Module Rerooting

Rerooting

**Frequency: 3/10** Reroot the tree to calculate new answer for the new root.

Resources

- [USACO: DP on Trees - Solving For All Roots ](https://usaco.guide/gold/all-roots?lang=cpp)

Problems

Tree distance 78 / 82 1400
Tree distance 2 80 / 80 1500
Tree weight 52 / 55 1600
World tree 7 / 7 2000