/// <summary>
/// Checks whether a sudoku board is valid or not based on repetition of values in a column, row or box
/// </summary>
/// <param name="board">Sudoku board to be tested for solution</param>
/// <returns>True if input board is valid</returns>
public static bool IsBoardValid(SudokoBoard board)
{
if (board.Rows.Any(lst => lst.Count(x => x != 0) != lst.Where(x => x != 0).Distinct().Count()))
{
return(false);
}
if (board.Columns.Any(lst => lst.Count(x => x != 0) != lst.Where(x => x != 0).Distinct().Count()))
{
return(false);
}
var boxValuesList = board.GetBoxValuesList();
if (boxValuesList.Any(lst => lst.Count(x => x != 0) != lst.Where(x => x != 0).Distinct().Count()))
{
return(false);
}
return(true);
}
/// <summary>
/// Checks whether a sudoku board is solved or not based on column, row or box sums
/// </summary>
/// <param name="board">Sudoku board to be tested for solution</param>
/// <returns>True if input board is solved</returns>
public static bool IsBoardSolved(SudokoBoard board)
{
if (board.Rows.Any(row => row.GetDistinctSum() != 45))
{
return(false);
}
else if (board.Columns.Any(col => col.GetDistinctSum() != 45))
{
return(false);
}
else
{
var lists = board.GetBoxValuesList();
if (lists.Any(list => list.GetDistinctSum() != 45))
{
return(false);
}
}
return(true);
}
