n=4的一些解决方案:
..1..3....0..2....0..2....2..4....1..2....1..2....0..0....0..2....0..0....1..2
..2..3....2..2....1..2....2..2....3..4....2..2....1..2....1..2....1..2....2..2
..2..2....4..2....2..3....3..2....4..4....2..0....2..3....2..3....2..2....2..1
..2..2....4..2....2..4....4..4....4..4....3..2....2..2....2..2....3..2....2..0
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