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The first method: recursion Copy Code code as follows: def perms (elements): If Len (elements) Yield elements Else For Perm in Perms (elements[1:]): For I in range (len (elements)): Yield perm[:i] + elements[0:1] + perm[i:]

September 13, the domestic web site in the attention of the Alexa rankings again staged collective diving. including 21CN, Hao123, enet Silicon Valley Power and blog network, such as many of the rankings of Chinese sites have fallen sharply, most of

Because the writing is not good, although very early to be educated to write soft Wen, pretending to be serious in front of the computer for half a day did not suppress a bit decent text. No way, we can not steal the fruits of other stationmaster's

This article lists some of the projects and components that are supported by Flash flex back-end. These flex service components are lightweight and fast, and enable many of the functions that interact with the background. No one said Flash Flex has

Recently to help users analyze a lot of web site found that most of the title and description of the site can not be correctly set to make the site quickly get rankings and ranking concussion is relatively large, today and the webmaster share my SEO

Yesterday the most let us do seo shock is that you know what it is? That is Robin (Liu Yibin) optimization of a single page site unexpectedly in the morning rushed to Baidu "SEO training" fourth position, to the night incredibly rushed to the first (

Article title is I know in Baidu to see a problem, ask the netizen feel very puzzled and attach the relevant picture to answer. Because the small series is also engaged in the SEO industry, which is also very interested, so in-depth research, found

For many novice friends, when you hear only the optimization one months after the keyword ranking on all up to the top 10, it will feel incredible. However, I would like to tell you that it is not difficult, whether it was before or now. Of course,

With the changes in our domestic Internet environment, the survival of personal webmaster more and more difficult, webmaster entrepreneurial new direction also has a lot of changes, from the original to do the flow of money began to do industry

This morning to search a key word planting teeth, accidentally found that the number one is the first hospital a single article. Carefully look at the word Baidu bid many, the site is quite a lot. So I was curious to find out what was going on. Oh,

Before many SEO this piece of friends have told me to exchange links is very difficult, or no platform, in time to have a platform, also do not know the site to exchange links when you need to pay attention to what problems. or some webmaster said

Recently, Taiyuan SEO has been in and SEO friends talk about this two days Baidu large-scale K station, this is also to June 22 after the big update of Baidu and a new action, from A5 and some of the big Web site survey showed 75% webmaster sites

In the past, we thought that there was only one possible order of stack entry, namely, 4321, or, because we always thought that the stack was first and later ....., at last, I finally realized that the elements in front of the stack may be out of

Ha, I got up this morning and wrote the experience. Although it was just a few simple words, it was indeed a personal experience.ArticleSome people are saying that such articles are also on the homepage. Indeed, they have no technical skills. They

Tianxiprogramming community index for each l 2008 then l headline: Lua hype seems to be over (fallen out of top 20). What is next? Groovy, Erlang? The tianyprogramming community Index gives an indication of the popularity of programming ages. the

I am still remembering the days before. I spent a little money looking for several websites to hook up the links. After a few days, my website's keyword ranking will go up, I still remember that I had to keep releasing external links for my website

1. no keyword analysis is performed. Unclear direction, unreasonable keyword configuration, poor ranking performance, large investment, low return rates, all of which are key-less problems. these problems are fatal. Title is the core point of the

: The boss needs short-term results, the site's ranking in the short term can be effective? Website short-term can bring customers?Guide: SEO is a bitter force occupation, really bitter force! Because many business owners do not understand, they

I row a few time limit: 1000 ms | Memory limit: 65535 KB Difficulty: 3 description There is now a "abcdefghijkl" of 12 characters, arranged in all of its permutations in a dictionary order, giving any sort of arrangement, saying how small the

jzxx1057 allowed to rank in parallel Time limit 1000MS/16MBTopic Description In the various competitions we participate in, we often encounter the way to allow parallel rankings. For example, four contestants scored 50, 80, 50, and 30, then 80