/// <summary>
/// Creates solved state to the game board and returns whether the puzzle solved.
/// </summary>
/// <param name="UseRandomGenerator">Set it to true to see a different result for each solution.</param>
/// <returns>Returns whether the board solved.</returns>
public bool SolveThePuzzle(bool UseRandomGenerator = true)
{
// Return false if the current state is board is not valid.
if (!CheckTableStateIsValid())
{
return(false);
}
// Init protected index list to protect the current state of the board while backtracking.
InitIndexListOfTheAlreadyFilledCells();
// Clear the blacklist
ClearBlackList();
int currentCellIndex = 0;
// Iterate all the cells of the board.
while (currentCellIndex < SudokuBoard.TOTAL_CELLS)
{
// If the current cell index is protected(which means it was inner the current state of the board), pass it.
if (TheIndexesOfFilledCells.Contains(currentCellIndex))
{
++currentCellIndex;
continue;
}
// Clear blacklists of the indexes after the current index.
ClearBlackList(startCleaningFromThisIndex: currentCellIndex + 1);
Cell currentCell = SudokuBoard.GetCell(cellIndex: currentCellIndex);
int theFoundValidNumber = GetValidNumberForTheCell(currentCellIndex, UseRandomGenerator);
// No valid number found for the cell. Let's backtrack.
if (theFoundValidNumber == 0)
{
// Let's backtrack
currentCellIndex = BacktrackTo(currentCellIndex);
}
else
{
// Set found valid value to current cell.
SudokuBoard.SetCellValue(theFoundValidNumber, currentCell.Index);
++currentCellIndex;
}
}
return(true);
}