private Result EliminateValuesSingle(int value)
{
Result result = Result.NoChange;
//Iterate over column and find if this value is present only in one cell then set value for that cell.
Cell uniqueCell = null;
for (int x = 0, y = Y; x < Size; x++)
{
Cell currCell = AllCells[x][y];
if (currCell.PossibleValues.Contains(value))
{
if (uniqueCell != null)
{
uniqueCell = null;
break;
}
uniqueCell = currCell;
}
}
if (uniqueCell != null)
{
result = uniqueCell.SetCellValue(value);
}
if (result == Result.Failed)
{
return(Result.Failed);
}
//Iterate over rows
uniqueCell = null;
for (int x = X, y = 0; y < Size; y++)
{
Cell currCell = AllCells[x][y];
if (currCell.PossibleValues.Contains(value))
{
if (uniqueCell != null)
{
uniqueCell = null;
break;
}
uniqueCell = currCell;
}
}
if (uniqueCell != null)
{
result = uniqueCell.SetCellValue(value);
}
return(result);
}
private static Result ApplySimpleRules(Lane lane)
{
int clue = lane.Clue;
int size = lane.Cells.Count;
if (clue == 0)
{
return(Result.NoChange);
}
Result result = Result.NoChange;
if (clue == 1)
{
return(lane.Cells[0].SetCellValue(lane.Cells[0].PossibleValues.Max()));
}
if (clue == size)
{
for (int i = 0; i < size; i++)
{
Cell cell = lane.Cells.ElementAtOrDefault(i);
if (cell != null)
{
result = cell.SetCellValue(cell.PossibleValues.Min()) | result;
if (Result.Failed == (result & Result.Failed))
{
return(Result.Failed);
}
}
}
return(result);
}
List <int> possibleValuesInLane = lane.Cells.SelectMany(c => c.PossibleValues).Distinct().ToList();
if (possibleValuesInLane.Count != size)
{
return(Result.Failed);
}
possibleValuesInLane.Sort();
if (clue == 2 && size > 1)
{
result = lane.Cells[1].RemoveValue(possibleValuesInLane[size - 2]);
if (Result.Failed == result)
{
return(Result.Failed);
}
}
for (int indexToBeRemoved = size; indexToBeRemoved > size - clue + 1; indexToBeRemoved--)
{
for (int i = 0; i < clue + indexToBeRemoved - size - 1; i++)
{
Cell cell = lane.Cells.ElementAtOrDefault(i);
if (cell != null)
{
int cellCount = lane.Cells.Count;
result = cell.RemoveValue(possibleValuesInLane[indexToBeRemoved - 1]) | result;
if (Result.Failed == (result & Result.Failed))
{
return(Result.Failed);
}
if (cellCount != lane.Cells.Count)
{
return(result);
}
}
}
}
return(result);
}