Compilare: user.cpp: In function ‘void BFS(int)’: user.cpp:37:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<G[y].size();i++){ ^ user.cpp: In function ‘void read()’: user.cpp:23:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&n,&m,&nod); ^ user.cpp:25:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^