填九宫格帮帮忙.
x x 6 x x 7 x x 9
8 x x x 3 x 1 x x
9 x x 6 x 5 x 3 x
x x 3 x x x x 1 8
x x x 9 x 1 x x x
2 1 x x x x 6 x x
x 6 x 7 x 3 x x 1
x x 9 x 2 x x x 4
7 x x 8 x x 5 x x