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 103 / 109 1400
Tree distance 2 102 / 102 1500
Tree weight 74 / 78 1600
World tree 12 / 14 2000