Compilare: main.cpp: In function 'int main()': main.cpp:14:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 14 | for(int i = 0; i < c.size(); i++){ | ~~^~~~~~~~~~ main.cpp:29:10: warning: variable 'ok' set but not used [-Wunused-but-set-variable] 29 | bool ok = 0; | ^~