foo.cc: In function 'int main()':
foo.cc:12:4: error: 'dd' was not declared in this scope; did you mean 'd'?
   12 |    dd = 31;
      |    ^~
      |    d
foo.cc:14:4: error: 'dd' was not declared in this scope; did you mean 'd'?
   14 |    dd = 30;
      |    ^~
      |    d
foo.cc:17:5: error: 'dd' was not declared in this scope; did you mean 'd'?
   17 |     dd = 29;
      |     ^~
      |     d
foo.cc:19:5: error: 'dd' was not declared in this scope; did you mean 'd'?
   19 |     dd = 28;
      |     ^~
      |     d
foo.cc:21:11: error: 'dd' was not declared in this scope; did you mean 'd'?
   21 |   n = n + dd - d + 1;
      |           ^~
      |           d

[Hydro](https://hydro.ac)提供评测服务