Compilare: user.cpp: In function ‘void desc(int)’: user.cpp:30:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < prim.size() && prim[i] <= n ; ++i){ ^ user.cpp: In function ‘int main()’: user.cpp:55:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < prim.size() ; ++i){ ^ user.cpp:67:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < prim.size() ; ++i){ ^