Compilare: main.cpp: In function 'void prec(std::string)': main.cpp:15:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 15 | for(i=1;i<a.size();i++) { | ~^~~~~~~~~ main.cpp: In function 'int main()': main.cpp:33:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 33 | for(i=0;i<a.size();i++){ | ~^~~~~~~~~ main.cpp:42:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 42 | for(i=0;i<rasp.size();i++) cout<<rasp[i]<<" "; | ~^~~~~~~~~~~~