/// <inheritdoc/>
public bool TryInit(IReadOnlyPuzzleWithMutablePossibleValues puzzle)
{
foreach (IRule r in _rules)
{
if (!r.TryInit(puzzle, puzzle.UniquePossibleValues))
{
return(false);
}
}
foreach (Coordinate c in puzzle.GetUnsetCoords())
{
foreach (IRule r in _rules)
{
puzzle.IntersectPossibleValues(in c, r.GetPossibleValues(in c));
}
if (puzzle.GetPossibleValues(in c).IsEmpty)
{
return(false);
}
}
if (_coordTracker is null || _coordTracker.Size != puzzle.Size)
{
_coordTracker = new CoordinateTracker(puzzle.Size);
}
_puzzle = puzzle;
return(true);
}
/// <inheritdoc/>
public bool TryInit(IReadOnlyPuzzleWithMutablePossibleValues puzzle)
{
int size = puzzle.Size;
_puzzle = puzzle;
_boxSize = Boxes.IntSquareRoot(puzzle.Size);
_unsetRowValues = new BitVector[size];
_unsetRowValues.AsSpan().Fill(_puzzle.UniquePossibleValues);
Span <BitVector> possibleValues = _unsetRowValues.AsSpan();
_unsetColumnValues = possibleValues.ToArray();
_unsetBoxValues = possibleValues.ToArray();
int boxIdx;
for (int row = 0; row < size; row++)
{
for (int col = 0; col < size; col++)
{
boxIdx = Boxes.CalculateBoxIndex(new Coordinate(row, col), _boxSize);
int?val = puzzle[row, col];
if (!val.HasValue)
{
continue;
}
if (!_unsetRowValues[row].IsBitSet(val.Value) ||
!_unsetColumnValues[col].IsBitSet(val.Value) ||
!_unsetBoxValues[boxIdx].IsBitSet(val.Value))
{
return(false);
}
_unsetRowValues[row].UnsetBit(val.Value);
_unsetColumnValues[col].UnsetBit(val.Value);
_unsetBoxValues[boxIdx].UnsetBit(val.Value);
}
}
foreach (Coordinate c in puzzle.GetUnsetCoords())
{
_puzzle.IntersectPossibleValues(in c, _GetPossibleValues(in c));
if (_puzzle.GetPossibleValues(in c).IsEmpty)
{
return(false);
}
}
return(true);
}
