Compilare: user.cpp: In function ‘int main()’: user.cpp:31:16: warning: ‘b1’ may be used uninitialized in this function [-Wmaybe-uninitialized] v[a1].a=v[b1].b; ^ user.cpp:30:16: warning: ‘a1’ may be used uninitialized in this function [-Wmaybe-uninitialized] int aux2=v[a1].a; ^