Role Permission with Inheritance and Deny Rules

Phone ScreenSnowflakeLast reported August 2026Medium Frequency

Reported: 8× across candidate reports
First seen: February 2025
Last reported: August 2026
Reported outcome: mixed

Problem Overview

You are given a role hierarchy represented as a directed acyclic graph (DAG). Roles are numbered 0 to n-1. An array grants contains edges [from, to] meaning role to inherits privileges from role from. Each role i has an allowedList[i] (privileges explicitly granted) and a disallowedList[i] (privileges explicitly blocked). Inheritance…

3 candidate-reported follow-ups — the exact probes interviewers asked, with the trigger for each
The rest of the problem statement — full requirements, constraints, and edge cases
Approach and trade-offs — what passing candidates did, and the mistakes that sink people

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Verified Source

Every question is reconstructed from multiple independent candidate reports. Verbatim follow-ups, not invented ones.

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Interviewer Follow-ups

The exact follow-ups reported by candidates, with the trigger that prompts each one — plus the mistakes that sink people.