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D题。。。真想砍人

Posted by pfz1stp at 2007-06-03 17:04:48 
交了40多遍都不过。。最后我都加了截时了还是超时。。。。。。。。。。。
啊。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。
要好好学图论了。。。。。。。。。。。。
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