Compilare: main.cpp: In function 'std::vector<int> BFS(int)': main.cpp:23:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < g[node].size(); i ++) ~~^~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:54:23: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized] add_edge(x, y); ^ main.cpp:54:23: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized]