很好的介绍了函数式编程中的数据结构，代码使用haskell 和ml-A good introduction to functional programming in the data structure, the code uses haskell and ml

Spoj MKTHNUM题解 可持久化函数式编程线段树解法 文件内有相对详细的解法思路和数据结构构造方法-A solution to Spoj MKTHNUM.Which used persistent functional segment tree. Detailed information is written in the file.