Compilare: user.cpp: In function ‘void BFS(int, int*)’: user.cpp:14:22: 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(d,0,sizeof(d)); ^ user.cpp:20:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<G[x].size(); ++i) ^