View Compilation Error

0_0_35304084_12549.cpp: In function 'int main()':
0_0_35304084_12549.cpp:45:43: error: 'class std::queue<node>' has no member named 'top'
             while(!Q[mov].empty()&&Q[mov].top().time<=t&&cnt<n)//判断装车数是否超过n  
                                           ^
0_0_35304084_12549.cpp:47:24: error: 'class std::queue<node>' has no member named 'top'
                 Q[mov].top().ans = t+cost;  
                        ^
0_0_35304084_12549.cpp:48:36: error: 'class std::queue<node>' has no member named 'top'
                 v.push_back(Q[mov].top());  
                                    ^