Domination Time Limit: 8 Seconds      Memory Limit: 131072 KB      Special Judge Edward is the headmaster of Marjar University. He is enthusiastic about chess and often plays chess with his friends. What's more, he bought a large decorative chessboar…

Domination Time Limit: 8 Seconds      Memory Limit: 131072 KB      Special Judge Edward is the headmaster of Marjar University. He is enthusiastic about chess and often plays chess with his friends. What's more, he bought a large decorative chessboar…

Domination Time Limit: 1 Sec Memory Limit: 256 MB 题目连接 http://acm.zju.edu.cn/onlinejudge/showProblem.do?problemCode=3822 Description Edward is the headmaster of Marjar University. He is enthusiastic about chess and often plays chess with his friends.…

Domination Time Limit: 8 Seconds      Memory Limit: 131072 KB      Special Judge Edward is the headmaster of Marjar University. He is enthusiastic about chess and often plays chess with his friends. What's more, he bought a large decorative chessboar…

Domination Time Limit: 8 Seconds      Memory Limit: 131072 KB      Special Judge Edward is the headmaster of Marjar University. He is enthusiastic about chess and often plays chess with his friends. What's more, he bought a large decorative chessboar…

Domination Time Limit: 8 Seconds      Memory Limit: 131072 KB      Special Judge Edward is the headmaster of Marjar University. He is enthusiastic about chess and often plays chess with his friends. What's more, he bought a large decorative chessboar…

题目链接:zoj 3822 Domination 题目大意:给定一个N∗M的棋盘,每次任选一个位置放置一枚棋子,直到每行每列上都至少有一枚棋子,问放置棋子个数的期望. 解题思路:大白书上概率那一张有一道类似的题目,可是由于时间比較久了,还是略微想了一下. dp[i][j][k]表示i行j列上均有至少一枚棋子,而且消耗k步的概率(k≤i∗j),由于放置在i+1~n上等价与放在i+1行上,同理列也是如此.所以有转移方程: dp[i][j][k+1]+=dp[i][j][k]∗(n−k)(S−k) d…

Domination 题目链接:https://odzkskevi.qnssl.com/9713ae1d3ff2cc043442f25e9a86814c?v=1531624384 Edward is the headmaster of Marjar University. He is enthusiastic about chess and often plays chess with his friends. What's more, he bought a large decorative…

Domination Time Limit: 8 Seconds      Memory Limit: 131072 KB      Special Judge Edward is the headmaster of Marjar University. He is enthusiastic about chess and often plays chess with his friends. What's more, he bought a large decorative chessboar…

E - Domination Time Limit:8000MS     Memory Limit:131072KB     64bit IO Format:%lld & %llu Submit Status Description Edward is the headmaster of Marjar University. He is enthusiastic about chess and often plays chess with his friends. What's more, he…

3799567 2014-10-14 10:13:59                                                                     Accepted                                                             3822 C++ 1870 71760 njczy2010 3799566 2014-10-14 10:13:25                            …

Domination Time Limit: 8 Seconds      Memory Limit: 131072 KB      Special Judge Edward is the headmaster of Marjar University. He is enthusiastic about chess and often plays chess with his friends. What's more, he bought a large decorative chessboar…

D - Domination Time Limit:8000MS     Memory Limit:131072KB     64bit IO Format:%lld & %llu Description Edward is the headmaster of Marjar University. He is enthusiastic about chess and often plays chess with his friends. What's more, he bought a larg…

6972 Domination Edward is the headmaster of Marjar University. He is enthusiastic about chess and often plays chess with his friends. What’s more, he bought a large decorative chessboard with N rows and M columns. Every day after work, Edward will pl…

题目链接 参考博客:http://blog.csdn.net/napoleon_acm/article/details/40020297 题意:给定n*m的空棋盘 每一次在上面选择一个空的位置放置一枚棋子,直至每一行每一列都至少有一个棋子,求放置次数的期望 分析: dp[i][j][k] 表示当前用了<=k个chess ,覆盖了i行j列(i*j的格子 每行至少一个,每列至少一个)的概率. dp[i][j][k] 由 dp[i][j][k-1] , dp[i-1][j][k-1], dp[i][j…

一个n行m列的棋盘,每天可以放一个棋子,问要使得棋盘的每行每列都至少有一个棋子 需要的放棋子天数的期望. dp[i][j][k]表示用了k天棋子共能占领棋盘的i行j列的概率. 他的放置策略是,每放一次,就会有四种可能 1)增加一行一列 2)增加一行 3)增加一列 4)不变 所以他放置的概率就可以求出来,每次放下的概率就是当前能放的点除以总的空的点数. 最后统计期望的时候需要统计在第k天刚好符合占满n行m列的概率,就是dp[i][j][k]-dp[i][j][k-1] #include <cstd…

题目链接 题意: 给一个n*m的矩阵,每天随机的在未放棋子的格子上放一个棋子.求每行至少有一个棋子,每列至少有一个棋子的天数的期望  (1 <= N, M <= 50). 分析: 比較明显的概率DP,难点在于怎样设计状态.覆盖了多少行和列是不可缺少的,之后比較关键的就是想到还有一个属性:多少个交叉点(即放过的点) double dp[55][55][2550]; bool vis[55][55][2550]; int tot; int n, m; inline double getp(int…

