public NakedSinglesSolver(Puzzle puzzle)
{
_puzzle = puzzle;
}
public Solution SolveBox(int index)
{
var box = _puzzle.GetBox(index);
var solution = new Solution
{
Solved = false
};
var values = new bool[10];
var unsolvedCells = 0;
var unsolvedCell = 99;
for (int i = 0; i < 9; i++)
{
int value;
if (i < 3)
{
value = box.FirstRow[i];
}
else if (i < 6)
{
value = box.InsideRow[i - 3];
}
else
{
value = box.LastRow[i - 6];
}
if (value > 0)
{
values[value] = true;
}
else
{
unsolvedCells++;
unsolvedCell = i;
}
if (unsolvedCells > 1)
{
return(solution);
}
}
if (unsolvedCells == 0)
{
return(solution);
}
for (int i = 1; i < 10; i++)
{
if (!values[i])
{
solution.Value = i;
break;
}
}
(var row, var column) = Puzzle.GetLocationForBoxCell(index, unsolvedCell);
solution.Solved = true;
solution.Row = row;
solution.Column = column;
solution.Solver = this;
return(solution);
}