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 129 / 136 1400
Tree distance 2 125 / 125 1500
Tree weight 87 / 92 1600
World tree 14 / 16 2000