4X4的一些解决方案
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..2..0..2..0....1..0..0..2....2..0..2..0....2..0..1..1....2..0..2..0
..0..2..0..2....0..1..0..1....2..0..0..0....0..1..0..1....0..2..0..1
..2..1..1..0....1..0..2..0....1..0..2..0....2..1..1..0....2..0..1..0