/in/foo.cc: In function 'long long int ISAP()':
/in/foo.cc:97:34: error: 'road' was not declared in this scope; did you mean 'read'?
   97 |                         pre[edge[road].to] = x;
      |                                  ^~~~
      |                                  read
/in/foo.cc:113:30: error: 'road' was not declared in this scope; did you mean 'read'?
  113 |                         for (road = link[x]; road; road = edge[road].next)
      |                              ^~~~
      |                              read