Compilare: user.cpp: In function ‘void DFS(int)’: user.cpp:25:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<Arb[node].size();i++) ^ user.cpp: In function ‘void Solve()’: user.cpp:107:19: warning: unused variable ‘aux2’ [-Wunused-variable] int aux=x,aux2=y; ^ user.cpp: In function ‘int main()’: user.cpp:151:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("arb4.out","w",stdout); ^