# 跃迁引擎启动

rank solved A B C D E F G H I J K M
87 7 O . . O Ø Ø O . ! O . Ø

# A

Solved by Henry and Forsaken.

# D

Solved by Henry and Forsaken.

# F

UpSolved by XLor.

$$f_u(x)=\frac{1}{b_u} \int_{0}^{x} \prod_{v \in son(u)} (1-f_v(t)) dt$$

$$f_u(x)=\begin{cases} \frac{x}{b_u} & x \in [0,b_u] \ 0 & others \end{cases}$$

Solved by XLor.

# I

UnSolved by XLor and Forsaken.

Solved by XLor.