foo.cc: In function ‘int main()’:
foo.cc:13:30: warning: comparison of integer expressions of different signedness: ‘int’ and ‘std::__cxx11::basic_string<char>::size_type’ {aka ‘long unsigned int’} [-Wsign-compare]
   13 |                 for(int j=0;j<=p.size()-1;j=j+1)
      |                             ~^~~~~~~~~~~~
foo.cc:25:34: warning: comparison of integer expressions of different signedness: ‘int’ and ‘std::__cxx11::basic_string<char>::size_type’ {aka ‘long unsigned int’} [-Wsign-compare]
   25 |                         else if(j==p.size()-1 && j-st+1!=0 && p[j]!=',')
      |                                 ~^~~~~~~~~~~~