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 119 / 127 1400
Tree distance 2 117 / 117 1500
Tree weight 84 / 89 1600
World tree 14 / 16 2000