View Compilation Error

0_0_30782009_10482.cpp: In function 'int main()':
0_0_30782009_10482.cpp:48:20: error: cannot convert 'std::deque<_Tp, _Alloc>::empty<int, std::allocator<int> >' from type 'bool (std::deque<int>::)() const noexcept' to type 'bool'
     else if(q.empty) printf("%d\n",(r-l+1)%2);
                    ^