string DebugCandidateInfo(List <SudokuCell> candidatePair)
{
List <int> values = candidatePair[0].Candidates.ToList();
int columnNumber = candidatePair[0].GridPosition.Column;
int rowNumber = candidatePair[0].GridPosition.Row;
int blockNumber = candidatePair[0].GridPosition.Block;
return(string.Format("Values: {0} Column: {1} Row: {2} Block: {3}",
StaticSudoku.ArrayToString(values, ", "),
columnNumber, rowNumber, blockNumber));
}
public override string ToString()
{ // Key = # of occurances, Value = List of numbers that occured that many times.
StringBuilder str = new StringBuilder();
foreach (var kvp in _dictionary)
{
str.AppendFormat("[{0}(key) occurrences of value(s): ({1})]", kvp.Key, StaticSudoku.ArrayToString <V>(kvp.Value, ","));
}
return(str.ToString());
}
int ExploreHiddenSubset(List <int> hiddenSubset, List <SudokuCell> block)
{
if (hiddenSubset.Count > 0)
{
DebugWrite("HiddenSubset: Candidate(s) ({0}) has only {1} entries in block {2}.",
StaticSudoku.ArrayToString(hiddenSubset, ", "), hiddenSubset.Count, block[0].Block);
List <SudokuCell> subsetCells = GetCellsWithSubset_Any(block, hiddenSubset);
if (subsetCells.Count == 0)
{
return(0);
}
if (subsetCells.Count == 1 && hiddenSubset.Count == 1)
{
SudokuCell cell = subsetCells[0];
int val = hiddenSubset[0];
DebugWrite("ELIMINATED NAKED Candidate \"{0}\": Block {1}, column {2}, row {3}.", val, cell.Block, cell.Column, cell.Row);
cell.Value = val;
return(RemoveCandidatesValues(hiddenSubset, _sudokuGrid.GetCellsInScope(cell).ToList()));
}
else if (subsetCells.Count == 2 && hiddenSubset.Count == 2)
{
int col = subsetCells[0].GridPosition.Column;
int row = subsetCells[0].GridPosition.Row;
bool columnMatch = InSameColumn(subsetCells);
bool rowMatch = InSameRow(subsetCells);
if (columnMatch)
{
// search columns
List <SudokuCell> scope = _sudokuGrid.GetColumnScope(col).Except(subsetCells).ToList();
DebugWrite("HIDDEN PAIR: Eliminated candidates ({0}) on column {1}.", StaticSudoku.ArrayToString(hiddenSubset, ","), col);
return(RemoveCandidatesValues(hiddenSubset, scope));
}
else if (rowMatch)
{
// search rows
List <SudokuCell> scope = _sudokuGrid.GetRowScope(row).Except(subsetCells).ToList();
DebugWrite("HIDDEN PAIR: Eliminated candidates ({0}) on row {1}.", StaticSudoku.ArrayToString(hiddenSubset, ","), row);
return(RemoveCandidatesValues(hiddenSubset, scope));
}
}
else if (subsetCells.Count == 3 && hiddenSubset.Count == 3)
{
bool columnMatch = InSameColumn(subsetCells);
bool rowMatch = InSameRow(subsetCells);
if (columnMatch)
{
int col = subsetCells[0].GridPosition.Column;
DebugWrite("_____HIDDEN TRIPLE: On column {0}", col);
}
else if (rowMatch)
{
int row = subsetCells[0].GridPosition.Row;
DebugWrite("_____HIDDEN TRIPLE: On row {0}", row);
}
}
}
return(0);
}
int FoundNakedMatchingCandidates(List <SudokuCell> matchingGroup, SudokuRegion region, int regionIndex)
{
List <int> groupValues = matchingGroup[0].Candidates.ToList();
DebugWrite("Found: Naked Matching Candidates! GroupSize=\"{0}\", Region=\"{1} {2}\", Candidates=\"{3}\".",
matchingGroup.Count, Enum.GetName(typeof(SudokuRegion), region), regionIndex, StaticSudoku.ArrayToString(groupValues, ","));
SudokuCell cell = matchingGroup[0];
foreach (SudokuCell seen in matchingGroup)
{
visitedGroups.Add(seen.GridPosition.ToString(), seen.FormatCandidatesString_Compact());
}
int totalEliminated = 0;
if (InSameRow(matchingGroup))
{
List <SudokuCell> rowScope = _sudokuGrid.GetRowScope(cell.Row).Except(matchingGroup).ToList();
totalEliminated += RemoveCandidatesValues(groupValues, rowScope);
}
else if (InSameColumn(matchingGroup))
{
List <SudokuCell> columnScope = _sudokuGrid.GetColumnScope(cell.Column).Except(matchingGroup).ToList();
totalEliminated += RemoveCandidatesValues(groupValues, columnScope);
}
if (InSameBlock(matchingGroup))
{
List <SudokuCell> blockScope = _sudokuGrid.GetBlockScope(cell.Block).Except(matchingGroup).ToList();
totalEliminated += RemoveCandidatesValues(groupValues, blockScope);
}
return(totalEliminated);
}