Daily Coding Problem: Problem #856 [Medium]

Good morning! Here's your coding interview problem for today.

This problem was asked by Quora.

You are given a list of (website, user) pairs that represent users visiting websites. Come up with a program that identifies the top k pairs of websites with the greatest similarity.

For example, suppose k = 1, and the list of tuples is:

[('a', 1), ('a', 3), ('a', 5),
 ('b', 2), ('b', 6),
 ('c', 1), ('c', 2), ('c', 3), ('c', 4), ('c', 5)
 ('d', 4), ('d', 5), ('d', 6), ('d', 7),
 ('e', 1), ('e', 3), ('e': 5), ('e', 6)]

Then a reasonable similarity metric would most likely conclude that a and e are the most similar, so your program should return [('a', 'e')].

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