Life Long Programmer's Community Log: 2015-01-04

电子书：初等算法 - 博客 - 伯乐在线算法书籍汗牛充栋，《算法导论》，《计算机程序设计艺术》，《计算机程序的构造和解释》……，为什么要写这么一本书？是不是重复发明轮子？这本书的特点有以下几个：...

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电子书：初等算法 - 博客 - 伯乐在线

算法书籍汗牛充栋，《算法导论》，《计算机程序设计艺术》，《计算机程序的构造和解释》……，为什么要写这么一本书？是不是重复发明轮子？

这本书的特点有以下几个：

1、形式化。所有的算法都尽量形式化为数学公式，同时给出伪代码。我希望能够让算法回归数学，具有代数符号般的简洁和优美；

2、函数化和 imperative 对照。几乎所有的算法都同时给出了传统的 imperative 实现和纯函数实现。

3、多语言。尽量给出了多种语言的实现，包括C, Haskell, Python, C++， Scheme/Lisp 等。

4、尽量手绘插图，儿童画风格。

归并排序的插画

跳跃青蛙问题的插画

狼、羊、白菜过河问题的插画

选择排序的插画

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Done

电子书：初等算法 - 博客 - 伯乐在线

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Great Algorithms that Revolutionized Computing - Docsity.com http://ift.tt/1KxohF0...

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Great Algorithms that Revolutionized Computing - Docsity.com

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Great Algorithms that Revolutionized Computing - Docsity.com

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When Random Isn't Random Enough: Lessons from an Online Poker Exploit - Laura Diane Hamilton http://...

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When Random Isn't Random Enough: Lessons from an Online Poker Exploit - Laura Diane Hamilton

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When Random Isn't Random Enough: Lessons from an Online Poker Exploit - Laura Diane Hamilton

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algorithm - Pair socks from a pile efficiently? - Stack Overflow Given a pile of n pairs of socks, ...

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algorithm - Pair socks from a pile efficiently? - Stack Overflow

Given a pile of n pairs of socks, containing 2n elements (assume each sock has exactly one matching pair), what is the best way to pair them up efficiently with up to logarithmic extra space? (I believe I can remember that amount of info if needed.)

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Done

algorithm - Pair socks from a pile efficiently? - Stack Overflow

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The real 10 algorithms that dominate our world — Medium http://ift.tt/1Kxohog...

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The real 10 algorithms that dominate our world — Medium

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The real 10 algorithms that dominate our world — Medium

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Beating the binary search algorithm – interpolation search, galloping search http://ift.tt/1yRbdXg...

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Beating the binary search algorithm – interpolation search, galloping search

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Beating the binary search algorithm – interpolation search, galloping search

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Everyday Algorithms: Elevator Allocation Austin G. Walters There are ten floors, each with the same...

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Everyday Algorithms: Elevator Allocation Austin G. Walters

There are ten floors, each with the same number of people living on each floor. There are three elevators and no stairs. How would you allocate the elevators for optimal(ish) performance, minimizing waiting time for each floor?

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Done

Everyday Algorithms: Elevator Allocation Austin G. Walters

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相似图片搜索的原理（二） - 阮一峰的网络日志 http://ift.tt/16pG0cd

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相似图片搜索的原理（二） - 阮一峰的网络日志

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相似图片搜索的原理（二） - 阮一峰的网络日志

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How Reddit ranking algorithms work - amix.dk http://ift.tt/zeFbpj

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How Reddit ranking algorithms work - amix.dk

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How Reddit ranking algorithms work - amix.dk

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基于用户投票的排名算法（三）：Stack Overflow - 阮一峰的网络日志 http://ift.tt/1yRbf1d...

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基于用户投票的排名算法（三）：Stack Overflow - 阮一峰的网络日志

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基于用户投票的排名算法（三）：Stack Overflow - 阮一峰的网络日志

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Binary Sort http://ift.tt/1yRbd9G

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Binary Sort

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Binary Sort

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Stas's blog: All you need to know about QuickSort http://ift.tt/1AZ5D4z...

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Stas's blog: All you need to know about QuickSort

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Stas's blog: All you need to know about QuickSort

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(16) What are the 10 must-know algorithms and data structures for a software engineer? - Quora http:...

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(16) What are the 10 must-know algorithms and data structures for a software engineer? - Quora

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(16) What are the 10 must-know algorithms and data structures for a software engineer? - Quora

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Changing Bits: Apache Lucene™ 5.0.0 is coming! http://ift.tt/1DJX0dB...

