ZOJ 3822 可能性DP

【ZOJ 3822 可能性DP】的更多相关文章

http://acm.zju.edu.cn/onlinejudge/showProblem.do?problemCode=3822 本场比赛之前,我记得.见WALK概率路DP称号.那么它应该是可以考虑的概率DP,十一还特意看了碍着, 当场景.真的OUT了.然后好激动的样子,開始推得二维.然后感觉好难推.发现n仅仅有50.所以就去推三维,然后发现k<max(i,j)的时候,有无用状态,无用状态初始化不会处理,然后认为好像也用不到,可是感觉更稳的还是去推二维,然后就陷入二维--------悲剧了 …

zoj 3822 Domination(dp)

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…

zoj 3822 概率dp

/* 题目大意:一个n*m的棋盘,每天放一个棋子,每行每列至少有一个棋子时结束.求达到每行每列至少有一个棋子的天数的数学期望. */ #include <iostream> #include <cstdio> #include <cstring> using namespace std; ; double dp[maxn*maxn][maxn][maxn];//放i颗棋子,j行有棋子,k列有棋子 int main() { int t,n,m,i,j,k; scanf(&…

[AC自己主动机+可能性dp] hdu 3689 Infinite monkey theorem

意甲冠军: 给n快报,和m频率. 然后进入n字母出现的概率然后给目标字符串str 然后问m概率倍的目标字符串是敲数量. 思维: AC自己主动机+可能性dp简单的问题. 首先建立trie图,然后就是状态转移了 dp版本号: dp三重循环变量次数,节点数,和字母数代码: #include"cstdlib" #include"cstdio" #include"cstring" #include"cmath" #include&q…

zoj 3822 Domination (可能性DP)

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…

zoj 3822（概率dp）

ZOJ Problem Set - 3822 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 lar…

ZOJ 3822 Domination 期望dp

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.…