主要是利用加权有向图对城市交通网进行建模，通过求解交通导航问题，熟悉图结构的储存、表示和操作，同时加深理解加权有向图的连通性判断和全源最短路径算法。-Mainly using a weighted directed graph modeling for urban traffic network by solving traffic navigation problems, get familiar store showing the structure of representation an