生成站点地图的最有效算法？
..给定一个 URL 作为输入（C 编程语言）。 （来自 sitemap.org 的站点地图规范）。
..given an URL as input (C programming language). (Sitemap specifications from sitemap.org).
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正如 apphacker 的评论中所述，我们真的不知道您要做什么。 如果您计划只是从 html 网站上抓取链接，那么我会推荐某种词法扫描器生成器：例如 flex。
如果您获取网站网址作为输入，那么您将需要使用一些网络代码来读取网页。 如果您对 C 语言的网络一无所知，那么我建议您在谷歌上搜索 beej 的指南并从那里开始。
如果您只是按照标签建议获得一个直接的 XML 文件，那么如果您绝对必须使用 C，那么我会再次推荐 Flex。如果您不必使用 C，那么我会推荐 Perl 或 Python； 他们可能更适合这份工作。
无论哪种方式，我们都需要您向我们提供更多信息，但我希望这对现在有所帮助。
As stated in the comments by apphacker we don't really know what you're trying to do. If you are planning on just scraping links from a html website then I would recommend some sort of lexical scanner generator: like flex.
If you are getting a website url as input then you are going to need to use the some networking code to read the webpages. If you don't know anything about networking in C then I would recommend googling beej's guides and going from there.
If you are just getting a straight XML file as your tags suggest then once again I would recommend flex if you absolutely must use C. If you don't have to use C then I would recommend Perl or Python; they are probably better suited to the job.
Either way we need you to give us more information but I hope that helps for now.