View Compilation Error

0_0_34785770_18829.cpp: In function 'int main()':
0_0_34785770_18829.cpp:55:34: error: passing 'const std::queue<int>' as 'this' argument of 'void std::queue<_Tp, _Sequence>::pop() [with _Tp = int; _Sequence = std::deque<int, std::allocator<int> >]' discards qualifiers [-fpermissive]
             queue.top().list.pop();//当前后继节点出队列
                                  ^