View Compilation Error

0_0_36782370_18813.cpp: In function 'int main()':
0_0_36782370_18813.cpp:21:12: error: statement cannot resolve address of overloaded function
       Q.pop;
            ^
0_0_36782370_18813.cpp:32:6: error: expected ';' before 'else'
      else{
      ^