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