改进的Dijkstra寻径算法，用来找到从源点到目的节点的前k条最短路径-improved routing algorithm used to find from source to destination node of the first k Shortest Path

In this report, we study on the intermodal transportation system of Pearl River Delta city group. In the system, each city is regarded as a node. For convenience, we remove some unimportant cities and simplify the system from 14 nodes to 5 nodes. Bec