foo.cc: In function ‘int main()’:
foo.cc:8:30: warning: comparison of integer expressions of different signedness: ‘int’ and ‘std::__cxx11::basic_string<char>::size_type’ {aka ‘long unsigned int’} [-Wsign-compare]
    8 |         for(int i=0,w=0,l=0;i<s.size()-1;i++){
      |                             ~^~~~~~~~~~~
foo.cc:11:37: warning: comparison of integer expressions of different signedness: ‘int’ and ‘std::__cxx11::basic_string<char>::size_type’ {aka ‘long unsigned int’} [-Wsign-compare]
   11 |                 if(((i+1)%11==0)||(i==s.size()-2)){
      |                                    ~^~~~~~~~~~~~
foo.cc:17:30: warning: comparison of integer expressions of different signedness: ‘int’ and ‘std::__cxx11::basic_string<char>::size_type’ {aka ‘long unsigned int’} [-Wsign-compare]
   17 |         for(int i=0,w=0,l=0;i<s.size()-1;i++){
      |                             ~^~~~~~~~~~~
foo.cc:20:37: warning: comparison of integer expressions of different signedness: ‘int’ and ‘std::__cxx11::basic_string<char>::size_type’ {aka ‘long unsigned int’} [-Wsign-compare]
   20 |                 if(((i+1)%21==0)||(i==s.size()-2)){
      |                                    ~^~~~~~~~~~~~