虚树 Virtual-Tree
[SDOI2017] 树点涂色 [LCT/线段树/LCA]
Steam Cutting-Hand Beginners' Guide
UVa1596 Bug Hunt
BZOJ4627 [BeiJing2016]回转寿司 [树状数组]
[NOI2014] 魔法森林 [动态树]
Unnecessary