public static int[,] Create(SudokuBoard.BoardProperty boardProperty = SudokuBoard.BoardProperty.NineByNine)
{
Random random = new Random();
SudokuBoard solution = new SudokuBoard(boardProperty);
solution.SetField();
solution = Solve(solution);
int[,] sudoku = solution.GetAsMultidimentionalArray();
List <int[]> fields = new List <int[]>();
for (int x = 0; x < sudoku.GetLength(0); x++)
{
for (int y = 0; y < sudoku.GetLength(0); y++)
{
fields.Add(new int[] { x, y });
}
}
while (fields.Count() != 0)
{
int[,] newSudokuAttempt = CreateCopyOfArray(sudoku);
int[] randomField = fields[random.Next(fields.Count())];
newSudokuAttempt[randomField[0], randomField[1]] = 0;
solution.SetField(newSudokuAttempt);
solution = Solve(solution, false);
if (solution.Finished)
{
sudoku = newSudokuAttempt;
}
fields.Remove(randomField);
}
return(sudoku);
}
private static SudokuBoard Solve(SudokuBoard board, bool willGuess = true)
{
int solveState = 1;
while (true)
{
switch (solveState)
{
case 0:
if (board.Changed == true)
{
if (board.Finished == true)
{
if (board.Guess == true)
{
if (board.SimpleTest() == false)
{
goto case 7;
}
}
return(board);
}
board.Changed = false;
board.ChangedExcluding = false;
if (solveState == 1)
{
solveState++;
}
else
{
solveState = 1;
}
break;
}
else if (solveState > 3 && board.ChangedExcluding == true)
{
if (solveState == 4)
{
board.ChangedExcluding = false;
solveState++;
}
else
{
solveState = 4;
}
break;
}
else
{
solveState++;
break;
}
case 1:
board.SimpleHorisontalExclusion();
goto case 0;
case 2:
board.SimpleVerticalExclusion();
goto case 0;
case 3:
board.SimpleSquareExclusion();
goto case 0;
case 4:
board.ChangedExcluding = false;
board.HorizontalExclusionOnOnlyPositionsThatFit();
goto case 0;
case 5:
board.VerticalExclusionOnOnlyPositionsThatFit();
goto case 0;
case 6:
board.SquareExclusionOnOnlyPositionsThatFit();
goto case 0;
case 7:
if (willGuess)
{
board.MakeGuess();
goto case 0;
}
else
{
goto case 8;
}
case 8:
return(board);
}
}
}