View Compilation Error

0_0_37607643_32269.cpp: In function 'int main()':
0_0_37607643_32269.cpp:7:9: error: 'q' was not declared in this scope
    cin>>q[i];
         ^
0_0_37607643_32269.cpp:9:8: error: 'q' was not declared in this scope
   sort(q,q+n,cmd);
        ^
0_0_37607643_32269.cpp:9:14: error: 'cmd' was not declared in this scope
   sort(q,q+n,cmd);
              ^