Compilare: user.cpp: In function ‘int main()’: user.cpp:87:9: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(!v3[G[i].a] ) ^ user.cpp:51:63: warning: iteration 100004u invokes undefined behavior [-Waggressive-loop-optimizations] {V[i].erase(V[i].begin(),V[i].end()); v2[i]=v3[i]=0; h[i]=0; viz[i]=0;} ^ user.cpp:50:10: note: containing loop for(i=1;i<=200004;++i) ^