Compilare: user.cpp: In function ‘void euler(int)’: user.cpp:13:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while((v[v[nod][i]].size())<2 && i<v[nod].size()-1) i++; ~^~~~~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:41:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<d.size()-1;i++) ~^~~~~~~~~~~