foo.cc: In function 'int main()':
foo.cc:18:19: error: 'D' was not declared in this scope
   18 |  cin >> n >> m >> D;
      |                   ^
foo.cc:21:43: error: invalid types 'int[int]' for array subscript
   21 |  for(int i = 0; i < m - 1; i++) sum += d[i];
      |                                           ^

[Hydro](https://hydro.ac)提供评测服务