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