Compilare: user.cpp: In function ‘void ciclueulerian()’: user.cpp:27:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<v[nu].size();j++) ^ user.cpp: In function ‘int main()’: user.cpp:53:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<v[x].size();j++) ^ user.cpp: In function ‘void ciclueulerian()’: user.cpp:17:14: warning: ‘sel’ may be used uninitialized in this function [-Wmaybe-uninitialized] int e,nu,sel; ^