Description: Main page scheduling algorithm: FIFO, least recently used scheduling algorithm (LRU), least recently used scheduling algorithm (LFU), the best algorithm (OPT) subject requirements: ① the realization of the three algorithms: 1, FIFO 2, OPT 3, LRU ② page sequence from the specified text file (TXT files) out of ③ Output: the first line: every time out the page number, the second line: shows the total number of missing pages
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