Compilare: main.cpp: In function 'int main()': main.cpp:25:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 25 | for (int i = 0; i < s.size(); i++) { | ~~^~~~~~~~~~ main.cpp:23:28: warning: unused variable 'ok' [-Wunused-variable] 23 | long long w, size = 0, ok = 1; | ^~