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面积为0的情况考虑一下。

Posted by yygy at 2013-03-15 11:25:39 on Problem 1279
In Reply To:死活A不了，求个数据，，， Posted by:wushangyangguang at 2013-03-15 11:18:28 
> 两小时了。。。死活不成，不知道怎么改了
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