View Compilation Error

0_0_37482887_11951.cpp: In function 'int Query(int, int, int, int, int)':
0_0_37482887_11951.cpp:33:14: error: 'retrun' was not declared in this scope
  if(l>mid+1) retrun Query(l,r,mid+1,R,rt<<1|1);
              ^