/in/foo.cc: In function 'int main()':
/in/foo.cc:7:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    7 |         for(int i=0;i<s.size();i++){
      |                     ~^~~~~~~~~
/in/foo.cc:24:32: warning: suggest explicit braces to avoid ambiguous 'else' [-Wdangling-else]
   24 |                         else if(s[i]=='0')
      |                                ^