ICPC 2019 Shanghai Online Contest

Problem A

Unsolved.

Problem B

Solved by Xiejiadong. 00:20 (+1)

题意：一开始灯都是关着的，每次操作一个区间的灯使其状态相反，求最后开着的灯数量。

题解：卡内存，没法把所有灯的状态开下来。

于是离散化，记录操作的区间端点，扫一遍就好了。

Problem C

Solved by Xiejiadong && Kilo_5723. 03:45 (+1)

Problem D

Solved by Xiejiadong. 02:14 (+1)

Problem E

Solved by Kilo_5723. 04:01 (+)

Problem F

Solved by Kilo_5723. 02:02 (+)

Problem G

Unsolved.

Problem H

Unsolved.

Problem I

Solved by Kilo_5723. 00:46 (+2)

Problem J

Solved by Kilo_5723. 01:16 (+1)

Problem K

Solved by Xiejiadong. 00:06 (+)