Eroare de compilare: user.cpp: In function ‘int DFS(int)’: user.cpp:17:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[node].size();i++) ^ user.cpp:14:10: warning: variable ‘leaf’ set but not used [-Wunused-but-set-variable] bool leaf=0; ^ user.cpp: In function ‘void Read()’: user.cpp:31:9: warning: unused variable ‘i’ [-Wunused-variable] int i; ^ user.cpp: In function ‘int main()’: user.cpp:58:5: error: ‘cout’ was not declared in this scope cout << "Hello world!" << endl; ^