Compilare: main.cpp: In function 'void factor(int)': main.cpp:37:23: 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] 37 | for(int j=0; j<ss.size(); j++) | ~^~~~~~~~~~ main.cpp:44:31: 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] 44 | for(int i=0; i<st.size(); i++) | ~^~~~~~~~~~ main.cpp:39:17: warning: unused variable 'n' [-Wunused-variable] 39 | int n=ss.size()-1; | ^ main.cpp: In function 'int main()': main.cpp:57:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 57 | for(int i=0; i<s.size(); i++) | ~^~~~~~~~~ main.cpp:61:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 61 | for(int i=0; i<s.size(); i++) | ~^~~~~~~~~