View Compilation Error

0_0_14058021_5694.cpp: In function 'int main()':
0_0_14058021_5694.cpp:28:10: error: 'pq' was not declared in this scope
   while(!pq.empty()) pq.pop();
          ^
0_0_14058021_5694.cpp:32:4: error: 'pq' was not declared in this scope
    pq.push(tmp);
    ^
0_0_14058021_5694.cpp:36:8: error: 'pq' was not declared in this scope
    tmp=pq.top();
        ^