n=4的一些解
..0..x..1..x…0..x.1..x…0...x..1..x.…0..x.1..x
..x..2…x..0…x..0..x..2
..0..x.3..x…3..x.4..x…2..x.3…x…3…x.4..x…3..x.0..x
..x.1.x..0…x.5.x..3…x.2.x..1…x.5.x..1…x.4.x.5
..4..x..5..x…6..x..7..x…4..x.5.x…0..x..2..x…5.x..0..x
…x..0..x..5…x..2…x..1…x..0..x..6…x..4…x..3…x..2..x..1
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