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 74 / 78 1400
Tree distance 2 77 / 77 1500
Tree weight 48 / 51 1600
World tree 7 / 7 2000