void ComputeHashCode()
{
_hashCode = (int)(N);
UpdateHash(ref _hashCode, (long)(Turn));
Degrees.Clear();
DegreeChangeIndices.Clear();
Degrees.AddRange(PotSet.Select(c => new Tuple <int, int>(c, Stacks.Count(s => s.IsBitSet(c)))).Where(x => x.Item2 > 0).OrderBy(x => x.Item2));
var previousDegree = -1;
for (int i = 0; i < Degrees.Count; i++)
{
var degree = Degrees[i];
UpdateHash(ref _hashCode, degree.Item2);
if (degree.Item2 != previousDegree)
{
DegreeChangeIndices.Add(i);
previousDegree = degree.Item2;
}
}
DegreeChangeIndices.Add(Degrees.Count);
}