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