/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: At global scope:
/in/foo.cc:15:8: error: redefinition of 'std::string s'
   15 | string s;
      |        ^
/in/foo.cc:3:8: note: 'std::string s' previously declared here
    3 | string s;
      |        ^
/in/foo.cc:16:5: error: redefinition of 'int main()'
   16 | int main()
      |     ^~~~
/in/foo.cc:4:5: note: 'int main()' previously defined here
    4 | int main()
      |     ^~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:19:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   19 |         for(int i=0;i<s.size();i++)
      |                     ~^~~~~~~~~