Google has many visitors to its site. And it tracks what pages the
customers visited, etc and other stuff. Lets say you store the data of
customer id and the page id as a record in a log-file. Now assuming
that you have created one log file for each day with that above data-
format. Give me the way to find all the customers who made a visit on
day1 and day2 and visited atleast two different pages. Say a customer
visited two different pages on day1 and then comes back on day2 and
visited some other page on day2 he should be listed.

Lets say the logfile1 has contents like:
c1 p1
c2 p2
c1 p3
c3 p4
c5 p6

And logfile2 has contents:
c10 c7
c4 p4
c3 p4
c5 p1
c1 p2
c2 p1

Then the customers you print out are c1, c2, c5.

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