n=3的一些解决方案:
..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0....0
..0....1....1....1....0....1....0....1....1....1....1....1....1....0....1....1
..1....1....1....1....1....0....1....0....1....1....1....1....1....0....1....1
..1....1....2....1....1....0....1....0....2....2....2....2....2....1....2....1
..2....2....2....2....2....2....1....2....2....2....1....2....1....1....2....2
..2....1....2....1....1....2....2....2....2....3....1....2....1....2....3....1
..3....1....3....1....1....3....2....2....3....2....1....3....3....2....2....1
..3....3....3....1....1....3....0....3....3....2....1....3....3....3....2....3
..0....3....3....3....3....3....0....3....3....4....3....4....4....3....3....3
..0....4....4....3....3....3....3....2....4....2....3....3....3....4....2....4
..4....4....3....4....4....4....3....2....4....4....3....3....4....3....2....4
..0....5....3....3....3....4....4....4....3....2....4....0....4....4....4....2
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