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