foo.cc: In function ‘void dfs(int, int)’:
foo.cc:12:20: error: ‘deep’ was not declared in this scope; did you mean ‘dep’?
   12 |         dfs(a[u].l,deep+1);
      |                    ^~~~
      |                    dep
foo.cc: In function ‘int main()’:
foo.cc:19:32: error: ‘r’ was not declared in this scope
   19 |                 cin>>a[i].l>>a[r].r;
      |                                ^