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因为不可能存在奇圈

Posted by xyllyx at 2008-01-31 18:22:36
In Reply To:还想跟您要反例呢,我觉得一个board可以看作二分图,所以怎么搞都可以找到合法的方案 Posted by:xyllyx at 2008-01-31 18:12:39


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