View Compilation Error

0_0_36602686_17984.cpp: In function 'int main()':
0_0_36602686_17984.cpp:47:6: error: 'class std::priority_queue<long long int>' has no member named 'clear'
   p1.clear();
      ^
0_0_36602686_17984.cpp:48:6: error: 'class std::priority_queue<long long int>' has no member named 'clear'
   p2.clear();
      ^