2018-2019 ACM-ICPC Nordic Collegiate Programming Contest (NCPC 2018)

One,Two,Three,AK

Xiejiadong签到失败，承担了所有的罚时。

dreamcloud全场最佳。

Problem A

Unsolved.

Problem B

Solved by Xiejiadong.

签到题，题意有毒。

Problem C

Solved by dreamcloud.

Problem D

Solved by dreamcloud.

Problem E

Solved by oxx1108.

Problem F

Unsolved.

Problem G

Unsolved.

Problem H

Solved by dreamcloud.

Problem I

Solved by dreamcloud.

Problem J

Solved by Xiejiadong.

题意：给出00、01、10、11子序列的个数，构造符合题意的01串。

题解：首先根据00和01可以计算出0和1的个数。

假设0的个数为$x$，1的个数为$y$，当且仅当$b+c=xy$的时候有解。当然，不存在这样的$x$、$y$也无解。

然后就是考虑怎么构造$b$的个数，线吧素偶有的1放在0前面，此时$b=0$，然后暴力的把1移到所有的0后面，每次$b+=x$，最后剩下$b%x$，表示最后一个1前面0的个数。

需要注意$a=0$的情况有两种可能，$x=0$或者$x=1$，$d$的情况也是如此。

注意特判$a=0,b=0,c=0,d=0$的情况

Problem K

Solved by dreamcloud.

ECNU Foreigners

Problem A

Solved by . 04:03 (+1)

Problem B

Solved by . 00:20 (+)

Problem C

Solved by . 00:29 (+)

Problem D

Solved by . 03:49 (+)

Problem E

Solved by . 01:49 (+)

Problem F

Unsolved.

自闭了。

Problem G

Unsolved.

Problem H

Solved by . 02:26 (+1)

Problem I

Solved by . 01:16 (+)

Problem J

Solved by . 00:45 (+)

Problem K

Solved by . 00:24 (+1)