private int FilterDomain(SudokuVariable variable)
{
variable.ResetDomain();
int removedValues = 0;
foreach (SudokuVariable related in relatedFields[variable])
{
if (!related.IsEmpty())
{
bool removed = variable.Domain.Remove(related.Value);
if (removed)
{
removedValues++;
}
}
}
return(removedValues);
}
private void OrderDomain(SudokuVariable currElem)
{
int removedValues;
Dictionary <int, int> valuesRemovedByEachNumber = new Dictionary <int, int>();
foreach (int value in currElem.Domain)
{
removedValues = int.MaxValue;
currElem.Value = value;
if (CheckConstraints(currElem))
{
removedValues = FilterDomainsOfAllRelatedFields(currElem);
currElem.Value = 0;
ResetDomainsOfAllRelatedFields(currElem);
}
else
{
currElem.Value = 0;
}
valuesRemovedByEachNumber.Add(value, removedValues);
}
currElem.OrderedDomain = valuesRemovedByEachNumber.OrderBy(kv => kv.Value).Select(kv => kv.Key).ToList();
currElem.ResetDomain();
}