2018-2019 ACM-ICPC, Asia Seoul Regional Contest

Problem A

Solved by zerol. 02:10 (+)

Problem B

Unsolved.

Problem C

Unsolved.

Problem D

Solved by zerol. 00:11 (+1)

Problem E

Solved by kblack. 03:15 (+3)

Problem F

Solved by ultmaster. 01:51 (+3)

题意：表达式解析，要求判出非法、合法。如果合法，建出表达式树，问是否是一棵二叉树。

题解：如题，模拟。脑残少判了一个地方，自闭一小时。

坑点：经枚举题意，一个节点不算二叉树。

Problem G

Unsolved. (-4)

Problem H

Unsolved.

Problem I

Unsolved.

Problem J

Unsolved.

Problem K

Solved by kblack. 01:32 (+)

Problem L

Solved by kblack. 01:04 (+1)