2017 China Collegiate Programming Contest Final (CCPC2017)

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Problem A

Solved by dreamcloud.00:08:07

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Problem B

Unsolved.

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Problem C

Solved by oxx1108.00:33:54(-2)

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Problem D

Unsolved.

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Problem E

Solved by dreamcloud.00:18:27

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Problem F

Unsolved.

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Problem G

Solved by oxx1108.02:24:42(-1)

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Problem H

Unsolved.

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Problem I

开这道题目仅仅是因为清晰度极高的图片吸引了我。

Solved by Xiejiadong.04:53:38(-4)

题意:联通且颜色相同的边算作一组,会有$m$次修改,求每一次修改以后的组数。

题解:我们用$f[i]$表示结点$i$连出去的边所拥有的颜色数量,因为直接$\sum f[i]$会有$n$条边重复计算,所以一个图上的总的组数就是$\sum f[i]-n$

但是应该很容易的注意到一种特殊情况:当基环树环上的颜色相同时,我们应该把答案变成$\sum f[i]-n+1$

这样一来,我们就可以直接在线处理了

PS:dfs中要用来遍历路径的迭代器开成了全局变量,一口巨锅飞向cmy

Problem J

Solved by Xiejiadong.03:59:12

题意:给出$n$个时刻两个人分别在的位置,求一种可行的相邻车站之间所要花费的时间,使得满足限制条件。

题解:查分约束系统。对于一个东西

Problem K

Solved by Xiejiadong.00:15:55

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