/in/foo.cc: In function 'int main()':
/in/foo.cc:20:13: warning: comparison of integer expressions of different signedness: 'int' and 'const size_type' {aka 'const long unsigned int'} [-Wsign-compare]
   20 |       if(pos!=string::npos)
      |          ~~~^~~~~~~~~~~~~~
/in/foo.cc:23:24: warning: comparison of integer expressions of different signedness: 'size_t' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   23 |        for(size_t i=0;i<pos;++i)
      |                       ~^~~~