View Compilation Error

0_0_33581857_20304.cpp: In function 'int Query(int, int, int, int, int)':
0_0_33581857_20304.cpp:33:45: error: 'rson' was not declared in this scope
  return Query(lson[now],l,mid,lt,mid)+Query(rson[now],mid+1,r,mid+1,rt);
                                             ^