1.模拟操作系统内存管理2.内容要求：⑴ 自定义内存管理策略对应的数据结构；⑵ 随机产生一组申请与收回进程及要求分配与收收回内存的大小，实现内存分配与收回算法（能使用多种分配算法），计算内存运用率；⑶⑶ 显示出来内存分区管理的分配与收回过程。

-A simulated operating system memory management. Content requirements: the ⑴ custom memory management strategy, the data structure　(2) randomly generated a set of applications and to recover the process and requirements allocation and revenue recovery of memory size, memory allocation algorithm to recover ( use a variety of allocation algorithm) to calculate memory utilization rate　(3) the distribution and recovery process of the memory partition management ⑶ displayed.