/* Solve methods */
// Solves a copy of the current board
private bool SolveBoard()
{
if (_solvedBoard != null)
return true;
// Copy the existing board and remove all non-predefined values
AbstractBoard _copyOfBoard = (AbstractBoard)_board.Clone();
_copyOfBoard.Clear();
// Solve the copied board and assign to solved board
Solver solver = new Solver(_copyOfBoard);
if (solver.SolveBoard())
{
_solvedBoard = _copyOfBoard;
return true;
}
else
throw new UnsolvableBoardException();
}
/// <summary>
/// Brute Force
/// </summary>
private bool BruteForce()
{
Coordinate CellsWithMinimumPossibleValues = null;
int minimumPossibleValues = int.MaxValue;
for (int i = 0; i != _board.GetBoardSize(); i++)
{
for (int j = 0; j != _board.GetBoardSize(); j++)
{
if ((possibleValues[i, j].Count < minimumPossibleValues) && (possibleValues[i, j].Count > 0))
{
minimumPossibleValues = possibleValues[i, j].Count;
CellsWithMinimumPossibleValues = new Coordinate(i, j);
}
}
}
if (CellsWithMinimumPossibleValues == null)
return false;
foreach (int possibleValue in possibleValues[CellsWithMinimumPossibleValues.Row, CellsWithMinimumPossibleValues.Column])
{
AbstractBoard copyOfBoard = (AbstractBoard)_board.Clone();
copyOfBoard.SetNumber(CellsWithMinimumPossibleValues.Row, CellsWithMinimumPossibleValues.Column, possibleValue);
Solver newSolver = new Solver(copyOfBoard);
if (newSolver.SolveBoard())
{
for (int i = 0; i != _board.GetBoardSize(); i++)
{
for (int j = 0; j != _board.GetBoardSize(); j++)
{
_board.SetNumber(i, j, copyOfBoard.GetNumber(i, j));
}
}
return true;
}
}
return false;
}