public List<int> ReturnPossibleValues(Column col, Row row, Quadrant quad)
{
List<int> possibleValues = new List<int>();
for(int i = 1; i <= 9; i++)
{
if(
!col.ContainsValue(i) &&
!row.ContainsValue(i) &&
!quad.ContainsValue(i))
possibleValues.Add(i);
}
return possibleValues;
}
public int[] SolveSquare(Square sq, Column col, Row row, Quadrant quad)
{
//This array is returned with the info as to whether the square was solved.
//It's values are:
//solveInfo[0] = -1 / 1 : indicates if the square was solved
//solveInfo[1] = int : indicates the solved value. 0 if it couldn't be solved.
int[] solveInfo = new int[2]{-1,0};
foreach(int number in sq.PossibleValues)
{
//Is this a possible value elsewhere in the quad? If not, then it's the correct value
if(!NumberIsPossibleElsewhereInQuad(number, quad))
{
solveInfo[0] = 1;
solveInfo[1] = number;
return solveInfo;
}
if(!NumberIsPossibleElsewhereInRow(number, row))
{
solveInfo[0] = 1;
solveInfo[1] = number;
return solveInfo;
}
if(!NumberIsPossibleElsewhereInCol(number, col))
{
solveInfo[0] = 1;
solveInfo[1] = number;
return solveInfo;
}
if(HasOnlyOnePossibleValue(sq)) {
solveInfo[0] = 1;
solveInfo[1] = number;
return solveInfo;
}
}
return solveInfo;
}
private bool NumberIsPossibleElsewhereInRow(int number, Row row)
{
bool existsElsewhere = false;
int numCount = 0;
foreach(Square sq in row.listOfSquares)
{
if(sq.PossibleValues.Contains(number))
numCount++;
}
if(numCount > 1)
existsElsewhere = true;
return existsElsewhere;
}