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Ladies and gentlemen, please sit up straight. Don't tilt your head. I'm serious. For n n given strings S 1 ,S 2 ,⋯,S n  S1,S2,⋯,Sn, labelled from 1 1 to n n, you should find the larg

Recognizing junk mails is a tough task. The method used here consists of two steps:  1) Extract the common characteristics from the incoming email.  2) Use a filter matching the set of common charac

HDU 2473——junk mails Recognizing junk mails is a tough task. The method used here consists of two steps: 1) Extract the common characteristics from the incoming email. 2) Use a filter matching t