Module DP on tree

DP on tree

**Frequency: 6/10** DP, but on tree.

Resources

- [USACO: DP on trees](https://usaco.guide/gold/dp-trees?lang=cpp)

Problems

Tree coloring 590 / 610 1200
Tree coloring 2 506 / 512 1200
Maximum sum path 419 / 471 1300
Path with length k 387 / 397 1300
Subgraph 337 / 348 1300
Beautiful tree 292 / 300 1500
Company 229 / 236 1700
Zero tree 194 / 212 1700
Selfie 121 / 136 1800