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