RQNOJ382[自然的谜语]

KMP练习，第一次写KMP。

CODE:

/*

PROGRAM: $PROGRAM

AUTHOR: Su Jiao

DATE: 2010-6-12

DESCRIPTION:

RQNOJ382

*/

#include <iostream>

using std::cin;

using std::cout;

using std::endl;

#include <string>

using std::string;

#include <vector>

using std::vector;

 

class Application

{

      string s1,s2;

      public:

      Application()

      {

                   std::ios::sync_with_stdio(false);

                   cin>>s1>>s2;

      }

      int run()

      {

          vector<int> shift;

          int i,j;

          vector<int> pi(s1.length());

          j=pi[0]=-1;

          for (i=1;i<s1.length();i++)

          {

              while (j>=0&&s1[j+1]!=s1[i]) j=pi[j];

              if (s1[j+1]==s1[i]) j++;

              pi[i]=j;

          }

          j=-1;

          for (i=0;i<s2.length();i++)

          {

              while (j>=0&&s1[j+1]!=s2[i]) j=pi[j];

              if (s1[j+1]==s2[i]) j++;

              if (j==s1.length()-1)

                 j=pi[j],shift.push_back(1+(i-s1.length()+1));

          }

          if (shift.size())

             for (cout<<shift.size()<<endl,i=0;i<shift.size();i++)

                 cout<<shift[i]<<endl;

          else cout<<“There must be something wrong.”<<endl;

          return 0;

      }

};

 

int main()

{

    Application app;

    return app.run();

}