public SolutionInfo Solve()
{
SolutionInfo result = new SolutionInfo();
if (!SumIsKnown())
{
return(result);
}
List <OpenCell> copyOfUnsolvedCellList = data.GetCopyOfUnsolvedCells();
foreach (OpenCell unsolvedCell in copyOfUnsolvedCellList)
{
SolutionInfo cellsSolutionInfo = unsolvedCell.UpdateValueList(false);
if (!cellsSolutionInfo.solvable)
{
return(cellsSolutionInfo);
}
cellsSolutionInfo.CombineWith(CheckCellValuesForViability(unsolvedCell));
// debugLog.Write(cell.AllPossibleValues());
if (unsolvedCell.OnlyOneSolution())
{
FinalizeBothParents(unsolvedCell);
}
result.CombineWith(cellsSolutionInfo);
}
SolutionInfo newResult = result;
while (newResult.MovedCloserToSolution())
{
newResult = Solve();
result.CombineWith(newResult);
}
return(result);
}
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);
}
/***************************************************************************
* 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);
}
