n=4的一些解
..0..0..0....0..3..0....0..3..0....0..0..0....0..3..0....2..2..0....0..0..0
..2..2..0....0..0..3....0..0..1....1..1..0....0..0..0....2..2..1....1..3..0
..2..2..0....0..3..0....0..3..1....0..0..3....3..0..0....1..0..1....1..0..0
..0..0..0....0..1..1....0..0..0....1..1..0....0..3..0....1..0..0....0..0..0