It matters. 如果放一个红块在对角线上,白块的数目就只有2008而不是2009了。除非能证明对角线上不能放红块,I'm not convinced。
It matters. 如果放一个红块在对角线上,白块的数目就只有2008而不是2009了。除非能证明对角线上不能放红块,I'm not convinced。
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