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