public static IEnumerable <Graph> EnumerateClass(List <Graph> excluded, int maxVertices = int.MaxValue)
{
excluded.Sort((g1, g2) => g1.N.CompareTo(g2.N));
if (excluded.Count > 0 && excluded[0].N <= 1)
{
yield break;
}
yield return(new Graph(new List <int>()));
var lastLevel = new List <Graph>()
{
new Graph(new List <int>())
};
while (lastLevel.Count > 0)
{
var currentLevel = new List <Graph>();
foreach (var G in lastLevel)
{
List <List <int> > neighborSets;
if (G.IsComplete())
{
neighborSets = ListUtility.EnumerateSublists(Enumerable.Range(0, G.N).ToList()).Distinct(_sizeComparer).ToList();
}
else
{
neighborSets = ListUtility.GenerateSublists(Enumerable.Range(0, G.N).ToList());
}
foreach (var neighborSet in neighborSets.Where(l => l.Count > 0))
{
var H = G.AttachNewVertex(neighborSet);
if (currentLevel.Any(W => Graph.Isomorphic(H, W)))
{
continue;
}
if (excluded.Any(W => H.ContainsInduced(W)))
{
continue;
}
currentLevel.Add(H);
yield return(H);
}
}
if (currentLevel.Count > 0 && currentLevel[0].N >= maxVertices)
{
yield break;
}
lastLevel = currentLevel;
}
}