/in/foo.cc: In function 'int main()':
/in/foo.cc:66:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(;i<Want.length();i++)if(Want[i]!=s[L][i])break;
        ~^~~~~~~~~~~~~~
/in/foo.cc:67:7: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   if(i==Want.length())ans++;
      ~^~~~~~~~~~~~~~~