It is unclear to some students how constant maxEdges fits into
assignment 5.  Here is a definition of type Graph.

struct Graph
{
     int numOfVertices;
     int numOfEdges;
     Edge*   edges;
     int sizeOfArray;

     Graph(int n, int e)
     {
         numOfVertices = n;
         numOfEdges = 0;
         sizeOfArray = e;
         edges = new Edge[e];
      }
};

When main calls readGraph, it will say

  Graph* g = readGraph(maxEdges);

That is the only place where maxEdges comes into play.