https://www.hackerrank.com/contests/infinitum-aug14/challenges/jim-beam 学习了线段相交的判断法.首先是叉乘,叉乘的几何意义是有向的平行四边形的面积(除以2就是三角形的面积).如果ABD和ABC正负相反,说明C和D在AB两侧,同样的,再判断A和B是否在CD两侧即可.当某三角形面积为0时,需要判断是否在线段上. #include <iostream> using namespace std; typedef long long…

这里尽量为大家推荐一些符合大众喜好.业内公认好评."即使你不喜欢,你也会承认它不错"的酒款.而且介绍到的酒款还会有一个共同的特征,就是能让你方便的在网上买到. 大概会分为烈酒,利口酒,啤酒,和葡萄酒(红酒,白酒,起泡酒,甜酒)篇. 一.烈酒 烈酒篇里,我们要说的当然是世界六大烈酒(五大基酒加白兰地),也就是说,这几个大类的酒,已经能基本满足你的日常生活.客户交流.浪漫暧昧.补充酒精的需求了. 1.Gin(金酒) 100块以内的知名金酒,有Gordons哥顿金酒.Bombay Sapph…

1.概述 在本快速教程中,我们将学习如何设置Spring Security LDAP. 在我们开始之前,了解一下LDAP是什么? - 它代表轻量级目录访问协议.它是一种开放的,与供应商无关的协议,用于通过网络访问目录服务. 2. Maven Dependency 首先,让我们看看我们需要的maven依赖项: <dependency> <groupId>org.springframework.security</groupId> <artifactId>spr…

不多说,直接上干货! https://beam.apache.org/get-started/wordcount-example/ 来自官网的: The WordCount examples demonstrate how to set up a processing pipeline that can read text, tokenize the text lines into individual words, and perform a frequency count on each o…

找遍百度也没有找到关于Beam Search的详细解释,只有一些比较泛泛的讲解,于是有了这篇博文. 首先给出wiki地址:http://en.wikipedia.org/wiki/Beam_search 1.简介 Beam Search(集束搜索)是一种启发式图搜索算法,通常用在图的解空间比较大的情况下,为了减少搜索所占用的空间和时间,在每一步深度扩展的时候,剪掉一些质量比较差的结点,保留下一些质量较高的结点.这样减少了空间消耗,并提高了时间效率,但缺点就是有可能存在潜在的最佳方案被丢弃,因此B…

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…

Firt thought: an variation to LCS problem - but this one has many tricky detail. I learnt the solution from this link:https://github.com/wangyongliang/Algorithm/blob/master/hackerrank/Strings/Square%20Subsequences/main.cc And here is his code with my…

It is about how to choose btw. BFS and DFS. My init thought was to DFS - TLE\MLE. And its editorial gives a very neat BFS based idea which costs much less memory. https://www.hackerrank.com/challenges/beautiful-path/editorial…

It is marked as a NPC problem. However from the #1 code submission (https://www.hackerrank.com/CharlesOfria), it looks pretty much like a Brutal-Force (or simulation) based solution, mixed with some greedy strategies. To me the other NPC "Queens Revi…

Wiki定义:In computer science, beam search is a heuristic search algorithm that explores a graph by expanding the most promising node in a limited set. Beam search is an optimization of best-first search that reduces its memory requirements. Best-first…