/in/foo.cc: In function 'int main()':
/in/foo.cc:19:35: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::deque<int>::size_type {aka long unsigned int}' [-Wformat=]
    printf("Size = %d\n",que.size());
                                   ^
/in/foo.cc:24:12: warning: unknown escape sequence: '\d'
     printf("Empty!\d");
            ^~~~~~~~~~