/in/foo.cc: In function 'int main()':
/in/foo.cc:19:8: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   if(ii==string::npos)
      ~~^~~~~~~~
/in/foo.cc:14:6: warning: unused variable 'ii' [-Wunused-variable]
  int ii=i;
      ^~
/in/foo.cc:18:16: warning: 'ii' may be used uninitialized in this function [-Wmaybe-uninitialized]
   int ii=b.find(a,ii);
          ~~~~~~^~~~~~