public void buildGraph(string filename)
{
using (StreamReader file = new StreamReader(filename))
{
string line = null;
char[] spaceDelim = { ' ' };
int numRouters = int.Parse(file.ReadLine());
for (int i = 0; i < numRouters; i++)
{
line = file.ReadLine();
Router r = new Router(numRouters);
r.distance[i] = 0; // distance to itself is 0
r.nextHop[i] = i; // next hop to itself is itself
string[] neighbors = line.Split(spaceDelim);
for (int j = 1; j < neighbors.Length; j += 2)
{
r.addNeighbor(neighbors[j][0] - 'A', neighbors[j + 1][0] - '0');
}
this.graph.Add(r);
}
}
}