It matters. 如果放一個紅塊在對角線上,白塊的數目就隻有2008而不是2009了。除非能證明對角線上不能放紅塊,I'm not convinced。
It matters. 如果放一個紅塊在對角線上,白塊的數目就隻有2008而不是2009了。除非能證明對角線上不能放紅塊,I'm not convinced。
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