链接https://nanti.jisuanke.com/t/31455 思路 首先先枚举把剩下的数填入星号的情况(其实就是枚举星号的排列),这是对方所能知道的所有信息,然后对方将取八种决策中最优的情况,而因为井号的存在,所以其排列也会影响每种决策的分数,所以接着要枚举井号的排列情况,对于每种情况累加每个决策的分数,最后枚举完后,要除以井号排列数(期望=分数*概率),然后对方便会选择期望最高的决策,累加到最后答案中,枚举完所有星号的之后,需要将最后答案除以星号排列数 #include<bits/…

https://nanti.jisuanke.com/t/31455 题意 给一个3*3的方格填入 1-9 九个数 有些数是已知的,有些数是对方已知但我未知的,有些数是大家都未知的 我要计算取得最大的对应值的期望 分析 题意有点难懂. 首先先枚举把剩下的数填入星号的情况(其实就是枚举星号的排列),这是对方所能知道的所有信息,然后对方将取八种决策中最优的情况,而因为井号的存在,所以其排列也会影响每种决策的分数,所以接着要枚举井号的排列情况,对于每种情况累加每个决策的分数,最后枚举完后,要除以井号排…

ACM-ICPC 2018 徐州赛区网络预赛 G. Trace (思维,贪心) Trace 问答问题反馈 只看题面 35.78% 1000ms 262144K There's a beach in the first quadrant. And from time to time, there are sea waves. A wave ( xx , yy ) means the wave is a rectangle whose vertexes are ( 00 , 00 ), ( xx ,…

ACM-ICPC 2018 徐州赛区网络预赛 J. Maze Designer J. Maze Designer After the long vacation, the maze designer master has to do his job. A tour company gives him a map which is a rectangle. The map consists of N \times MN×M little squares. That is to say, the h…

H.Ryuji doesn't want to study 27.34% 1000ms 262144K   Ryuji is not a good student, and he doesn't want to study. But there are n books he should learn, each book has its knowledge a[i]a[i]. Unfortunately, the longer he learns, the fewer he gets. That…

传送门 题面: In a world where ordinary people cannot reach, a boy named "Koutarou" and a girl named "Sena" are playing a video game. The game system of this video game is quite unique: in the process of playing this game, you need to consta…

In a world where ordinary people cannot reach, a boy named "Koutarou" and a girl named "Sena" are playing a video game. The game system of this video game is quite unique: in the process of playing this game, you need to constantly fac…

262144K   Ryuji is not a good student, and he doesn't want to study. But there are n books he should learn, each book has its knowledge a[i]a[i]. Unfortunately, the longer he learns, the fewer he gets. That means, if he reads books from ll to rr, he…

262144K   Morgana is learning computer vision, and he likes cats, too. One day he wants to find the cat movement from a cat video. To do this, he extracts cat features in each frame. A cat feature is a two-dimension vector <x, y>. If xi​= xj​ and yi…

Mur loves hash algorithm, and he sometimes encrypt another one's name, and call him with that encrypted value. For instance, he calls Kimura KMR, and calls Suzuki YJSNPI. One day he read a book about SHA-256,which can transit a string into just 256 b…