public bool AppliesAt(int x, int y, SudokuGrid grid)
{
if (house == Houses.Cell)
{
return(x == i0 && y == i1);
}
if (house == Houses.Column)
{
return(x == i0);
}
if (house == Houses.Row)
{
return(y == i0);
}
if (house == Houses.Box)
{
return(grid.BoxAt(x, y) == i0);
}
if (house == Houses.MajorDiagonal)
{
return(x == y);
}
if (house == Houses.MinorDiagonal)
{
return(x == grid.Cells - y - 1);
}
if (house == Houses.Cage)
{
return(grid.CageAt(x, y) == i0);
}
return(false);
}
/*
* public SudokuSolver(string[] lines)
* {
* CreateMatrix();
* Apply(lines);
* }
*/
void CreateMatrix(SudokuGrid grid)
{
// Create requirements - columns of 0/1 matrix
int num_cages = grid.NumCages;
int diags = 0;
if (grid.MajorDiagonal)
{
++diags;
}
if (grid.MinorDiagonal)
{
++diags;
}
int d = grid.MajorDiagonal ? 1 : 0; // Where minor diagonal is found
CreateRequirements(grid, Cells * Cells * 4 + diags * Cells);
CreateOptionals(grid, num_cages);
Houses[] houses = new Houses[] {
Houses.Cell,
Houses.Column,
Houses.Row,
Houses.Box
};
for (int i0 = 0; i0 < Cells; ++i0)
{
for (int i1 = 0; i1 < Cells; ++i1)
{
for (int type = 0; type < 4; ++type)
{
Houses house = houses[type];
SudokuRequirement c = GetRequirement(i0, i1, house);
c.i0 = i0;
c.i1 = i1;
c.house = house;
requirements.AddRequirement(c);
}
}
}
if (grid.MajorDiagonal)
{
for (int i0 = 0; i0 < Cells; ++i0)
{
SudokuRequirement c = GetDiagonalRequirement(0, i0);
c.i0 = i0;
c.i1 = -1;
c.house = Houses.MajorDiagonal;
requirements.AddRequirement(c);
}
}
if (grid.MinorDiagonal)
{
for (int i0 = 0; i0 < Cells; ++i0)
{
SudokuRequirement c = GetDiagonalRequirement(d, i0);
c.i0 = i0;
c.i1 = -1;
c.house = Houses.MinorDiagonal;
requirements.AddRequirement(c);
}
}
for (int i0 = 0; i0 < num_cages; ++i0)
{
for (int i1 = 0; i1 < Cells; ++i1)
{
CageOptional ca = GetCageOptional(i0, i1);
ca.i0 = i0;
ca.i1 = i1;
ca.house = Houses.Cage;
//optionals.AddRequirement(ca);
ca.SetIncluded();
}
}
// Create candidates - rows of 0/1 matrix
CreateCandidates(new SudokuCandidate[Cells * Cells * Cells]);
CreateSolution(Cells * Cells);
for (int x = 0; x < Cells; ++x)
{
for (int y = 0; y < Cells; ++y)
{
int cage = grid.CageAt(x, y);
int box = grid.BoxAt(x, y);
for (int n = 0; n < Cells; ++n)
{
SudokuCandidate k = new SudokuCandidate(x, y, n, box, cage);
k.AddCandidate(GetRequirement(x, y, Houses.Cell));
k.AddCandidate(GetRequirement(x, n, Houses.Column));
k.AddCandidate(GetRequirement(y, n, Houses.Row));
k.AddCandidate(GetRequirement(box, n, Houses.Box));
if (grid.MajorDiagonal && x == y)
{
k.AddCandidate(GetDiagonalRequirement(0, n));
}
if (grid.MinorDiagonal && x == Cells - y - 1)
{
k.AddCandidate(GetDiagonalRequirement(d, n));
}
if (cage != -1)
{
k.AddCageOptional(GetCageOptional(cage, n));
}
tr[trc++] = k;
// Discard candidates where cage size already reached 1
//if (cage != -1 && grid.cageInfo.sizes[cage] == 1 && n + 1 != grid.cageInfo.totals[cage])
// DiscardCandidate(k);
}
}
}
// Discard candidates that do not meet cage total
for (int i0 = 0; i0 < num_cages; ++i0)
{
CageOptional.CheckRemains(this, grid.cageInfo, i0, -1);
}
/*
* if (grid.IsKiller)
* {
* SudokuGrid.CageInfo info = grid.cageInfo;
* for (int ca = 0; ca < info.cages.Length; ++ca)
* {
* List<Point> pts = new List<Point>();
* for (int x = 0; x < Cells; ++x)
* for (int y = 0; y < Cells-1; ++y)
* if (info.cages[x, y] == ca)
* pts.Add(new Point(x, y));
* int[] ns = new int[Cells];
* for (int i = 0; i < Cells; ++i) ns[i] = i;
* Candidate k = new Candidate();
* KillerRequire(k, info.totals[ca], pts.ToArray(), ns);
* }
* }
*/
}