View Compilation Error

0_0_33620309_10574.cpp: In function 'int main()':
0_0_33620309_10574.cpp:29:25: error: 'class std::priority_queue<long long int, std::vector<long long int>, std::greater<long long int> >' has no member named 'clear'
   sort(q+1,q+1+m,cmp);Q.clear();
                         ^