static SudokuCandidate[] Filter(SudokuSolver ss, int cage, Func <int, bool> included)
{
int Cells = ss.Cells;
List <SudokuCandidate> toRemove = new List <SudokuCandidate>();
for (int i = 0; i < Cells; ++i)
{
if (!included(i + 1))
{
CageOptional co = ss.GetCageOptional(cage, i);
if (co.Included)
{
foreach (SudokuCandidate sc in co.UnselectedCandidates)
{
if (!sc.IsMarked)
{
toRemove.Add(sc);
sc.MarkCandidate(true);
}
}
}
}
}
SudokuCandidate[] removed = toRemove.ToArray();
for (int i = 0; i < removed.Length; ++i)
{
SudokuCandidate sc = removed[i];
ss.DiscardCandidate(sc);
sc.MarkCandidate(false);
}
return(removed.ToArray());
}