private static List <Sudoku> IterSolver(Sudoku curr)
{
if (curr.Status == SolveStatus.Solved)
{
return new List <Sudoku> {
curr
}
}
;
var ret = new List <Sudoku>();
var coord = curr.NextUnsolved();
foreach (var item in curr.GetCandidate(coord.Item1, coord.Item2))
{
var tmp = new Sudoku(curr);
tmp[coord.Item1, coord.Item2] = item;
switch (tmp.Status)
{
case Sudoku.SolveStatus.Solved:
ret.Add(tmp);
break;
case Sudoku.SolveStatus.UnSolved:
ret.AddRange(IterSolver(tmp));
break;
case Sudoku.SolveStatus.NoSolution:
break;
default:
throw new ArgumentOutOfRangeException();
}
}
return(ret);
}