n=4的一些解
..3..2..3..3....3..2..2..2....2..3..3..2....2..3..2..2....3..2..3..3
..2..3..2..2....2..1..1..1....3..1..1..3....3..1..3..1....2..1..2..2
..3...0...0...2…..3...0...2…..3...2...2...3...1...2...1…3...0...0...0
..3..2..2..2....2..1..1..3....2..1..1..1....3..2..0..3....2..1..0..0
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