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 187 / 201 1400
Tree distance 2 182 / 182 1500
Tree weight 131 / 140 1600
World tree 19 / 24 2000