Given two variables, x and y, swap two variables without using a third variable.   Example Given x = 10, y = 5Return 15. 思路:考察位运算,异或. 同一个数异或两次还是其本身. class Solution { public: /** * @param x an integer * @param y an integer * @return nothing */ void sw…

本系列文章由 @YhL_Leo 出品,转载请注明出处. 文章链接: http://blog.csdn.net/yhl_leo/article/details/50255379 对于可以线性运算的变量,交换两个变量值的做法,通常我们是这样的: /** * Swap the parameters with a temp variable. * @param a The first parameter. * @param a The second parameter. */ void swap(int…

批量梯度下降的逻辑回归可以参考这篇文章:http://blog.csdn.net/pakko/article/details/37878837 看了一些Scala语法后,打算看看MlLib的机器学习算法的并行化,那就是逻辑回归,找到package org.apache.spark.mllib.classification下的LogisticRegressionWithSGD这个类,直接搜train()函数. def train( input: RDD[LabeledPoint], numIter…

最近在研究机器学习,使用的工具是spark,本文是针对spar最新的源码Spark1.6.0的MLlib中的logistic regression, linear regression进行源码分析,其理论部分参考:http://www.cnblogs.com/ljy2013/p/5129610.html 下面我们跟随我的demo来一步一步解剖源码,首先来看一下我的demo: package org.apache.spark.mllib.classification import org.apac…

Write a program to print a histogram of the lengths of words in its input. It is easy to draw the histogram with the bars horizontal; a vertical orientation is more challenging. 统计输入中单词的长度,并且绘制相应的直方图.水平的直方图比较容易绘制,垂直的直方图较困难一些. /* This program was the…

1. Bubble Sort public void bubbleSort(int[] arr) { boolean swapped = true; int j = 0; int tmp; while (swapped) { swapped = false; j++; for (int i = 0; i < arr.length - j; i++) { if (arr[i] > arr[i + 1]) { tmp = arr[i]; arr[i] = arr[i + 1]; arr[i + 1…

1.图类基本组成 存储在邻接表中的基本项 /** * Represents an edge in the graph * */ class Edge implements Comparable<Edge> { public Vertex dest; //Second vertex in Edge public double cost; //Edge cost public Edge(Vertex d, double c) { dest = d; cost = c; } @Override pu…

第一部分: For-each Loop Purpose The basic for loop was extended in Java5 to make iteration over arrays and other collections more convenient. This newer for statement is called the enhanced for or for-each (because it is called this in other programming…

/** * :: DeveloperApi :: * GeneralizedLinearModel (GLM) represents a model trained using * GeneralizedLinearAlgorithm. GLMs consist of a weight vector and * an intercept. * * @param weights Weights computed for every feature. * @param intercept Inter…

A subarray A[i], A[i+1], ..., A[j] of A is said to be turbulent if and only if: For i <= k < j, A[k] > A[k+1] when k is odd, and A[k] < A[k+1] when k is even; OR, for i <= k < j, A[k] > A[k+1] when k is even, and A[k] < A[k+1] when…

/** Improve you loop code */ var treasureChest = { goldCoins: 10000, magicalItem : "Crown of Speed", necklaces: ["ruby", "pearl", "sapphire", "diamond"], openLid: function(){ alert("openLid"); }…

第二周课程的Elementray Sorts部分练习测验Interview Questions的第3题荷兰国旗问题很有意思.题目的原文描述如下: Dutch national flag. Given an array of n buckets, each containing a red, white, or blue pebble, sort them by color. The allowed operations are: swap(i,j): swap the pebble in buc…

1.理论基础 线性回归(Linear Regression)问题属于监督学习(Supervised Learning)范畴,又称分类(Classification)或归纳学习(Inductive Learning);这类分析中训练数据集中给出的数据类标是确定的.机器学习的目标是,对于给定的一个训练数据集,通过不断的分析和学习产生一个联系属性集合和类标集合的分类函数(Classification Function)或预測函数(Prediction Function),这个函数称为分类模型(Clas…

一.实现方法流程图 流程图如下:代码托管在本地GitLab上(为了复现整套流水线,我直接使用了GitHub,懒得再搭建GitLab),开发完成后提交代码到代码仓库,[自动]触发Jenkins进行持续集成和部署,如果代码出现问题,根据版本进行回滚.(1).自动触发Jenkins可以使用hooks来实现,具体是否使用取决于自己:(2).Jenkins从GitLab上拉取代码进行编译打包,并将项目target目录备份到备份目录下,以便回滚使用:(3).Jenkins将打好得包通过ansible部署到对…

use sentinel to avoid boudary testing, use swap trick to avoid extra copy. original version #include <cstdio> #include <algorithm> int main() { //freopen("input.txt","r",stdin); const int MAXSIZE=22, dimSize=20; int bacnums…

