http://acm.split.hdu.edu.cn/showproblem.php?pid=4336 Card Collector Special Judge Problem Description   In your childhood, do you crazy for collecting the beautiful cards in the snacks? They said that, for example, if you collect all the 108 people i…

=============================以下是最小生成树+并查集====================================== [HDU] How Many Tables 基础并查集★ 小希的迷宫 基础并查集★ &&poj1308 Is It A Tree? 基础并查集★ More is better 基础并查集★ Constructing Roads 基础最小生成树★ 畅通工程 基础并查集★ 还是畅通工程 基础最小生成树★ 畅通工程 基础最小生成树★ 畅通…

以下资料来自:http://blog.csdn.net/Dinosoft/article/details/6795700 http://qianmacao.blog.163.com/blog/static/203397180201222945212647/ http://blog.csdn.net/qinmusiyan/article/details/7950642# HDU 1850 Being a Good Boy in Spring Festival   下面是一个二人小游戏:桌子上有M堆…

In your childhood, do you crazy for collecting the beautiful cards in the snacks? They said that, for example, if you collect all the 108 people in the famous novel Water Margin, you will win an amazing award. As a smart boy, you notice that to win t…

Card Collector Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 3407    Accepted Submission(s): 1665Special Judge Problem Description In your childhood, do you crazy for collecting the beautiful…

[HDU4336]Card Collector(Min-Max容斥) 题面 Vjudge 题解 原来似乎写过一种状压的做法,然后空间复杂度很不优秀. 今天来补一种神奇的方法. 给定集合\(S\),设\(max\{S\}\)为\(S\)中的最大值,\(min\{S\}\)为集合\(S\)中的最小值. 那么我们可以得到: \(max\{S\}=\sum_{T\subseteq S}(-1)^{|T|+1}min\{T\}\) 证明的话,大概就是如果你钦定一个最小值,并且它强制出现, 如果枚举所有子集…

[HDU4336]Card Collector (动态规划,数学期望) 题面 Vjudge 题解 设\(f[i]\)表示状态\(i\)到达目标状态的期望 \(f[i]=(\sum f[j]*p[j]+1)/(\sum p[j])\) 直接枚举一下即可 #include<cstdio> int n; float f[1<<20],p[20]; int main() { while(scanf("%d",&n)!=EOF) { for(int i=0;i&l…

[BZOJ4391][Usaco2015 dec]High Card Low Card(贪心) 题面 BZOJ 题解 预处理前缀后缀的结果,中间找个地方合并就好了. #include<iostream> #include<cstdio> #include<cstdlib> #include<cstring> #include<cmath> #include<algorithm> #include<set> using na…

[HDOJ 5379] Mahjong tree 往一颗树上标号 要求同一父亲节点的节点们标号连续 同一子树的节点们标号连续 问一共同拥有几种标法 画了一画 发现标号有二叉树的感觉 初始标号1~n 根结点1能够标1或n 否则其它情况无法让以下的子树满足各自连续而且该根的儿子节点都要连续 根结点下的节点平分其它标号 画一画能够发现 每一个根下最多有两颗子树 否则无法满足条件 而且两颗子树占领剩余标号的左右两边 中间夹的必须是叶子 这样才干满足该根下的儿子节点标号连续 若根下仅仅有一颗子树 相同能够…

HDOJ 1238 Substrings [最长公共子串] Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 11430 Accepted Submission(s): 5490 Problem Description You are given a number of case-sensitive strings of alphabetic…