public static bool Filler(ref Panel pl)
{
bool changed = false;
//check blocks
for (int y = 0; y < 9; y++)
{
for (int x = 0; x < 9; x++)
{
if (pl[x, y].Number == SudoNum.Unknown && pl[x, y].CandidateNumber.Count == 1)
{
SudoNum tmp = pl[x, y].CandidateNumber.GetNumbers()[0];
pl[x, y].Number = tmp;
RowExpel(ref pl, y, x, tmp);
ColumnExpel(ref pl, x, y, tmp);
RegionExpel(ref pl, Panel.GetRegion(x, y), Panel.GetRegionNumber(x, y), tmp);
changed = true;
}
}
}
//check regions
for (int r = 0; r < 9; r++)
{
int[] counter = new int[10];
for (int n = 0; n < 9; n++)
{
if (pl[Panel.GetX(r, n), Panel.GetY(r, n)].Number != SudoNum.Unknown)
{
continue;
}
foreach (SudoNum item in pl[Panel.GetX(r, n), Panel.GetY(r, n)].CandidateNumber.GetNumbers())
{
counter[(int)item]++;
}
}
for (int i = 1; i < 10; i++)
{
if (counter[i] == 1)
{
for (int n = 0; n < 9; n++)
{
if (pl[Panel.GetX(r, n), Panel.GetY(r, n)].CandidateNumber.HasNumber((SudoNum)i))
{
pl[Panel.GetX(r, n), Panel.GetY(r, n)].Number = (SudoNum)i;
RowExpel(ref pl, Panel.GetY(r, n), Panel.GetX(r, n), (SudoNum)i);
ColumnExpel(ref pl, Panel.GetX(r, n), Panel.GetY(r, n), (SudoNum)i);
changed = true;
}
}
}
}
}
return(changed);
}
public static void RegionExpel(ref Panel pl, int region, int except, SudoNum value)
{
for (int i = 0; i < 9; i++)
{
if (i == except)
{
continue;
}
pl[Panel.GetX(region, i), Panel.GetY(region, i)].CandidateNumber.Remove(value);
}
}