public SudokuGrid(int?[] grid)
{
if (grid.Count() != 9 * 9)
throw new ArgumentException();
_cells = new List<Cell>(9 * 9);
for (int y = 0; y < 9; y++)
{
for (int x = 0; x < 9; x++)
{
int? value = grid[y * 9 + x];
Cell cell = new Cell(this, value, x, y);
_cells.Add(cell);
}
}
}
int? investigateCell(Cell cell)
{
if (!cell.IsEmpty)
return cell.Value;
List<int> pValues = _grid.PossibleValues(cell);
if (pValues.Count == 1)
return (int?)pValues.First();
List<Cell> block = _grid.BlockOf(cell);
block.Remove(cell);
foreach (int value in pValues)
{
int otherPossibleCellsCount = block.Where(cell2 => _grid.PossibleValues(cell2).Contains(value)).Count();
if (otherPossibleCellsCount == 0)
return value;
}
return null;
}
public SudokuGrid(SudokuGrid grid)
{
if (grid == null)
throw new ArgumentNullException();
_cells = new List<Cell>(9 * 9);
for (int x = 0; x < 9; x++)
{
for (int y = 0; y < 9; y++)
{
Cell cell = new Cell(this, grid.Get(x, y).Value, x, y);
_cells.Add(cell);
}
}
}
public List<Cell> RowOf(Cell cell)
{
List<Cell> row = _cells.Where(cell2 => cell2.Y == cell.Y).ToList();
return row;
}
public List<int> PossibleValues(Cell cell)
{
if(!cell.IsEmpty)
return new List<int>(new int[]{(int)cell.Value});
List<Cell> column = ColumnOf(cell).Where(cell2 => !cell2.IsEmpty).ToList();
List<Cell> row = RowOf(cell).Where(cell2 => !cell2.IsEmpty).ToList();
List<Cell> block = BlockOf(cell).Where(cell2 => !cell2.IsEmpty).ToList();
List<int> fValues = new List<int>();
fValues.AddRange(column.ConvertAll(cell2 => (int)cell2.Value).ToList());
fValues.AddRange(row.ConvertAll(cell2 => (int)cell2.Value).ToList());
fValues.AddRange(block.ConvertAll(cell2 => (int)cell2.Value).ToList());
List<int> pValues = new List<int>();
for (int i = 1; i <= 9; i++)
{
if (fValues.Contains(i) == false)
pValues.Add(i);
}
return pValues;
}
public List<Cell> ColumnOf(Cell cell)
{
List<Cell> column = _cells.Where(cell2 => cell2.X == cell.X).ToList();
return column;
}
public bool? CantAccept(Cell cell, int value)
{
if(!PossibleValues(cell).Contains(value))
return true;
return null;
}
public List<Cell> BlockOf(Cell cell)
{
int blockX = cell.X - (cell.X % 3);
int blockY = cell.Y - (cell.Y % 3);
List<Cell> block =new List<Cell>();
for (int x = blockX; x < blockX + 3; x++)
{
for (int y = blockY; y < blockY + 3; y++)
{
block.Add(Get(x, y));
}
}
return block;
}