View Compilation Error

0_0_39526577_14318.cpp: In function 'int main()':
0_0_39526577_14318.cpp:45:28: error: invalid operands of types 'int' and 'int [100001]' to binary 'operator*'
   45 |             memset(op, 0, 4*op);
      |                           ~^~~
      |                           | |
      |                           | int [100001]
      |                           int