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Changing Bits: Apache Lucene™ 5.0.0 is coming!

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Changing Bits: Apache Lucene™ 5.0.0 is coming!

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The BK-Tree – A Data Structure for Spell Checking | NullWords Blog To build a BK-Tree all you have ...

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The BK-Tree – A Data Structure for Spell Checking | NullWords Blog

To build a BK-Tree all you have to do is take any word from your set and plop it in as your root node, and then add words to the tree based on their distance to the root. For instance if I started a tree with the word set [book, books, cake] then my tree would look like this if I started by making the word book my root node:

Java Implementation:

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The BK-Tree – A Data Structure for Spell Checking | NullWords Blog

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Tom White: Consistent Hashing http://ift.tt/X1WkNV

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Tom White: Consistent Hashing

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Tom White: Consistent Hashing

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Java Collections - NavigableMap | tutorials.jenkov.com descendingKeySet() and descendingMap() (Link-...

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Java Collections - NavigableMap | tutorials.jenkov.com

descendingKeySet() and descendingMap() (Link->http://ift.tt/1BLzCgq)

headMap(), tailMap() and subMap() (Link->http://ift.tt/1I6QYq5)

ceilingKey(), floorKey(), higherKey() and lowerKey() (Link->http://ift.tt/1BLzI7I)

ceilingEntry(), floorEntry(), higherEntry() and lowerEntry() (Link->http://ift.tt/1I6QYq8)

pollFirstEntry() and pollLastEntry() (Link->http://ift.tt/1BLzCgs)

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Done

Java Collections - NavigableMap | tutorials.jenkov.com

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Consistent Hash Ring In consistent hashing, the servers, as well as the keys, are hashed, and it is...

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Consistent Hash Ring

In consistent hashing, the servers, as well as the keys, are hashed, and it is by this hash that they are looked up.

The hash space is large, and is treated as if it wraps around to form a circle - hence hash ring.

The process of creating a hash for each server is equivalent to placing it at a point on the circumference of this circle.

When a key needs to be looked up, it is hashed, which again corresponds to a point on the circle.

In order to find its server, one then simply moves round the circle clockwise from this point until the next server is found.

If no server is found from that point to end of the hash space, the first server is used - this is the "wrapping round" that makes the hash space circular.

The only remaining problem is that in practice hashing algorithms are likely to result in clusters of servers on the ring (or, to be more precise, some servers with a disproportionately large space before them), and this will result in greater load on the first server in the cluster and less on the remainder.

This can be ameliorated by adding each server to the ring a number of times in different places.

This is achieved by having a replica count, which applies to all servers in the ring, and when adding a server, looping from 0 to the count - 1, and hashing a string made from both the server and the loop variable to produce the position.

This has the effect of distributing the servers more evenly over the ring.

Note that this has nothing to do with server replication; each of the replicas represents the same physical server, and replication of data between servers is an entirely unrelated issue.

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Consistent Hash Ring

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GeoHash核心原理解析 - zhanlijun - 博客园 1）GeoHash将二维的经纬度转换成字符串，比如下图展示了北京9个区域的GeoHash字符串，分别是WX4ER，WX4G2、WX4G3...

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GeoHash核心原理解析 - zhanlijun - 博客园

1）GeoHash将二维的经纬度转换成字符串，比如下图展示了北京9个区域的GeoHash字符串，分别是WX4ER，WX4G2、WX4G3等等，每一个字符串代表了某一矩形区域。也就是说，这个矩形区域内所有的点（经纬度坐标）都共享相同的GeoHash字符串，这样既可以保护隐私（只表示大概区域位置而不是具体的点），又比较容易做缓存，比如左上角这个区域内的用户不断发送位置信息请求餐馆数据，由于这些用户的GeoHash字符串都是WX4ER，所以可以把WX4ER当作key，把该区域的餐馆信息当作value来进行缓存，而如果不使用GeoHash的话，由于区域内的用户传来的经纬度是各不相同的，很难做缓存。

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Done

GeoHash核心原理解析 - zhanlijun - 博客园

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Apache Storm Videos http://ift.tt/17qHRDs

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Apache Storm Videos

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Best of YouTube. Popular on YouTube · Music · Sports · Gaming · Education · Movies · TV Shows · News · Live · Spotlight · Browse channels. Sign in now to see your channels and recommendations! Sign In. Watch Queue. TV Queue. Watch QueueTV Queue. Remove all; Disconnect. Loading... Watch Queue ...

