hackerrankWeek of Code 31 A.Beautiful Word B.Accurate Sorting C.Zero-One Game D.Spanning Tree Fraction E.Colliding Circles F.Nominating Group Leaders G.Split Plane…

hackerrankWeek of Code 32 A.Duplication B.Fight the Monsters! C.Circular Walk D.Geometric Trick E.Balls and Boxes F.Special Substrings…

https://www.hackerrank.com/contests/w31/challenges/colliding-circles/problem 设E(n)为序列长度为n时的期望值. \[ \begin{aligned} E(n-1)=&E(n)+\frac1{n\choose2}\sum_{0\leq i<j\leq n}2r_ir_j\\ =&E(n)+\frac1{n\choose2}\left[\left(\sum r_i\right)^2-\sum r_i^2\ri…

https://www.hackerrank.com/contests/w31/challenges Beautiful Word 模拟 Accurate Sorting 检查每个数字距离原位是否都不超过1 Zero-One Game 计算可以被删去的数字个数 Spanning Tree Fraction 最优比率生成树,分数规划+Kruscal Colliding Circles 算出两两圆之间最后被合并的概率,由期望的线性性计算对答案的贡献 #include<bits/stdc++.h>…

经常遇到的exception是: 1. PipeMapRed.waitOutputThreads(): subprocess failed with code N  ............ 2. Task process exit with nonzero status of  N ............ java.lang.Throwable: Child Errorat org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:271…

PipeMapRed.waitOutputThreads(): subprocess failed with code X ,这里code X对应的信息如下:error code 1: Operation not permittederror code 2: No such file or directoryerror code 3: No such processerror code 4: Interrupted system callerror code 5: Input/output er…

原文传送门:http://www.2cto.com/database/201308/236519.html "OS error code 1: Operation not permitted" "OS error code 2: No such file or directory" "OS error code 3: No such process" "OS error code 4: Interrupted system call&q…

1. Coding iOS 客户端 Coding官方客户端. 笔者强烈推荐的值得学习的完整APP.GitHub - Coding/Coding-iOS: Coding iOS 客户端源代码 2. OSCHINA 的 iPhone 客户端开源中国的iPhone客户端源码https://git.oschina.net/oschina/iphone-app 3. Git@OSC Git@OSC iPhone 客户端,方便用户查看Git@OSC的项目以及简单的操作issue等oschina / git-…

  首先,来看一个简单的JAVA类,Base. 1 public class Base { 2 String str = "Base string"; 3 protected void show( ){ 4 System.out.println(str); 5 init(); 6 } 7 protected void init(){ 8 System.out.println("Base init"); 9 } 10 } 然后,从Base类中派生一个子类Sub.并且在…

转自:http://blog.chinaunix.net/uid-10347480-id-3263127.html 在 Linux 下,不管你是启动一个桌面程序也好,还是在控制台下运行命令,所有的程序在结束时,都会返回一个数字值,这个值叫做返回值,或者称为错误号 ( Error Number ). 在控制台下,有一个特殊的环境变量 $ ls *.pngDiagram1.png  eqn.png         peazip.pngeqn4.png      Mandelbrot.png  x2.…