数独的解法程序，利用了递归算法，在不能确定数的情况下，假设数，继续进行算法，直到所有可能性排除返回，以排除假设的数。-The the Sudoku Solution program, the use of a recursive algorithm, the case can not determine the number of assumptions, and proceed with the algorithm, until all excluded the possibility of return, so as to exclude a number of assumptions.