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ssd5的答案 op2 希望大家用处！

FIFO Simulation 

      Arriving: 100 pages from giraffe at 1 seconds
      Servicing: 100 pages from giraffe at 1 seconds
      Arriving: 75 pages from aardvark at 2 seconds
      Arriving: 50 pages from dolphin at 3 seconds
      Arriving: 2 pages from platypus at 4 seconds
      Arriving: 1 page from aardvark at 5 seconds
      Arriving: 1 page from herring at 6 seconds
      Arriving: 2 pages from falcon at 7 seconds
      Servicing: 75 pages from aardvark at 201 seconds
      Servicing: 50 pages from dolphin at 351 seconds
      Servicing: 2 pages from platypus at 451 seconds
      Servicing: 1 page from aardvark at 455 seconds
      Servicing: 1 page from herring at 457 seconds
      Servicing: 2 pages from falcon at 459 seconds

      Total jobs: 7
      Aggregate latency: 2347 seconds 
      Mean latency: 335.286 seconds