文章著作权归作者所有.转载请联系作者,并在文中注明出处,给出原文链接. 本系列原更新于作者的github博客,这里给出链接. 在我们使用Cg或者HLSL进行shader编写的过程中,常常涉及到一些变量类型的使用,其中数字类型有三种最基础的变量类型:float,half,fixed,由此延伸出的还有向量类型以及矩阵类型,如:float3,half4x4.虽然都是表示数字,但它们之间的差别还是应该清楚,而不是遇到数据就无脑地使用float. float: high precision floatin…

http://www.cs.utsa.edu/~wagner/CS2213/swap/swap.html 原地址 Parameters, by value and by reference: Both C and Java use only parameters that pass by value, which means that the value of the actual parameter is used to initialize the formal parameter. For…

在查容器内部资源利用情况时候,发现top命令无法使用,报错“TERM environment variable not set.”.从网上找到了解决方案,如下. [root@localhost ~]# docker exec -ti redis /bin/bash [root@9bf53a30e849 /]# top TERM environment variable not set. [root@9bf53a30e849 /]# echo $TERM dumb [root@9bf53a30e8…

传送门 今天在HackerRank上翻到一道高精度题,于是乎就写了个高精度的模板,说是模板其实就只有乘法而已. Extra long factorials Authored by vatsalchanana on Jun 16 2015 Problem Statement You are given an integer N. Print the factorial of this number. N!=N×(N−1)×(N−2)×⋯×3×2×1 Note: Factorials of N>20…

然而今天在使用 SELECT INTO FROM 备份mysql数据表的时候,运行相关 sql 语句的时候却一直返回 [Err] 1327 - Undeclared variable: ...... 这种错误,实在不解,经过查询相关资料才知道,原来 mysql 数据库是不支持 SELECT INTO FROM 这种语句的,但是经过研究是可以通过另外一种变通的方法解决这个问题的,下面就来说说解决这个错误的辦法吧! mysql> select user,host into user2 from us…

一．SWAP 说明 1.SWAP 概述 当系统的物理内存不够用的时候,就需要将物理内存中的一部分空间释放出来,以供当前运行的程序使用.那些被释放的空间可能来自一些很长时间没有什么操作的程序,这些被释放的空间被临时保存到Swap空间中,等到那些程序要运行时,再从Swap中恢复保存的数据到内存中.这样,系统总是在物理内存不够时,才进行Swap交换. 以上是SWAP 交换分区的作用. 实际上,我们更关注的应该是SWAP分区的大小问题. 设置多大才是最优的.一般来说可以按照如下规则设置swap大小: 4…

Creating a Swap Partition 1.   Use  fdisk /dev/vda  to open your disk in fdisk. (Use gdisk if you are using a disk with a GUID partition table.) 2.   Press  n  to add a new partition. Specify start and stop cylinders and size. 3.   Type  t  to change…

处理交换文件和分区 交换分区是系统RAM 的补充 基本设置包括: 创建交换分区或者文件 使用mkswap 写入特殊签名 在/etc/fstab 文件中添加适当的条目 使用swapon -a 挂载交换分区 启用:swapon swapon [OPTION]... [DEVICE] -a :激活所有的交换分区: -p PRIORITY :指定优先级 /etc/fstab:pri=value 禁用:swapoff [OPTION]... [DEVICE] [root@station29 ~]# lsb…

free [root@localhost ~]# free total used free shared buff/cache available Mem: 999936 142760 566536 6884 290640 672076 Swap: 2097148 0 2097148 [root@localhost ~]# free -h total used free shared buff/cache available Mem: 976M 139M 553M 6.7M 283M 656M…

Find the contiguous subarray within an array (containing at least one number) which has the largest product. For example, given the array [2,3,-2,4], the contiguous subarray [2,3] has the largest product = 6. Idea: https://leetcode.com/problems/maxim…

Given a linked list, swap every two adjacent nodes and return its head. Example: Given 1->2->3->4, you should return the list as 2->1->4->3. Note: Your algorithm should use only constant extra space. You may not modify the values in the…

［抄题］: Given a linked list, swap every two adjacent nodes and return its head. Example: Given 1->2->3->4, you should return the list as 2->1->4->3. Note: Your algorithm should use only constant extra space. You may not modify the values i…

Question: I know references are syntactic sugar, so code is easier to read and write. But what are the differences? Summary from answers and links below: A pointer can be re-assigned any number of times while a reference can not be re-seated after bi…

leetcode-algorithms-24 Swap Nodes in Pairs Given a linked list, swap every two adjacent nodes and return its head. Example: Given 1->2->3->4, you should return the list as 2->1->4->3. Note: Your algorithm should use only constant extra s…

转载 2014年04月26日 14:41:15 4470 由于工作需要,要帮助同事查看linux服务器的缓存开启情况,经过查找资料,可确定通过以下方法确定Linux磁盘缓存是否已开启. 1.命令行下执行free命令,当显示如下红框内的信息(swap)时,说明swap处于启用状态 此时注意,开启时total和free处均有值. 2.命令行下执行swapoff -a,关闭swap 3.此时执行free命令 此时注意,并闭时total和free处均为0,由此可知swap已经关闭. 4.附swapon.…