/in/foo.cc: In function 'void output_data()':
/in/foo.cc:132:27: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::queue<data>::size_type {aka long unsigned int}' [-Wformat=]
  printf("%d\n",mayi.size());
                           ^
/in/foo.cc: In function 'int direction(int, int, int, int, int)':
/in/foo.cc:68:12: warning: 'dir' may be used uninitialized in this function [-Wmaybe-uninitialized]
    dir=(dir+3)%4;
        ~~~~^~~