# 跃迁引擎启动

rank solved A B C D E F G H I J K
130 6 . . . O Ø Ø . . O O O

Solved by Henry.

# E

UpSolved by XLor.

# F

UpSolved by XLor.

up and down 树形 dp。

Solved by Henry.

Solved by Henry.

Solved by Henry.