Find root IDs and paths

Q: Find root IDs and paths

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

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Question

You are given a collection of string blocks, each represented as a JSON object with fields {"id": string, "parentId": string | null}. A block is a root if it has no parent (parentId is null or the referenced parent does not appear).

Write a function that returns all root ids from the input.
Follow-up: given a target id, return the path of ids from its root to that id. Explain your approach, the data structures you use, and analyze time and space complexity.

Find root IDs and paths

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