/in/foo.cc: In function 'int main()':
/in/foo.cc:110:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
      if(Bstr[i].length()>len) continue;
         ~~~~~~~~~~~~~~~~^~~~
/in/foo.cc:113:25: warning: format '%d' expects argument of type 'int', but argument 2 has type 'long long int' [-Wformat=]
     printf("%I64d\n",ans);
                         ^