[HackerRank]Choosing White Balls 题目大意: 有\(n(n\le30)\)个球排成一行,每个球的颜色为黑或白. 执行\(k\)次操作,第\(i\)次操作形式如下: 从\([1,n−i+1]\)中,等概率随机选择一个整数\(x\). 移除从左往右数的第\(x\)个球,或从右往左数的第\(x\)个球.之后,所有右侧的球的编号减\(1\). 给定每个球的颜色信息,求在最优策略下,期望的移除白球数量最大值. 思路: 状压DP+哈希表. 源代码: #include<cstd…

2063. Black and White Time limit: 1.0 secondMemory limit: 64 MB Let’s play a game. You are given a row of n balls, each ball is either black or white. Their positions in a row are numbered from 1 to n. You know the total number of balls n, but have n…

dp..dp(i, j)表示画两个点为i-j, i的最优答案. dp(i, j) = min{ dp(i-j, k) } + cost[i] (1≤k≤M-j) 令f(i, j) = min{dp(i, j)}, 那么转移时间下降为O(1).然后滚动数组..这道题卡空间..时间复杂度O(NM) -------------------------------------------------------------------------------- #include<cstdio> #in…

DZY Loves Balls Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others) Total Submission(s): 807    Accepted Submission(s): 439 Problem Description There are n black balls and m white balls in the big box. Now, DZY starts…

183. Painting the balls time limit per test: 0.25 sec.memory limit per test: 4096 KB input: standard inputoutput: standard output Petya puts the N white balls in a line and now he wants to paint some of them in black, so that at least two black balls…

B. Balls Game Time Limit: 1 Sec  Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/430/problem/B Description Iahub is training for the IOI. What is a better way to train than playing a Zuma-like game? There are n balls put in a row. Each ball i…

Description Petya puts the \(N\) white balls in a line and now he wants to paint some of them in black, so that at least two black balls could be found among any \(M\) successive balls. Petya knows that he needs \(C_i\) milliliters of dye exactly to…

PDF version PMF Suppose that a sample of size $n$ is to be chosen randomly (without replacement) from an urn containing $N$ balls, of which $m$ are white and $N-m$ are black. If we let $X$ denote the number of white balls selected, then $$f(x; N, m,…

Stat2.2x Probability(概率)课程由加州大学伯克利分校(University of California, Berkeley)于2014年在edX平台讲授. PDF笔记下载(Academia.edu) Summary Bayes Theorem $$P(A_i|B)=\frac{P(B|A_i)\cdot P(A_i)}{\sum_{j}P(B|A_j)\cdot P(A_j)}$$ where $$P(B)=\sum_{j}P(B|A_j)\cdot P(A_j)$$ GRA…

题 There are 2N white balls on a table in two rows, making a nice 2-by-N rectangle. Jon has a big paint bucketfull of black paint. (Don’t ask why.) He wants to paint all the balls black, but he would like to have somemath fun while doing it. (Again, d…

Ball Painting 题目连接: http://codeforces.com/gym/100015/attachments Description There are 2N white balls on a table in two rows, making a nice 2-by-N rectangle. Jon has a big paint bucket full of black paint. (Don't ask why.) He wants to paint all the b…

E - Sorted and Sorted Time limit : 2sec / Memory limit : 1024MB Score : 600 points Problem Statement There are 2N balls, N white and N black, arranged in a row. The integers from 1 through N are written on the white balls, one on each ball, and they…

题 There are 2N white balls on a table in two rows, making a nice 2-by-N rectangle. Jon has a big paint bucketfull of black paint. (Don’t ask why.) He wants to paint all the balls black, but he would like to have somemath fun while doing it. (Again, d…

DZY Loves Balls Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 860    Accepted Submission(s): 467 Problem Description There are n black balls and m white balls in the big box. Now, DZY starts t…

传送门 题目 There are 2N balls, N white and N black, arranged in a row. The integers from 1 through N are written on the white balls, one on each ball, and they are also written on the black balls, one on each ball. The integer written on the i-th ball fr…

6552: Ball Coloring 时间限制: 1 Sec  内存限制: 128 MB提交: 13  解决: 7[提交][状态][讨论版][命题人:admin] 题目描述 There are N bags, each containing two white balls. The i-th box contains two balls with integers xi and yi written on them, respectively.For each of these bags, y…

开篇:首先这本书的名字很霸气,全书内容讲的是R语言在机器学习上面的应用,一些基本的分类算法(tree,SVM,NB),回归算法,智能优化算法,维度约减等,机器学习领域已经有很多成熟的R工具箱,毕竟这个领域被统计学称霸了十多年,常用R工具箱都可以在这里面找到http://www.rdatamining.com/docs,http://www.mloss.org/software/ 本书第一张介绍了R以及相应包的安装,同时拿了UFO数据集进行练手,数据集以及源码网上都有的 首先加载数据集(博客园的插…

