I have seen many times that last/second last question of div 3 is on trees like<br>↵
- [627 f](https://codeforces.com/contest/1324/problem/F) teached me about rerooting<br>↵
- [629 e](https://codeforces.com/contest/1328/problem/E) teached me prefix postfix number<br>↵
- [624 e](https://codeforces.com/contest/1311/problem/E) constructive algo on tree<br>↵
and i many more div 3 i saw tree question , so is that a conicidence or what
- [627 f](https://codeforces.com/contest/1324/problem/F) teached me about rerooting<br>↵
- [629 e](https://codeforces.com/contest/1328/problem/E) teached me prefix postfix number<br>↵
- [624 e](https://codeforces.com/contest/1311/problem/E) constructive algo on tree<br>↵
and i many more div 3 i saw tree question , so is that a conicidence or what