2019 Multi-University,HDU Day 7

Problem A

Kilo_5723:

Xiejiadong:

Problem B

Unsolved.

Problem C

Unsolved.

Problem D

Unsolved.

Problem E

Unsolved.

Problem F

Unsolved.

Problem G

Unsolved.

Problem H

Unsolved.

Problem I

Unsolved.

Problem J

Unsolved.