如何将C程序转换为类

so I've been working on this program and its objective was to use recursion and an adjacency matrix to find how many possible routes a person could take to get through a subway system without going over a track more than once. That was self explanatory for me but now I'm lost on program 2 which is to do the same problem from program 1 in C++ and using three classes and recursion. The classes are suppose to be SubwaySystem, Station, and Track. I don't really know how to go about the transition from a simple adjacency matrix into three classes? It seems counterproductive since it seems more complicated. I have been working on it for a while know and I can't seem to utilize all three classes. so I've been working on this program and its ob