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