IP Range to CIDR: Fewest Blocks for a Range

CodingOpenAILast reported October 2025Low Frequency

Problem Overview

OpenAI coding question, reconstructed from 1 candidate report (October 2025). The write-up includes a Python solution that passes 9 test cases.

The full problem statement — full requirements, constraints, and edge cases
Approach and trade-offs — what passing candidates did, and the mistakes that sink people

Unlock the full OpenAI catalog

Full problem statements, candidate-reported follow-ups, and walkthroughs — for every OpenAI question.

Already a member? Sign in

Verified Source

Every question is reconstructed from multiple independent candidate reports. Follow-ups candidates reported, not invented ones.

Codex Fact-Checked

Technical claims, formulas, and scale numbers are reviewed against primary sources.

Interviewer Follow-ups

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