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When do you use a sparse array?

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1.
What are the advantages of parallel arrays over the traditional arrays?
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2.
Which of the following can be called a parallel array implementation?

a)

   firstName  = ['Joe','Bob','Frank','Hans']
   lastName   = ['Smith','Seger','Sinatra','Schultze']
   heightInCM = [169,158,201,199]
 
   for i in xrange(len(firstName)):
       print "Name:",firstName[i], lastName[i]
       print "Height in CM:,",heightInCM[i]

b)

   firstName  = ['Joe','Bob','Frank','Hans']
   lastName   = ['Smith','Seger']
   heightInCM = [169,158]
 
   for i in xrange(len(firstName)):
       print "Name:",firstName[i], lastName[i]
       print "Height in CM:,",heightInCM[i]

c)

   firstName  = ['Joe','Bob']
   lastName   = ['Smith','Seger','Sinatra','Schultze']
   heightInCM = [169,158]
 
   for i in xrange(len(firstName)):
       print "Name:",firstName[i], lastName[i]
       print "Height in CM:,",heightInCM[i]

d) None of the mentioned
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The number of items used by the dynamic array contents is its __________
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The information about an array that is used in a program will be stored in
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What are the disadvantages of arrays?
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