private bool fillOnlyOneElement(Definition.GridLine gridLine)
{
//get empty element
Definition.Element emptyElement = null;
using (var e = gridLine.Elements
.Where(item => !item.HasValue)
.GetEnumerator())
{
if (!e.MoveNext())
{
return(true); //not empty element
}
emptyElement = e.Current;
if (e.MoveNext())
{
return(false); //more than one empty element
}
}
var lineType = gridLine.LineType;
//get two other grids
var currentGrid = gridLine.Grid;
Definition.Grid otherGrid1, otherGrid2;
currentGrid.GetOtherGrids(lineType, out otherGrid1, out otherGrid2);
int currentLineIndex = gridLine.Index;
var otherElementValues1 = otherGrid1.GetElementsInOtherGridLine(currentLineIndex, lineType)
.Values();
var otherElementValues2 = otherGrid2.GetElementsInOtherGridLine(currentLineIndex, lineType)
.Values();
var currentElementValues = currentGrid.Elements
.Values();
var exceptResult = otherElementValues1
.Concat(otherElementValues2)
.Except(currentElementValues);
if (!exceptResult.Any())
{
return(false); //no result
}
//get value which appeared both
var bothOtherElementValues = otherElementValues1.Intersect(otherElementValues2);
var exactIntersectElementValues = bothOtherElementValues.Intersect(exceptResult);
int value = exactIntersectElementValues.SingleOrDefault(-1);
if (value > 0)
{
filling(emptyElement, value);
emptyElement.SetValue(value);
return(true);
}
return(false);
}
private bool fillOnlyOneElement(IEnumerable <Definition.Element> elements)
{
if (elements == null)
{
throw new ArgumentNullException("elements");
}
//get empty element
Definition.Element emptyElement = null;
using (var e = elements
.Where(item => !item.HasValue)
.GetEnumerator())
{
if (!e.MoveNext())
{
return(true); //not empty element
}
emptyElement = e.Current;
if (e.MoveNext())
{
return(false); //more than one empty element
}
}
int value = 1;
foreach (int element in elements
.Where(item => item.HasValue)
.OrderBy(item => item))
{
if (element != value)
{
break;
}
value++;
}
filling(emptyElement, value);
emptyElement.SetValue(value);
return(true);
}
private bool fillAnyEmptyElement(Definition.Grid grid, Definition.Element emptyElement)
{
if (emptyElement.HasValue)
{
return(false);
}
//get two other grids in same row
Definition.Grid otherGridInRow1, otherGridInRow2;
grid.GetOtherGrids(Definition.LineType.Row, out otherGridInRow1, out otherGridInRow2);
//get two other grids in same column
Definition.Grid otherGridInColumn1, otherGridInColumn2;
grid.GetOtherGrids(Definition.LineType.Column, out otherGridInColumn1, out otherGridInColumn2);
int elementIndex = emptyElement.Index;
int rowLineIndex = elementIndex / 3;
int columnLineIndex = elementIndex % 3;
var otherGridInRow1Values = otherGridInRow1
.GetElementsInOtherGridLine(rowLineIndex, Definition.LineType.Row)
.Values();
var otherGridInRow2Values = otherGridInRow2
.GetElementsInOtherGridLine(rowLineIndex, Definition.LineType.Row)
.Values();
var otherGridInColumn1Values = otherGridInColumn1
.GetElementsInOtherGridLine(columnLineIndex, Definition.LineType.Column)
.Values();
var otherGridInColumn2Values = otherGridInColumn2
.GetElementsInOtherGridLine(columnLineIndex, Definition.LineType.Column)
.Values();
var currentElementValues = grid.Elements
.Values();
var exceptResult = otherGridInRow1Values
.Concat(otherGridInRow2Values)
.Concat(otherGridInColumn1Values)
.Concat(otherGridInColumn2Values)
.Except(currentElementValues);
if (!exceptResult.Any())
{
return(false); //no result
}
//get value which appeared both
var bothOtherElementValues = otherGridInRow1Values
.Intersect(otherGridInRow2Values)
.Intersect(otherGridInColumn1Values)
.Intersect(otherGridInColumn2Values);
var exactIntersectElementValues = bothOtherElementValues.Intersect(exceptResult);
int value = exactIntersectElementValues.SingleOrDefault(-1);
if (value > 0)
{
filling(emptyElement, value);
emptyElement.SetValue(value);
return(true);
}
return(false);
}
private bool fillOnlyOneElement(Definition.GridLine gridLine)
{
//get empty element
Definition.Element emptyElement = null;
using (var e = gridLine.Elements
.Where(item => !item.HasValue)
.GetEnumerator())
{
if (!e.MoveNext())
{
return(true); //not empty element
}
emptyElement = e.Current;
if (e.MoveNext())
{
return(false); //more than one empty element
}
}
var lineType = gridLine.LineType;
//get two other grids
var currentGrid = gridLine.Grid;
Definition.Grid otherGrid1, otherGrid2;
currentGrid.GetOtherGrids(lineType, out otherGrid1, out otherGrid2);
int currentLineIndex = gridLine.Index;
var grid1Completed = otherGrid1
.GetElementsInCurrentGridLine(currentLineIndex, lineType)
.AllHasValue();
var grid2Completed = otherGrid2
.GetElementsInCurrentGridLine(currentLineIndex, lineType)
.AllHasValue();
//only when one other grid line is completed
if (grid1Completed == grid2Completed)
{
return(false);
}
var targetGrid = grid1Completed ? otherGrid2 : otherGrid1;
//if one of seats value appeared in target grid, fill to complete
var seatValues = new LineEnumerable(this.sudoku, lineType)
//.ElementAt(currentLineIndex) //should get sudoku line index here
.ElementAt(getSudokuLineIndex(currentLineIndex, currentGrid.Index, lineType))
.Elements
.Values()
.SudokuExcept();
var intersectResults = targetGrid.Elements.Values()
.Except(currentGrid.Elements.Values())
.Intersect(seatValues);
int value = intersectResults.SingleOrDefault(-1);
if (value > 0)
{
filling(emptyElement, value);
emptyElement.SetValue(value);
return(true);
}
return(false);
}