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 141 / 148 1400
Tree distance 2 133 / 133 1500
Tree weight 94 / 99 1600
World tree 14 / 18 2000