8个皇后是很著名的问题。解不唯一。 N X N 情况, 6解唯一。4也是。解的数目随N上升极快。到20左右,已经接近天文 数目,同时,找其中一个解的时间也同样急剧上升。
6 QueensStep: 11 Unique #: 0 + | + | + | Q | + | + |
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8 QueensStep: 27 Unique #: 576 + | + | + | Q | + | + | + | + |
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22 QueensStep: 1417968 Unique #: 25062544 + | + | + | Q | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + |
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