Parentheses Matching

Phone ScreenSnowflakeLast reported August 2025Low Frequency

Problem Overview

Given a string containing parentheses, determine whether the parentheses are balanced (valid). The base version uses only '()'. The follow-up…

1 candidate-reported follow-up — 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.