1.B树的实现 2.ElfHash的实现 3.三种排序方式(插入，归并，快速）-1.B tree 2.ElfHash to achieve the realization of 3. Three Sort by (insert, merging, fast)

常用字符串哈希函数有BKDRHash，APHash，DJBHash，JSHash，RSHash，SDBMHash，PJWHash，ELFHash等等。-The common string hash function BKDRHash, APHash, DJBHash, JSHash, RSHash, SDBMHash, PJWHash, ELFHash, etc..