/in/foo.cc: In function 'int main()':
/in/foo.cc:54:25: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses]
    if((now.sta)&(a[i].B)==0){
                 ~~~~~~~~^~~
/in/foo.cc:64:30: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::queue<nod>::size_type {aka long unsigned int}' [-Wformat=]
   printf("size=%d\n",q.size());
                              ^