Compilare: main.cpp: In function 'int to_int(const std::string&)': main.cpp:7:25: 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) | ~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:20:21: warning: unused variable 'mins' [-Wunused-variable] 20 | int mins = 2 * a; | ^~~~