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Logic =An elevator carrying five passengers made an upward journeic = "Going Up"y in an eight-story hospital. Passengers got on on the first five floors and left on the fourth through eighth floors. No two passengers entered or left the elevator on the same floor. Determine who the passengers were and floor entered and left. 1. The visitor, who was not Victor.......Do you know this puzzle?

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Pressing button at floor i or inside elevator invokes: request(i)
Door closing, invokes: release()
when elevator is moving up: it services all requests at or above current position; then reverses direction
when elevator is moving down: it services all requests at or below
current position; then reverses direction
If position<dest, wait in upsweep queue
If position>dest, wait in downsweep queue
If position==dest, service immediately
Wait in upsweep or downsweep, based on
current direction
On downsweep, higher dest has first claim to
service & so has the lower priority value

Posted on Oct 06, 2012

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This is not a "problem with the Operating Systems".

Further, you have not given enough information to solve this "logic" puzzle.

Posted on Sep 14, 2010


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