Compilare: user.cpp: In function ‘void bfs(int)’: user.cpp:37:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i<G[nod].size(); i++) { ^ user.cpp: In function ‘void read()’: user.cpp:20:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d", &n, &m, &x, &y); ^ user.cpp:23:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &xx, &yy); ^