题目链接 题意: 两个人坐火车, 在某个城市到站的时间段分别为[t1, t2] , [s1, s2],停在站台的时间均为w. 问, 若两人能见面的概率. 思路: 一道基础的几何概型, p = s(m)/s(n). 令x1 = t1, x2 = t2. 令y1 = s1, y2 = s2. 这样这四条直线就围成一个矩形,若两人见面, 则应该满足在 y = x ± w 这两条直线之间. 即本题求解, y = x ± w 在矩形中所围面积 与矩形面积之比. 根据 y = x + b 这条线与矩形的交点…

几何概型,<训练指南>的题.分类讨论太神啦我不会,我只会萌萌哒的simpson强上~这里用正方形在y=x-w的左上方的面积减去在y=x+w左上方的面积就是两条直线之间的面积,然后切出来的每一小段肯定是梯形或三角形,所以可以写得和一般的Simpson有点区别. #include<cstdio> ; int a1,a2,b1,b2,w; double f1(double x){ if(x+w<=b1)return b2-b1; ; } double f2(double x){ i…

转载自:https://ilmatte.wordpress.com/2013/01/06/entity-framework-joining-in-memory-data-with-dbset/ The argument of this post is relevant to people using Entity Framework and needing to filter data coming from a Database with a list of in-memory data. I…

11722 - Joining with Friend You are going from Dhaka to Chittagong by train and you came to know one of your old friends is goingfrom city Chittagong to Sylhet. You also know that both the trains will have a stoppage at junctionAkhaura at almost same…

题目连接:uva 11722 - Joining with Friend 题目大意:你和朋友乘火车,而且都会路过A市.给定两人可能到达A市的时段,火车会停w.问说两人能够见面的概率. 解题思路:y = x + w 和y = x - w在给定时间内围成的面积除以时间的总面积,就是求面积的时候要分情况处理. #include <cstdio> #include <cstring> #include <algorithm> using namespace std; int t…

How to quickly become effective when joining a new company The other day my colleague Richard asked me how I managed to get started at Lumi quite so quickly. It's a good question. When I started here I was pretty much doing useful work from my second…

文章标题 Apache Spark as a Compiler: Joining a Billion Rows per Second on a Laptop Deep dive into the new Tungsten execution engine 作者介绍 Sameer Agarwal, Davies Liu and Reynold Xin 文章正文 参考文献 https://databricks.com/blog/2016/05/23/apache-spark-as-a-compile…

Joining IEnumerable<TOuter>, IEnumerable<TInner>→IEnumerable<TResult> Operator 说明 SQL语义 Join 应用一种查询策略来匹配两个集合中的元素,产生一个平展的结果集 INNER JOIN GroupJoin 同上,但是产生一个层次结果集 INNER   JOIN, LEFT   OUTER JOIN Join & GroupJoin Arguments 参数 类型 外层/Outer…

SQL 基础学习(2) Joining 可以同时关联(joining)多张表进行复杂的查询. 相比于用Rails捞出数据再用Ruby进行过滤组合,使用SQL更加高效,节能. 以下是 users has_many events的情景,打开DB Browser for SQLite 并新建一个文件demo2.db. 在terminal中执行sqlite3 demo2.db CREATE TABLE events (id INTEGER NOT NULL PRIMARY KEY AUTOINCREME…

                        Joining with Friend You are going from Dhaka to Chittagong by train and you came to know one of your old friends is goingfrom city Chittagong to Sylhet. You also know that both the trains will have a stoppage at junctionAkhaur…