/in/foo.cc: In function 'void bfs(E*, int*, int*)':
/in/foo.cc:56:25: 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(num, 168, sizeof(num));
                         ^
/in/foo.cc: At global scope:
/in/foo.cc:72:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main() {
      ^