8個皇后是很著名的問題。解不唯一。 N X N 情況, 6解唯一。4也是。解的數目隨N上升極快。到20左右,已經接近天文 數目,同時,找其中一個解的時間也同樣急劇上升。
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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