n=30=self-3=ne4=w6=e7=sw的一些解(倒数方向总计10)
..0..0..0....6..4..0....6..4..7....0..0..0....0..6..4....6..4..0....0..0..7
..0..0..0....0..0..0....0..3..0....0..6..4....6..4..7....6..4..0....0..3..0
..0..0..7....6..4..0....0..0..0....0..0..0....0..3..0....0..0..0....0..0..7
..0..3..0....6..4..0....6..4..7....6..4..0....0..0..0....0..7..0....0..3..0
..0..0..0....6..4..0....0..3..0....6..4..0....0..0..0....3..0..0....0..6..4
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