Compilare: main.cpp: In function 'int main()': main.cpp:22:21: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 22 | for(int i = 0; i<s.size(); i++) | ~^~~~~~~~~ main.cpp:47:25: warning: 'minuss' may be used uninitialized [-Wmaybe-uninitialized] 47 | x += nr * minuss; | ~~~^~~~~~~~ main.cpp:21:17: note: 'minuss' was declared here 21 | int nr, ok, minuss; | ^~~~~~