View Compilation Error

0_0_26088480_2625.cpp: In function 'int main()':
0_0_26088480_2625.cpp:12:12: error: 'class std::priority_queue<int, std::vector<int>, std::greater<int> >' has no member named 'clear'
         q1.clear(); q2.clear();
            ^
0_0_26088480_2625.cpp:12:24: error: 'class std::priority_queue<int, std::vector<int>, std::greater<int> >' has no member named 'clear'
         q1.clear(); q2.clear();
                        ^