the program can be very clear descr iption of the algorithm, for people who want to know the a