How should I practice Versioned Followers and Followees?

Start by reading the full statement, solve the visible examples, then compare the pattern against related OpenAI phone screen problems in FastPrep.

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Problem · Design

Versioned Followers and Followees

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OpenAIFULLTIMEPHONE SCREEN

Problem statement

A directed social graph has n users numbered from 0 to n - 1. A relationship u -> v means that user u follows user v.

Process a finite sequence of relationship updates, immutable snapshots, and historical list queries. Every snapshot includes all earlier updates. Later updates never change an earlier snapshot.

The problem statement continues

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Examples

Example 1

n = 4operations = ["FOLLOW 0 1","FOLLOW 2 1","SNAPSHOT","GET_FOLLOWERS 1 0","GET_FOLLOWEES 0 0"]return = ["0","[0,2]","[1]"]

At snapshot 0, users 0 and 2 follow user 1. User 0 follows only user 1.

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