private bool IsValidSectionOfGrid(int[] grid, int index)
{
var positions = _positionCalculator.GetPosition(index);
var row = _sectionCutter.GetSingleRow(grid, positions[0]);
var column = _sectionCutter.GetSingleColumn(grid, positions[1]);
var square = _sectionCutter.GetSingleSquare(grid, positions[0], positions[1]);
return(!ContainsNoDuplicates(row) &&
!ContainsNoDuplicates(column) &&
!ContainsNoDuplicates(square));
}
private int[][] GetPossibleNumbersInGrid(int[] gridIntArray)
{
var possibilities = new int[81][];
int indexInGrid = 0;
var rawRows = _sectionCutter.GetAllRows(gridIntArray);
var allRows = rawRows.ToJaggedArray();
var allColumns = _sectionCutter.GetAllColumns(gridIntArray).ToJaggedArray();
var allSquares = _sectionCutter.GetAllSquares(gridIntArray).ToJaggedArray();
for (int i = 0; i < 81; i++)
{
var number = gridIntArray[i];
if (number == 0)
{
var possibleNumbers = Helper.ZeroToNineArray.AsEnumerable();
var position = _positionCalculator.GetPosition(indexInGrid);
var currentRow = allRows[position[0]];
var currentColumn = allColumns[position[1]];
var currentSquare = allSquares[position[2]];
var itemsToRemove = currentRow.Union(currentColumn).Union(currentSquare);
possibleNumbers = possibleNumbers.Except(itemsToRemove);
possibilities[i] = possibleNumbers.ToArray();
}
else
{
possibilities[i] = new int[1] {
gridIntArray[indexInGrid]
};
}
++indexInGrid;
}
return(possibilities);
}