public int[] GetValidNumbers(Square square)
{
return GetValidNumbers(square.Row, square.Column);
}
public bool IsValidMove(int row, int col, int number, out Square[] invalidSquares)
{
HashSet<Square> temp = new HashSet<Square>();
/* I set temporary the square value to 0, so I won't have a match when the ifs below test the square
* against itself. I'll restore the value before I return from the method */
_grid[row, col].Value = 0;
// I check if in the given row and column I have the given number
for (int i = 0; i < Columns; i++)
{
if (_grid[row, i].Value == number)
{
temp.Add(_grid[row, i]);
}
else if (_grid[i, col].Value == number)
{
temp.Add(_grid[i, col]);
}
}
// Since I have previously saved the row and column where every box starts, it's easy to check the 9 squares of the box
int boxIndex = GetBoxIndex(row, col);
int boxStartingRow = Boxes[boxIndex].Item1;
int boxStartingColumn = Boxes[boxIndex].Item2;
for (int i = boxStartingRow; i < boxStartingRow + 3; i++)
{
for (int j = boxStartingColumn; j < boxStartingColumn + 3; j++)
{
if (_grid[i, j].Value == number)
{
temp.Add(_grid[i, j]);
}
}
}
_grid[row, col].Value = number;
invalidSquares = temp.ToArray();
return invalidSquares.Length == 0;
}
private void PopulateSudokuGrid(string sudoku)
{
_fixedNumbersPosition = new List<int>();
int i = 0;
for (int row = 0; row < Rows; row++)
{
for (int col = 0; col < Columns; col++)
{
_grid[row, col] = new Square()
{
Type = SquareType.Empty,
Row = row,
Column = col,
Value = sudoku[i] == '.' ? 0 : int.Parse(sudoku[i].ToString())
};
if (_grid[row, col].Value != 0)
{
_grid[row, col].Type = SquareType.FixedNumber;
_fixedNumbersPosition.Add(row * Columns + col);
}
i++;
}
}
}
public bool IsValidMove(Square square)
{
Square[] invalidSquares;
return IsValidMove(square.Row, square.Column, square.Value, out invalidSquares);
}