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