public override bool OnSolution()
{
foreach (Candidate c in SelectedCandidates)
{
if (c is BorderCandidate)
{
BorderCandidate bc = c as BorderCandidate;
colourOfCage[bc.ca1] = bc.co1;
colourOfCage[bc.ca2] = bc.co2;
}
}
haveSolution = true;
return(true);
}
public int[,] Solve(SudokuGrid grid, int[,] cages, int numCages)
{
int Cells = grid.Cells;
colourOfCage = new int[numCages];
nb = new Dictionary <int, List <int> >();
for (int ca = 0; ca < numCages; ++ca)
{
nb[ca] = new List <int>();
}
int[] dx = new int[] { -1, 0, 1, 0 };
int[] dy = new int[] { 0, -1, 0, 1 };
int numBorders = 0;
for (int x = 0; x < Cells; x++)
{
for (int y = 0; y < Cells; y++)
{
for (int d = 0; d < 4; ++d)
{
int x1 = x + dx[d];
int y1 = y + dy[d];
if (x1 >= 0 && x1 < Cells && y1 >= 0 && y1 < Cells)
{
int c1 = cages[x, y];
int c2 = cages[x1, y1];
if (c1 != c2)
{
List <int> ns = nb[c1];
if (!ns.Contains(c2))
{
ns.Add(c2);
++numBorders;
}
}
}
}
}
}
ColourRequirement[, ][] crs = new ColourRequirement[4, numCages][];
for (int co = 0; co < 4; ++co)
{
for (int ca = 0; ca < numCages; ca++)
{
int nn = nb[ca].Count;
ColourRequirement[] crs1 = new ColourRequirement[nn];
crs[co, ca] = crs1;
for (int n = 0; n < nn; ++n)
{
ColourRequirement cr = new ColourRequirement(co, ca, n);
crs1[n] = cr;
requirements.AddRequirement(cr);
}
}
}
for (int ca1 = 0; ca1 < numCages; ca1++)
{
for (int n1 = 0; n1 < nb[ca1].Count; ++n1)
{
for (int co1 = 0; co1 < 4; ++co1)
{
for (int co2 = 0; co2 < 4; ++co2)
{
if (co1 != co2)
{
int ca2 = nb[ca1][n1];
if (ca1 < ca2)
{
int n2 = findNeighbour(ca2, ca1);
BorderCandidate bc = new BorderCandidate(co1, ca1, co2, ca2);
bc.AddCandidate(crs[co1, ca1][n1]);
bc.AddCandidate(crs[co2, ca2][n2]);
}
}
}
}
}
}
for (int co1 = 0; co1 < 4; ++co1)
{
for (int ca = 0; ca < numCages; ca++)
{
RegionCandidate rc = new RegionCandidate(ca, co1);
for (int co2 = 0; co2 < 4; ++co2)
{
if (co2 != co1)
{
for (int n = 0; n < nb[ca].Count; ++n)
{
rc.AddCandidate(crs[co2, ca][n]);
}
}
}
}
}
CreateSolution(numCages + numBorders / 2);
BacktrackingSearch();
if (!haveSolution)
{
return(null);
}
int[,] ret = new int[Cells, Cells];
for (int x = 0; x < Cells; x++)
{
for (int y = 0; y < Cells; y++)
{
ret[x, y] = colourOfCage[cages[x, y]];
}
}
return(ret);
}
