Compilare: main.cpp: In function 'std::string divideBy2(std::string)': main.cpp:12:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 12 | for(int i = 0;i < s.size();i++){ | ~~^~~~~~~~~~