n=4的一些解
..3..2..3..2..3..3....3..2..2..2..3..2....3..2..2..2..3..2....3..2..2..2..3..3
..1..2..1..2..1..2....1..2..0..1..1..0....1..2..0..1..1..0....1..2..0..1..1..2
..3..2.3..2.0...0...2.0...0...3.0...2...3.0...2...3...2...2...0...3...3...2...3...2...2...2...0...3...3...3...2...2...0
..3..0..1..1..2..0....1..0..0..2..2..0....1..0..2..1..2..0....2..0..1..0..0..0
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