题意: 一个棋盘假设每行每列都有棋子那么这个棋盘达到目标状态  如今随机放棋子  问达到目标状态的期望步数 思路: 用概率来做  计算第k步达到目标状态的概率  进而求期望  概率计算方法就是dp  dp[k][i][j]表示第k步有i行被覆盖j列被覆盖  转移仅仅有4种  -- 同一时候覆盖行列  覆盖行  覆盖列  不覆盖  状态数50^4  非常easy 代码: #include<cstdio> #include<iostream> #include<cstring&g…

题意: 给N×M的棋盘.每天随机找一个没放过棋子的格子放一个棋子 问使得每一个每列都有棋子的天数期望 思路: dp[i][j][k] 代表放了i个棋子占了j行k列 到达目标状态的期望 然后从 dp[n*m][n][m] 往后递推就好了. 由于知道了有i个棋子 比如一个状态dp[6][3][3] x x x o o o x o o o o o x o x o o o o o o o o o 对于 dp[i+1][3][3] 事实上就是3*3剩下的空再放一个,概率就是(j*k-i) / (n*m-i…

题目链接:problemId=5376">http://acm.zju.edu.cn/onlinejudge/showProblem.do?problemId=5376 Edward is the headmaster of Marjar University. He is enthusiastic about chess and often plays chess with his friends. What's more, he bought a large decorative ch…

///dp[i][j][k]代表i行j列件,并把一k的概率 ///dp[i][j][k]一种常见的方法有四种传输 ///1:dp[i-1][j][k-1] 可能 (n-(i-1))*j/(n*m-(k-1)) ///2:dp[i][j-1][k-1] 概率为 i*(m-(j-1))/(n*m-(k-1)) ///3:dp[i-1][j-1][k-1] 概率为 (n-(i-1))*(m-(j-1))/(n*m-(k-1)) ///4:dp[i][j][k-1] 概率为 (i*j-(k-1))/(n…

Edward is the headmaster of Marjar University. He is enthusiastic about chess and often plays chess with his friends. What's more, he bought a large decorative chessboard with N rows and M columns. Every day after work, Edward will place a chess piec…

Description Edward is the headmaster of Marjar University. He is enthusiastic about chess and often plays chess with his friends. What's more, he bought a large decorative chessboard with N rows and M columns. Every day after work, Edward will place…

题目链接 #include <bits/stdc++.h> using namespace std; typedef long long ll; inline ll read(){ , f = ; char ch = getchar(); ; ch = getchar();} +ch-'; ch = getchar();} return x*f; } /***********************************************************************…

一个n行m列的棋盘,每次能够放一个棋子.问要使得棋盘的每行每列都至少有一个棋子 须要的放棋子次数的期望. dp[i][j][k]表示用了k个棋子共能占据棋盘的i行j列的概率. 那么对于每一颗棋子,在现有的棋盘上,它可能有四种影响:新占了一行,新占了一列,既占了新的一行又占了新的一列.无影响. 对于每一种情况.dp[i][j][k]=原始状态的概率×选到这种位置的概率 最后算答案的时候注意到,题目问的是到第k个刚好放完n行m列.也就是最后一个棋子一定是有作用的, 所以用dp[i][j][k]-dp…

题意:https://zoj.pintia.cn/problem-sets/91827364500/problems/91827369874 给你n*m的棋盘,我们定义放满棋盘是:任意一行一列至少有一个棋子. 问你放满棋盘需要棋子的期望数. 思路: 我们先算出用x个棋子放满棋盘的概率,然后求Sigma就可以了 我们可以转换一下放棋子的方式,在任意一个地方放棋子,我们都可以把这个位置尽可能的移到左上角. dp[k][i][j]是放了k个棋子,已经有 i 行 j 列满了的概率: 注意:放最后一个的时…

如果一个红石头在另一个红石头的左下方(包括左和下),那么在后者的限制满足时,前者也一定满足,因此可以删去前者,再将其按照$rx_{i}$排序,即有$rx_{1}<rx_{2}<...<rx_{n}$且$ry_{1}>ry_{2}>...>ry_{n}$ 称一个蓝石头覆盖一个红石头当且今当后者在前者的左下方(包括左和下),若一个蓝石头在$(x,y)$,要使其覆盖区间$[l,r]$的红石头,所需代价即$\max(rx_{r}-x,0)+\max(ry_{l}-y,0)$ 下…

原文: http://chris.beams.io/posts/git-commit/ 介绍:为什么好的commit message很重要 你浏览项目commit message的时候或多或少会有些困扰的地方. 例如, 下面是我早前的commit message: $ git log --oneline -5 --author cbeams --before "Fri Mar 26 2009" e5f4b49 Re-adding ConfigurationPostProcessorTe…

第一节 - 一般性问题 1. 为什么有些时候使用“GNU/Linux"而另一些时候使用“Linux”? 答:在这个FAQ中,我们尝试使用“linux”或者“linux kernel”来表示内核,而GNU/Linux用于表示整个GNU/GPL的操作系统软件.我们需要分清:) FAQ的目的是提供linux内核更多的信息并避免语义上的歧义.更多GNU软件和linux关系的讨论可以在http://www.gnu.org/gnu/linux-and-gnu.html获取.看上去很多人都忽视了linux内核…

1, The lawsuit is very much o the lawyer's mind. 2, The canteen was absolutely packed. 3, Doctors diagnose before they prescribe a drug. 4, Not only did the rocket solve a problem that had intrigued man for ages, but more importantly, it literally op…