规则Rules：
填入1~4，使得每行、列、宫内数字不重复（宫可能是不规则的）。此外，每行、列、宫中都应该有一颗星（用0代替），并且星星之间不能彼此接触。
Write 1~4, make numbers no repeated in each Row, Column and Box (the Box may be irregular). Additionally, each Row, Column or Box contains a star (use 0 to instead), and stars cannot be horizontally, vertically or diagonally adjacent.
