/in/foo.cc: In function 'void dfs(int, int)':
/in/foo.cc:13:28: error: expected ')' before ';' token
   13 |         dfs(a[num].l, dep+1;
      |            ~               ^
      |                            )
/in/foo.cc:14:28: error: expected ')' before ';' token
   14 |         dfs(a[num].r, dep+1;
      |            ~               ^
      |                            )