private SudokuSolver GuessFork()
{
Point position = GetSmallestOptionPosition();
if (position.X < 0 || position.Y < 0)
{
return(null);
}
foreach (var opt in Data[position.X, position.Y].Notes)
{
SudokuSolver fork = SudokuSolver.Clone(this);
// Set the guess
fork.Data[position.X, position.Y].Value = opt;
// Try to solve
if (fork.Solve(true))
{
return(fork);
}
}
return(null);
}
public bool Solve(bool canFork = true)
{
int count;
do
{
count = GetOptionsCount();
foreach (Technique technique in Techniques)
{
technique.ReduceOptions();
FillValuesWithOneOption();
}
} while (count != GetOptionsCount());
if (Data.IsCorrect())
{
return(true);
}
if (IsInvalid())
{
return(false);
}
if (!canFork)
{
return(false);
}
SudokuSolver solution = GuessFork();
if (solution == null)
{
return(false);
}
this.Data = solution.Data;
return(true);
}
public static SudokuSolver Setup(Sudoku data)
{
SudokuSolver solver = new SudokuSolver(data);
for (int x = 0; x < Sudoku.BOARDSIZE; x++)
{
for (int y = 0; y < Sudoku.BOARDSIZE; y++)
{
if (solver.Data[x, y].HasValue)
{
solver.Data[x, y].Notes.Add(solver.Data[x, y]);
}
else
{
foreach (var note in DefaultOptions)
{
solver.Data[x, y].Notes.Add((byte)note);
}
}
}
}
return(solver);
}
public static SudokuSolver Clone(SudokuSolver subject)
{
return(new SudokuSolver(subject.Data.Clone()));
}
