/in/foo.cc: In function 'int BFS(Point, std::__cxx11::string)':
/in/foo.cc:27:98: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
    if (next.pos >= 0 && next.pos < len && next.pos != ' ' && !vis[next.pos] && (i != 3 || i == 3 && now.x))
                                                                                           ~~~~~~~^~~~~~~~
/in/foo.cc:39:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^