2022-2023:teams:rand_and_accepted:abc247 [CVBB ACM Team]

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2022-2023:teams:rand_and_accepted:abc247 [CVBB ACM Team]

2022-2023:teams:rand_and_accepted:abc247

A-E 水题

F: 题意:有n个卡片每张卡片正面是Pi 背面是Qi P,Q为1-n的排列求取出若干张卡片使1-n至少出现一次的方案数

题解:每个环分开考虑,dp预处理长度为i的环的答案，最后乘起来就行

G:

H:

2022-2023/teams/rand_and_accepted/abc247.txt · 最后更改: 2022/04/11 11:15 由 wzy2001wzy