Compilare: main.cpp: In function 'void Euler(int, int)': main.cpp:17:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[nod].size(); i++) ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:33:40: warning: iteration 262142 invokes undefined behavior [-Waggressive-loop-optimizations] for(int i=2; i<=(1<<18); i++) lg[i]=lg[i/2]+1; ~~~~~^~~~~~~~~~ main.cpp:33:19: note: within this loop for(int i=2; i<=(1<<18); i++) lg[i]=lg[i/2]+1; ~^~~~~~~~~