项目欧拉有近400编程难题。有没有框架，但最初的几个难题是很简单的，这不应该是一个问题。

Project Euler has almost 400 programming puzzles. There are no frameworks, but the first few puzzles are simple enough that this shouldn't be a problem.

上衣codeR 是一个在线编码竞赛现场。您可以打开过去在他们的竞争舞台的小程序问题的做法。所有你需要做的是写在问题中所描述的功能。然而，这些问题有广泛的难度。即使是最简单的是更困难比期初那些在项目欧拉。

TopCoder Is an online coding competition site. You can open past problems in their competition arena applet for practice. All you need to do is write the one function described in the problem. However, the problems have a wide range of difficulty. Even the easiest ones are more difficult than the beginning ones at Project Euler.