/// <summary> <!-- {{{1 --> Get cells from house index
/// </summary>
/// <param name="idx"></param>
/// <returns></returns>
public IEnumerable <Cell> CellsFromHouse(SudokuHouseIndex idx)
{
idx.AssertWhenInvalid();
return(CellsFromRow(idx)
.Concat(CellsFromCol(idx))
.Concat(CellsFromBox(idx)));
}
/// <summary> <!-- {{{1 --> Get cells from box index
/// </summary>
/// <param name="idx"></param>
/// <returns></returns>
public IEnumerable <Cell> CellsFromBox(SudokuHouseIndex idx)
{
idx.AssertWhenInvalid();
return(idx.ToCellsIndexInBox().Select(x => this.board.ElementAt(x.ToInt())));
}
