Compilare: main.cpp: In function 'int main()': main.cpp:16:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 16 | for(int i=0; i<s.size(); i++) | ~^~~~~~~~~ main.cpp:33:16: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized] 33 | fout<<2*x+s.size()-8; | ~^~