编程模拟一个作业的执行过程，用户输入系统分配给该作业的物理块N和该作业要访问的逻辑页号序列长度L，采用下面不同的页面置换算法：FIFO,LRU,OPT,LFR,NUR,给出不同算法下的页面置换情况及其对应的缺页率-Programmed to simulate a job execution, the user input system assigned to the job and the job of physical block N logical page number to access the sequence length L, use the following different page replacement algorithm: FIFO, LRU, OPT, LFR, NUR, given under different page replacement algorithms and their corresponding page fault rate