Python实现的协同过滤推荐算法，包括UserBaseCF和ItemBaseCF两种，使用的数据集是Movielens数据集，包含在源码中。

经典算法之换位和工作安排-classic algorithms transposition and organization of work

递归的缺点： –递归算法解题相对常用的算法如普通循环等，运行效率较低。因此，应该尽量避免使用递归，除非没有更好的算法或者某种特定情况，递归更为适合的时候。在递归调用的过程当中系统为每一层的返回点、局部量等开辟了栈来存储。递归次数过多容易造成栈溢出等 –执行时间长、占用空间多 –主要原因：递归调用时的现场保护与恢复（相对于迭代过程而言） 一个反复执行过程，可否用循环结构实现？ 递归调用时，返回点怎么记录？ 递归返回时，如何接着以前的断点继续执行？ 返回值如何处理：若当前是较深一层的递归调用，如何将返回值返回到上一层递归过程的引用位置上？ 系统栈：保护现场、保存返回值、返回地址

ASCII码转BCD码算法-ASCII transfer algorithm BCD

Please read your package and describe it at least 40 bytes. System will automatically delete the directory of debug and release

Polynomial fit functions === === RegressionObject.cls contains a class that provides an easy way to add polynomial regression functionality to any application. If you just want linear regression or a very high degree, no matter: this class has good performance and scales seamlessly with the complexity of your problem.-Polynomial fit functions === === === === RegressionObject.cls contains a class that provides an easy way to add polynomial regression functionality to any application. If you just want linear regression or a very high degree, no matter: this class has good performance and scales seamlessly with the complexity of your problem.

魔方算法 即横竖斜的数字和都相等的方阵-Cube algorithm that regardless of the number of ramps and are equal to the matrix

杭州电子科技大学在线系统ACM的2037题，用贪心方法解决-Hangzhou University of Electronic Science and Technology ACM-line system of the 2037 title with a greedy solution

大数类，重载了各类操作符，可以直接使用-fate categories, a variety of heavy-duty operator can be used directly

这是一段关于四种排序方法的完全源代码及其相互之间的比较,包括:Heap sort,Merge sort,Quick sort,Radix sort-This is a period of about four kinds of methods to sort the complete source code and the comparison between, including: Heap sort, Merge sort, Quick sort, Radix sort