public SolutionInfo CheckAllCellsForSolvability()
{
List <OpenCell> copyOfUnsolvedCellList = data.GetCopyOfUnsolvedCells();
SolutionInfo overallSolutionInfo = new SolutionInfo();
foreach (OpenCell cell in copyOfUnsolvedCellList)
{
SolutionInfo cellSolutionInfo = cell.UpdateValueList(false);
overallSolutionInfo.CombineWith(cellSolutionInfo);
if (!overallSolutionInfo.solvable)
{
return(overallSolutionInfo);
}
overallSolutionInfo.CombineWith(CheckCellValuesForViability(cell));
//if (cell.OnlyOneSolution())
// SetCellToSolved(cell);
}
return(overallSolutionInfo);
}
private UpdateResult SolvePuzzle()
{
UpdateResult updateResult = UpdateResult.unchanged;
debugLog.Write("SolvePuzzle()\n");
bool movedCloserToSolution = true;
try
{
while (movedCloserToSolution)
{
movedCloserToSolution = false;
// SyncAllOpenCells();
foreach (CellGroup cellGroup in cellGroupsWithSums)
{
SolutionInfo result = cellGroup.Solve();
if (!result.solvable)
{
if (cellGroupsWithSums.Count == 0)
{
debugLog.Write("No more cell groups with sums left!\n");
}
throw (new IllegalSumException2("Solve attempt failed. Group: " + cellGroup.ToString()));
}
if (result.MovedCloserToSolution())
{
movedCloserToSolution = true;
updateResult = UpdateResult.changed;
}
}
}
}
catch (types.IllegalSumException2 exception)
{
debugLog.Write(">>>>>>>>>>>> Caught an unsolvable exception, after the group set a sum.\n");
debugLog.Write(" The error is: " + exception.Message);
updateResult = RewindLastSummedGroup();
}
MoveSolvedGroups();
return(updateResult);
}
/***************************************************************************
* UpdateValueList()
* tests the list of solutions, and removes the ones that do not work.
* returns the increase in solutions (i.e. a negative number is good.)
**************************************************************************/
public SolutionInfo UpdateValueList(bool debugStatementsOn)
{
if (debugStatementsOn)
{
debugLog.Write("Starting to UpdateValueList cellToTry (" + ToString() + "->");
}
SolutionInfo returnInfo = new SolutionInfo();
int initialNumOfSolutions = cellSolutionInfo.NumberOfPossibleDigits();
returnInfo.CombineWith(MergeValueListWithParentGroups());
int updatedNumberOfSolutions = cellSolutionInfo.NumberOfPossibleDigits();
returnInfo.increaseInNumber = updatedNumberOfSolutions - initialNumOfSolutions;
if (debugStatementsOn)
{
debugLog.Write(ToString() + ")\n");
}
return(returnInfo);
}