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说明：  这是一个页面置换算法的实现，功能描述：输入可用内存页面数和一个作业访问逻辑页号的序列 *给出FIFO、LRU、OPT算法的缺页中断率 *本程序中设初始页框里的页号与实际页号都不同
(This is a page replacement algorithm to achieve functional description : Importation of a few pages available memory and a logic operation visit, the page is given sequence* FIFO, the LRU, OPT algorithm vacancy rate* Page interrupted the proceedings set up the initial page listing page, and the actual page numbers are different)