Every row,column and region must contain the dights from 1 to 9.The value in the top left corner of a colored area corresponds to the difference the biggest dight of this area and the small one(s).

• 将1-9填入空格，使得每行、列、九宫格都含1-9，每个框的左上角的数字表示该框内最大数与其他数字的和的差值的绝对值。