待补
主席树视频:https://www.bilibili.com/video/av56485341?p=2
D. Salary Changing
D. Power Products https://codeforces.com/contest/1247/problem/D
Constructing Roads In JGShining's Kingdom
Forest Program Gym - 102361F
主席树视频:https://www.bilibili.com/video/av56485341?p=2