規則：在空格中填入1∼9，使得每一行、列、宮中的數字都沒有重複外；標示處的數字表示該處到所指方向的數字9之距離。
rule : Apply classic sudoku rules. Some arrows are marked in the grid. Each arrow points to the digit 9 in the respective row or column. The digit in the cell with the arrow is the distance from this cell to the corresponding digit 9.
解答 result：
