private static GridSolutionType CheckDoubleDeduction(GridSquareScript[] gridSquares, GridSquareScript selection)
{
int[] intersectIndices = GridEmptyIntersectIndices(gridSquares, selection);
int[] missingRows = intersectIndices.Select(GridMaths.RowForSquare).Where(x => x != GridMaths.RowForSquare(selection.Index)).Distinct().ToArray();
int[] missingCols = intersectIndices.Select(GridMaths.ColumnForSquare).Where(x => x != GridMaths.ColumnForSquare(selection.Index)).Distinct().ToArray();
print($"Intersect indices: {string.Join(", ", intersectIndices)} Missing rows: {string.Join(", ", missingRows)} cols: {string.Join(", ", missingCols)}");
int forceRowCount = 0;
int big = GridMaths.BigSquareForSquare(selection.Index);
for (int i = 0; i < missingRows.Length; i++)
{
int[] otherBigRows = GridMaths.OtherBigSquaresForRow(missingRows[i], big);
for (int j = 0; j < otherBigRows.Length; j++)
{
if (DoesSquareForceRowNumber(otherBigRows[j], selection, missingRows[i], gridSquares))
{
forceRowCount += 1;
}
}
}
int forceColCount = 0;
for (int i = 0; i < missingCols.Length; i++)
{
int[] otherBigCols = GridMaths.OtherBigSquaresForColumn(missingCols[i], big);
for (int j = 0; j < otherBigCols.Length; j++)
{
if (DoesSquareForceColumnNumber(otherBigCols[j], selection, missingCols[i], gridSquares))
{
forceColCount += 1;
}
}
}
print($"[CHECK] Double deduction: Forced rows: {missingRows.Length} = {forceRowCount} && cols: {missingCols.Length} = {forceColCount} check: {forceColCount == missingCols.Length && forceRowCount == missingRows.Length}");
return((forceColCount == missingCols.Length && forceRowCount == missingRows.Length) ? GridSolutionType.DoubleDeduction : GridSolutionType.None);
}