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貌似这道题少了个判不可能.....

Posted by wywcgs at 2006-10-09 10:22:43 on Problem 1240
In Reply To:好像条件弱一些…… Posted by:frkstyc at 2006-10-09 09:32:53 
真恶心....
不要说其他的题都有出处....
那就BT了.....
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