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How to Set Up Chrome OS' "Smart Unlock" (Or Unlock Chromebook When Your Phone is Nearby) - Chrome Story...

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How to Set Up Chrome OS' "Smart Unlock" (Or Unlock Chromebook When Your Phone is Nearby) - Chrome Story

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How to Set Up Chrome OS' "Smart Unlock" (Or Unlock Chromebook When Your Phone is Nearby) - Chrome Story

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Introduction to A* A* combines the two. Instead of contour lines showing distances from start or goal...

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Introduction to A*

A* combines the two. Instead of contour lines showing distances from start or goal, in A* the contour lines show the length of the paths. The inner region has the shortest paths. A* starts by exploring that inner region, and moves outwards only if it can’t find a path in there. Try drawing some walls to see how A* has to climb out of the innermost region to find a path.

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Introduction to A*

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Searching using A (A-Star)* http://ift.tt/1pBV6JM

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Searching using A (A-Star)*

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Searching using A* (A-Star)

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What's your most controversial programming opinion? http://ift.tt/1x1xg6B...

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What's your most controversial programming opinion?

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If you only know one language, no matter how well you know it, you’re not a great programmer.

寻找不同观点

千万别信自己的代码

十个让你变成糟糕的程序员的行为

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情绪化的思维

怀疑别人

程序员最大的问题就是“自负”，无论什么时候，什么情况下，有太多的机会会让这种“自负”澎涨开来，并开始影响团队影响整个项目，以至于听不见别人的建议，从而让Code Review变成了口水战。

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driving instead of waiting, leading instead of following.

Once a problem is described in sufficient detail, its solution is obvious.

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language agnostic - What's your most controversial programming opinion? - Stack Overflow http://stac...

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language agnostic - What's your most controversial programming opinion? - Stack Overflow

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language agnostic - What's your most controversial programming opinion? - Stack Overflow

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The Most Important Algorithms (Survey) http://ift.tt/1x1xfzF...

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The Most Important Algorithms (Survey)

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The Most Important Algorithms (Survey)

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Richard Feynman, the Challenger Disaster, and Software Engineering - Gustavo Duarte Engineering can ...

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Richard Feynman, the Challenger Disaster, and Software Engineering - Gustavo Duarte

Engineering can only be as good as its relationship with management Big design up front is foolish Software has much in common with other engineering disciplines Reliable systems are built by rigorously tested, incremental bottom-up engineering with an ‘attitude of highest quality’

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Done

Richard Feynman, the Challenger Disaster, and Software Engineering - Gustavo Duarte

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如何测试洗牌程序 | 酷壳 - CoolShell.cn http://ift.tt/Q6lvMR

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如何测试洗牌程序 | 酷壳 - CoolShell.cn

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如何测试洗牌程序 | 酷壳 - CoolShell.cn

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http://ift.tt/1IwRADI Done

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Done

http://ift.tt/1IwRADI

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水中的鱼: CodingTMD’s Reading List http://ift.tt/1x0fv7Y

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水中的鱼: CodingTMD’s Reading List

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水中的鱼: CodingTMD’s Reading List

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java - Radix sort vs Counting sort vs Bucket sort. What's the difference? - Stack Overflow Radix sort...

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java - Radix sort vs Counting sort vs Bucket sort. What's the difference? - Stack Overflow

Radix sort is sort based on this method. The problem with counting sort is memory requirement: int [] bucket=new int[maxVal+1];. Radix sort solves this problem. The idea is to use counting sort several times, first for lower digits, then for higher. For example, to sort 32-bit integers you might use:

sort(a, 65535) using lower half as key

sort(a, 65535) using higher half as key

It works, because counting sort is stable - it keeps order of data with equal keys. It's like sorting in spreadsheet: sort by B; sort by A gives you elements sorted by A, and by B when As are equal.

Bucket sort is a generalization of counting sort. You can use it to sort real numbers from some predictable probability distribution (eg. uniform (0,1)). The idea is to use counting sort (using floor(x*N_BUCKETS) as key) and then only sort each bucket independently.

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java - Radix sort vs Counting sort vs Bucket sort. What's the difference? - Stack Overflow

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Recursion and Concurrency - .NET Parallel Programming - Site Home - MSDN Blogs http://blogs.msdn.com...

