How do I practice coding and algorithm questions?

Use PracHub's coding console to write, test, and debug your solutions in Python or JavaScript. View hints, test against sample inputs, and compare with official solutions.

What difficulty level is this coding question?

This is a medium difficulty Coding & Algorithms question, commonly asked during Technical Screen rounds at Waymo.

What role is this question designed for?

This question is commonly asked for Software Engineer candidates at Waymo during technical interviews.

Validate a Parent-Child Forest | Waymo Coding Question

Quick Overview

This question evaluates understanding of graph theory concepts—specifically rooted trees, parent-child relationships, cycle detection, and node in-degree constraints—and the ability to implement validation logic for data structures representing forests.

Quick Overview

medium
Waymo
Coding & Algorithms
Software Engineer

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