E - Ball Coloring Time limit : 2sec / Memory limit : 256MB Score : 700 points Problem Statement There are N bags, each containing two white balls. The i-th box contains two balls with integers xi and yi written on them, respectively. For each of thes…

最近总是有需要单独对某一个类型的通路进行超几何分布的p值计算,这里记录一下python包的计算方法 使用scipy的stat里面的hypergeom.sf方法进行富集分析的p值计算 hsaxxxxx AA and Linoleic metabolism KEGG pathways Pathways KEGG (Homo sapiens (human)) 59 17 3586 141 3.32E-11 ------------ set in set background in background…

原文链接https://www.cnblogs.com/zhouzhendong/p/CF264C.html 题目传送门 - CF264C 题意 给定一个有 $n$ 个元素的序列,序列的每一个元素是个球,第 $i$ 个球具有 $v_i$ 的值,颜色为 $c_i$ . 一个序列的价值为每一个球价值和. 在一个序列中,第 $i$ 个球的价值为: 当 $c_i=c_{i-1}(i>1)$ 时,$value=a\times v_i$. 否则, $value=b\times v_i$ . 接下来有 $q$…

lightOJ  1317  Throwing Balls into the Baskets(期望)  解题报告 题目链接:http://acm.hust.edu.cn/vjudge/contest/view.action?cid=88890#problem/A 题目: Description You probably have played the game "Throwing Balls into the Basket". It is a simple game. You have…

  Choosing a Color Space 选择色彩空间 In addition to selecting a rendering path, it’s important to choose a ‘Color Space’ before lighting your project. Color Space determines the maths used by Unity when mixing colors in lighting calculations or reading va…

D. Choosing Capital for Treeland time limit per test 3 seconds memory limit per test 256 megabytes input standard input output standard output The country Treeland consists of n cities, some pairs of them are connected with unidirectional roads. Over…

C. Kyoya and Colored Balls Time Limit: 2000ms Memory Limit: 262144KB 64-bit integer IO format: %I64d      Java class name: (Any) Submit Status Kyoya Ootori has a bag with n colored balls that are colored with k different colors. The colors are labele…

题目传送门:https://www.hackerrank.com/challenges/unique-colors 感谢hzq大神找来的这道题. 考虑点分治(毕竟是路经统计),对于每一个颜色,它的贡献是独立的.我们可以在一次点分治中合在一块处理(为什么时间复杂度是对的呢,因为我们每次改动只会根据当前点的颜色进行变动,而不是所有颜色对着它都来一遍).每次先对重心单独计算答案贡献,此时也将当前区域的各个答案贡献计算出来,并以此为基础(之后称之为基准贡献,即代码中的tot).对于每一棵子树,我们先df…

Matlab expects images of type double to be in the 0..1 range and images that are uint8 in the 0..255 range. You can convert the range yourself (but change values in the process), do an explicit cast (and potentially loose precision) or instruct Matla…

今天讨论的是称球问题. No.3 13 balls problem You are given 13 balls. The odd ball may be either heavier or lighter. Find out the odd ball in 3 weightings. 分析与解答: 看到这道题,就想起来高中时候数学老师的一句话:“真正难的题不是那些很长的题,而是那些就几句话的题!!!”现在想想真是良训啊.又想到很多老师的话,感觉到失去方显弥足珍贵的名言,不禁唏嘘啊…… 有人认为…

本书转译自日文,日文版则是在美国的“Choosing Wisely”项目中选择了100个相对常见的过度医疗项目做解说.Choosing Wisely项目,是由美国多个专业医学组织发起的列出过度医疗项目的活动. 日文作者是兽医专业的新闻记者,中文译者不是医学专业人员,个别专业词语翻译有误,“随机对照试验”翻译成“随机比较试验”了,有些句子翻译的也比较别扭.基于以上两点,这本书的权威性可信度我认为都不算太高,只能给三星.感兴趣的话还是应该直接上网看英文原版. 以下是书中部分信息的摘抄: 1:以美国内…

C16H:Magical Balls 总时间限制:  1000ms 内存限制:  262144kB 描述 Wenwen has a magical ball. When put on an infinite plane, it will keep duplicating itself forever. Initially, Wenwen puts the ball on the location (x0, y0) of the plane. Then the ball starts to dup…

This blog will be talking about the color image converted to black and white picture. The project structure as follow: The run result: ========================================================== source code: ===========================================…