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 56 / 59 1400
Tree distance 2 58 / 58 1500
Tree weight 30 / 32 1600
World tree 2 / 2 2000