Compilare: user.cpp: In constructor ‘Node::Node(int, Graf*)’: user.cpp:21: warning: ‘Node::started_marking’ will be initialized after user.cpp:20: warning: ‘Graf* Node::parent’ user.cpp:24: warning: when initialized here user.cpp: In member function ‘void Graf::dfs(Node*)’: user.cpp:49: warning: suggest parentheses around assignment used as truth value user.cpp: In member function ‘std::stack<Node*, std::deque<Node*, std::allocator<Node*> > > Graf::computeTopology()’: user.cpp:59: warning: comparison between signed and unsigned integer expressions user.cpp: In destructor ‘Graf::~Graf()’: user.cpp:125: warning: comparison between signed and unsigned integer expressions