private void GetLongestLink(IEdge edge)
{
int total = 0;
var visitedEdges = new HashSet<IEdge>();
if (edge.ConnectsBothEndWithSameColorEdges())
{
FullSearchLongestLink();
}
else // only connects on one side, but do not know which side
{
total += edge.Adjacent.Vertices.Sum(vertex => GetLongestLink(edge, vertex, visitedEdges));
total -= 1; // the current edge is counted twice
CompareLongestLink(total);
}
}