Compilare: user.cpp: In function ‘void bfs(int, int*)’: user.cpp:17:28: warning: argument to ‘sizeof’ in ‘void* memset(void*, int, size_t)’ call is the same expression as the destination; did you mean to dereference it? [-Wsizeof-pointer-memaccess] memset(cost, -1, sizeof(cost)); ^ user.cpp:22:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<G[nod].size(); ++i) ^