foo.cc: In function 'int main(int, const char**)':
foo.cc:77:17: error: expected primary-expression before ']' token
   77 |  delete visited[];
      |                 ^
foo.cc:78:11: error: expected primary-expression before ']' token
   78 |  delete a[];
      |           ^

[Hydro](https://hydro.ac)提供评测服务