Compilare: user.cpp: In function ‘void apm(int)’: user.cpp:38:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(unsigned i=0; i<nn; i++) ^ user.cpp: In function ‘int main()’: user.cpp:58:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<nod.size()-1; j++) ^