/in/foo.cc: In function 'int main()':
/in/foo.cc:13:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(i=0;i<para.size();i++)
             ~^~~~~~~~~~~~
/in/foo.cc:23:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(i=0;i<word.size();i++)
             ~^~~~~~~~~~~~
/in/foo.cc:24:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(j=i+1;j<word.size();j++)
                   ~^~~~~~~~~~~~