Compute task order with prerequisites

Q: Compute task order with prerequisites

This is a Coding & Algorithms interview question from Snowflake for Software Engineer roles. View the full question and solution on PracHub.

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Question

Given an integer n representing tasks labeled 0..n-1 and a list of prerequisite pairs (a, b) meaning b must be completed before a, return any valid ordering of tasks that completes all tasks, or an empty list if no ordering exists. Design an efficient algorithm and data structures, explain how you detect cycles, and analyze time and space complexity. Follow-ups: (

How would you produce all tasks that are part of at least one cycle? (
How would you handle up to 100,000 tasks and 200,000 prerequisites?

Compute task order with prerequisites

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