I don't know about any specific to R, but there are quite a few questions tagged code-golf, here on Stack Overflow. Many of them are language agnostic, but not all.
Another area of the site that I like to visit are the questions tagged rosetta-stone. Those questions specifically ask for answers from every programming language.
I haven't heard of any, but you could visit some math-oriented challenges, where you can solve problems in any programming language you wish. One I know is http://projecteuler.net
Bah, someone was faster ;). A thing to be added: after you solve a riddle there, you can see others posts on it, many people submit they code, I saw some R code there afair.
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我不知道有什么专门针对 R 用户的。 但是您会在 Project Euler 挑战赛中找到大量 R 条目。 请参阅此博客，例如：
I don't know of any specifically for R users. But you'll find a good number of R entries on the Project Euler challenge. See this blog, for example:
我不知道 R 的具体情况，但是有很多标记为
code-golf，位于 Stack Overflow 上。 其中许多与语言无关，但并非全部。我喜欢访问的网站的另一个区域是标记为
rosetta-stone的问题。 这些问题专门要求每种编程语言提供答案。I don't know about any specific to R, but there are quite a few questions tagged
code-golf, here on Stack Overflow. Many of them are language agnostic, but not all.Another area of the site that I like to visit are the questions tagged
rosetta-stone. Those questions specifically ask for answers from every programming language.我没有听说过任何挑战，但您可以访问一些面向数学的挑战，在那里您可以用任何您想要的编程语言解决问题。 我知道的一个是 http://projecteuler.net
呸，有人更快;)。 补充一点：当你在那里解决了一个谜语之后，你可以看到其他人的帖子，很多人提交了他们的代码，我在那里看到了一些R代码。
I haven't heard of any, but you could visit some math-oriented challenges, where you can solve problems in any programming language you wish. One I know is http://projecteuler.net
Bah, someone was faster ;). A thing to be added: after you solve a riddle there, you can see others posts on it, many people submit they code, I saw some R code there afair.