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