public static bool IsPuzzleValid(SudokuPuzzle puzzle)
{
int sum(SudokuPiece[,] p)
{
int result = 0;
for (int i = 0; i < 3; ++i)
{
for (int k = 0; k < 3; ++k)
{
result += p[i, k].Value;
}
}
return(result);
}
for (int i = 0; i < 9; ++i)
{
if (puzzle.GetRow(i).Sum(x => x.Value) != 45 || puzzle.GetColumn(i).Sum(x => x.Value) != 45 || sum(puzzle.GetArea(i)) != 45)
{
return(false);
}
}
return(true);
}