n=4的一些解决方案:
..2..2..2..3..1..1..0..3....0..2..0..1..2..2..0..1....2..2..2..2..2..1..1..2
..2..2..2..3..1..1..0..3....0..2..0..1..2..2..0..1....2..2..2..2..2..1..1..2
..2..2..2..3..1..1..0..3....0..2..0..1..2..2..0..1....1..1..1..1..1..2..2..1
..2..2..2..3..1..1..0..3....0..2..0..1..2..2..0..1....1..1..1..1..1..2..2..1
..2..2..2..3..1..1..0..3....0..2..0..1..2..2..0..1....2..2..2..2..2..1..1..2