Compilare: main.cpp: In function 'void factor(int)': main.cpp:36:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::__cxx11::basic_string<char> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 36 | for(int j=0; j<ss.size(); j++) | ~^~~~~~~~~~ main.cpp:41:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::__cxx11::basic_string<char> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 41 | for(int i=0; i<st.size(); i++) | ~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:54:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 54 | for(int i=0; i<s.size(); i++) | ~^~~~~~~~~ main.cpp:58:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 58 | for(int i=0; i<s.size(); i++) | ~^~~~~~~~~