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
..1....1....1....1....1....0....1....1....1....0....1....1....0....1....1....1
..1....1....1....1....0....1....1....1....1....1....1....1....1....0....1....1
..2....2....1....2....1....0....1....2....2....1....2....2....1....0....2....1
..2....2....2....2....1....0....2....2....2....2....2....2....2....2....2....2
..3....2....2....2....2....2....2....3....3....1....0....3....2....0....3....2
..3....3....2....3....1....2....2....3....2....1....0....3....3....2....2....2
..2....3....3....3....2....3....2....4....2....3....0....1....3....2....3....3
..3....4....3....4....2....3....3....4....2....3....3....1....4....3....3....2
..3....3....3....4....2....4....2....5....4....3....3....4....3....3....4....2
..4....4....4....2....2....4....2....5....4....3....3....4....4....4....4....4
..3....3....4....2....3....2....4....6....0....4....4....1....4....3....0....4
..3....3....4....2....3....2....4....6....0....3....4....1....5....3....0....0
..4....4....0....3....4....3....5....2....5....4....0....0....4....0....0....4
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