View Compilation Error

0_0_39098529_3227.cpp: In function 'ULL get(int, int)':
0_0_39098529_3227.cpp:16:16: error: 'hs' was not declared in this scope
   16 |         return hs[r] - hs[l - 1] * P[r - l + 1];
      |                ^~