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Recursion and Concurrency - .NET Parallel Programming - Site Home - MSDN Blogs

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Recursion and Concurrency - .NET Parallel Programming - Site Home - MSDN Blogs

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Recursion and Concurrency - .NET Parallel Programming - Site Home - MSDN Blogs http://blogs.msdn.com...

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Recursion and Concurrency - .NET Parallel Programming - Site Home - MSDN Blogs

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Recursion and Concurrency - .NET Parallel Programming - Site Home - MSDN Blogs

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ACM中的博弈问题 - GoodGame_fpcsong - 博客频道 - CSDN.NET http://ift.tt/1wuF7L1...

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ACM中的博弈问题 - GoodGame_fpcsong - 博客频道 - CSDN.NET

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ACM中的博弈问题 - GoodGame_fpcsong - 博客频道 - CSDN.NET

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How to add a date picker to a Google Spreadsheet | Mike Benny I have been looking for this for a long...

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How to add a date picker to a Google Spreadsheet | Mike Benny

I have been looking for this for a long time. I finally just Googled it…

“Right-click the selection you want to have the date picker show up for (i.e. single cell, entire row, entire column) and then open data validation. Set criteria to A valid date and click Save. Now just double-click the cell!” Here it is (Link->http://ift.tt/1Is36jM) !

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Done

How to add a date picker to a Google Spreadsheet | Mike Benny

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Sprague–Grundy theorem In nimber (Link->http://ift.tt/1DmD9Ea...

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Sprague–Grundy theorem

In nimber (Link->http://ift.tt/1DmD9Uo) . The Grundy value or nim-value of an impartial game is then defined as the unique nimber that the game is equivalent to. In the case of a game whose positions (or summands of positions) are indexed by the natural numbers (for example the possible heap sizes in nim-like games), the sequence of nimbers for successive heap sizes is called the nim-sequence of the game.

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Sprague–Grundy theorem

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Clone a specific Git branch - Stack Overflow git clone -b my-branch http://ift.tt/1HKvMpu...

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Clone a specific Git branch - Stack Overflow

git clone -b my-branch http://ift.tt/1KktDmL

With Git 1.7.10 and later, add --single-branch to prevent fetching of all branches. Example, with OpenCV 2.4 branch:

git clone -b 2.4 --single-branch http://ift.tt/1jCrzMq opencv-2.4

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Done

Clone a specific Git branch - Stack Overflow

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Running Apache Storm on Windows - P. Taylor Goetz http://ift.tt/1wmRqsN...

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Running Apache Storm on Windows - P. Taylor Goetz

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Running Apache Storm on Windows - P. Taylor Goetz

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Lucene.Net ultra fast search for MVC or WebForms site => made easy! - CodeProject http://ift.tt/ugMGUG...

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Lucene.Net ultra fast search for MVC or WebForms site => made easy! - CodeProject

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Lucene.Net ultra fast search for MVC or WebForms site => made easy! - CodeProject

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ChromeOS: Make Google Input tools work system wide Want to type chinese in chrome app in ChromeOS.

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ChromeOS: Make Google Input tools work system wide

Want to type chinese in chrome app in ChromeOS.

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What Is a DevOps Engineer? | Puppet Labs | Puppet Labs http://ift.tt/1fMtyHA...

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What Is a DevOps Engineer? | Puppet Labs | Puppet Labs

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What Is a DevOps Engineer? | Puppet Labs | Puppet Labs

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Scala School - Concurrency in Scala http://ift.tt/1wx0uKY

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Scala School - Concurrency in Scala

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Scala School - Concurrency in Scala

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Chrome on mobile: Option to open pages lazily or eagerly Chrome on mobile opens pages lazily: it will...

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Chrome on mobile: Option to open pages lazily or eagerly

Chrome on mobile opens pages lazily: it will only request and download the page when we actually access the page. This is good in most case.

But it's inconvenient in some cases: in nyc, before take or change train(there would be no mobile connection or wifi), I want to open some pages so I can read them later on the train.

Later when I access the webpage, it tries to download it, but there is no connection. It sucks.

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Reshared post from Rachelle Wooten:

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Original Post from Rachelle Wooten:

I love the ideas here!

Written by Aaron Svoboda Technology integration can become stalled when teachers and coaches focus solely on the subject area. Further, by necessity, many professional learning sessions are given to the entire, mult...

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