规则Rules：
填入1~5，使得每行、列、宫内数字不重复。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。箭头所在的格如果是N，则箭头方向上第N格是星。
Write 1~5, make numbers no repeated in each Row, Column and Box. Additionally, each Row, Column and Box contains a star (use 0 instead), and stars cannot be horizontally, vertically or diagonally adjacent. If the arrow cell is N, the Nth cell on the direction the arrow points must be a star.
