1) A - Find the top-5 VoteTypeIds that have the most distinct
posts. You need to output the VoteTypeId and the number of posts. The
results are ranked in descending order according to the number of posts, and
each line is in format of: VoteTypeId\tNumber of posts.
1) B - Find all posts that are favoured by more than 10 users.
You need to output both PostId and the list of UserIds, and each line is in
format of: PostId#UserId1,UserId2,UserId3,…,UserIdn
2) Given a large text file, your task is to find out the top-k most frequent co-occurring
term pairs. The co-occurrence of (w, u) is defined as: u and w
appear in the same line (i.e., (w, u) and (u, w) are treated equally).
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