View Compilation Error

0_0_37771512_12326.cpp: In function 'int main()':
0_0_37771512_12326.cpp:44:8: error: 'q' was not declared in this scope
  while(q--){
        ^
0_0_37771512_12326.cpp:48:9: error: 'n' was not declared in this scope
   int r=n;
         ^
0_0_37771512_12326.cpp:58:7: error: 'mid' was not declared in this scope
     l=mid-1;
       ^
0_0_37771512_12326.cpp:61:7: error: 'mid' was not declared in this scope
     r=mid+1;
       ^