Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:53:30: error: ‘read’ was not declared in this scope blen = read(0, buf, CHUNK); ^ user.cpp:65:18: error: ‘struct vlist’ has no member named ‘next’ edges[i].next = adj_list[u]; ^~~~ user.cpp:93:56: error: ‘write’ was not declared in this scope write(1, obuf + oblen + 1, (CHUNK >> 2) - oblen - 2); ^ user.cpp:51:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bfs.in", "r", stdin); ^ user.cpp:52:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bfs.out", "w", stdout); ^