Compilare: main.cpp: In function 'int main()': main.cpp:21:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 21 | for (int j=1; j<a.size(); j++) | ~^~~~~~~~~ main.cpp:28:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 28 | for (int i=0; i<v.size(); i++) g<<v[i]<<" "; | ~^~~~~~~~~