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 86 / 92 1400
Tree distance 2 87 / 87 1500
Tree weight 60 / 64 1600
World tree 9 / 9 2000