private void SolveForQuadrants()
{
for (int i = 0; i < QUADS; i++)
{
int[] PossibleAnswerArray = new int[NUM_VALS];
int[] PossibleCellArray = new int[NUM_VALS];
int StartOfQuadrantIndex = (i % QUAD_ROWS) * QUAD_ROWS + (i / QUAD_ROWS) * CELLS_PER_THREE_QUADS;
for (int j = 0; j < QUAD_CELLS; j++)
{
int idx = StartOfQuadrantIndex + j % QUAD_COLS + (int)Math.Floor((double)(j / QUAD_COLS)) * COLS;
if (_Cells.TryGetValue(idx, out CellHashset Cell))
{
if (!Cell.IsAnswered())
{
foreach (int answer in Cell.PossibleAnswers)
{
PossibleAnswerArray[answer - 1]++;
PossibleCellArray[answer - 1] = idx;
}
}
else
{
PossibleAnswerArray[Cell.Answer - 1] = 2;
}
}
}
// value is -1 from the actual value
for (int value = 0; value < NUM_VALS; value++)
{
// if the PossibleAnswerArray holds a 1, only 1 cell can have that value so it's the answer
if (PossibleAnswerArray[value] == 1)
{
SetCellAnswer(PossibleCellArray[value], value + 1);
}
}
}
}
private void SolveForRows()
{
for (int i = 0; i < ROWS; i++)
{
int[] PossibleAnswerArray = new int[NUM_VALS];
int[] PossibleCellArray = new int[NUM_VALS];
for (int j = i * COLS; j < (i + 1) * COLS; j++)
{
if (_Cells.TryGetValue(j, out CellHashset Cell))
{
if (!Cell.IsAnswered())
{
foreach (int answer in Cell.PossibleAnswers)
{
PossibleAnswerArray[answer - 1]++;
PossibleCellArray[answer - 1] = j;
}
}
else
{
PossibleAnswerArray[Cell.Answer - 1] = 2;
}
}
}
// value is -1 from the actual value
for (int value = 0; value < NUM_VALS; value++)
{
// if the PossibleAnswerArray holds a 1, only 1 cell can have that value so it's the answer
if (PossibleAnswerArray[value] == 1)
{
SetCellAnswer(PossibleCellArray[value], value + 1);
}
}
}
}