public static void EliminateDuplicates(SudokuModel model, int col, int row)
{
if (model.IsSolved(col, row)) {
var value = model.GetValue(col, row);
foreach (var region in model.GetIntersectingRegions(col, row)) {
foreach (var other in model.GetCells(region.Type, region.I)) {
if (other.Column != col || other.Row != row) {
model.Eliminate(other.Column, other.Row, value);
}
}
}
}
}
bool OperateOn(int col, int row, SudokuModel model)
{
if (!model.IsSolved(col, row)) {
// obviously can't eliminate anything in a solved cell.
// try each int i that is a possibility for the cell, and see if an error results
foreach (var i in model.GetPossibilitySetCell(col, row).HighBitPositions()) {
var clone = new SudokuModel(model);
clone.SetValue(col, row, i);
_elimStrategy.Run(clone);
if (clone.IsConsistent()) {
continue;
}
// If so, we can eliminate that from the original model.
model.Eliminate(col, row, i);
return true;
// return immediately after eliminating something, since
// this is a slow algorithm, and we want our faster
// algorithms to see if they make some more eliminations first.
}
}
return false;
}