static SudokuPuzzle ClearPossiblesForACell(int i, int j, SudokuPuzzle puzzle)
{
// 读取一个值，如果此值为0，则继续下一个
int currVal = puzzle.Item[i][j].Val;
if (currVal == 0)
{
return(puzzle);
}
// 清除根据此值可以排除的值
// 清除同行的值
int row = i;
int col = 0;
for (col = 0; col < 9; col++)
{
if (col == j)
{
continue;
}
SudokuItem tempItem = puzzle.Item[row][col];
if (tempItem.Val == currVal)
{
throw new Exception("同一行有相同值");
}
if (tempItem.IsConfirmed)
{
continue;
}
tempItem.RemoviePossibleVal(currVal);
}
// 清除同列的值
col = j;
for (row = 0; row < 9; row++)
{
if (row == i)
{
continue;
}
SudokuItem tempItem = puzzle.Item[row][col];
if (tempItem.Val == currVal)
{
throw new Exception("同一列有相同值");
}
if (tempItem.IsConfirmed)
{
continue;
}
tempItem.RemoviePossibleVal(currVal);
}
// 清除同块的值
col = j / 3;
row = i / 3;
int rowTml = (row + 1) * 3;
int colTml = (col + 1) * 3;
for (int tr = row * 3; tr < rowTml; tr++)
{
for (int tc = col * 3; tc < colTml; tc++)
{
if (tr == i && tc == j)
{
continue;
}
SudokuItem tempItem = puzzle.Item[tr][tc];
if (tempItem.Val == currVal)
{
throw new Exception("同一框有相同值");
}
if (tempItem.IsConfirmed)
{
continue;
}
tempItem.RemoviePossibleVal(currVal);
}
}
return(puzzle);
}
