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Problem · Array

Most Frequent Consecutive Website Pattern

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AmazonNEW GRADONSITE INTERVIEW

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Problem statement

You are given three equal-length arrays describing website visits. Entry i contains a username, an integer timestamp, and a website.

For each user, sort visits by timestamp; when timestamps are equal, keep their original input order. Every three adjacent visits in that per-user order form a consecutive website pattern. A user contributes at most once to the count of any distinct pattern, even if that pattern occurs several times for the user.

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Examples

Example 1

usernames = ["amy","amy","amy","ben","ben","ben"]timestamps = [1,2,3,1,2,3]websites = ["home","cart","pay","home","cart","pay"]return = ["home","cart","pay"]

Both users have the consecutive pattern [home, cart, pay], so it has two distinct-user supporters.

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