Compilare: user.cpp: In member function ‘void Graph::remove_edge(int, int)’: user.cpp:51:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < nodes[src].neighbors.size(); i++) ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ user.cpp:54:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < nodes[dst].neighbors.size(); i++) ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ user.cpp: In member function ‘bool Graph::has_edge(int, int)’: user.cpp:61:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < nodes[src].neighbors.size(); i++) ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ user.cpp: In function ‘void dfs(Graph&, int, std::vector<int>&)’: user.cpp:82:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < g.get_neighbors(node).size(); i++) { ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~