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