AI Interview Prep is optimized for larger screens
Please open this on a laptop or desktop (1024px and wider) to use the full editor, whiteboard, and AI coaching surface.
Section 1Understand Problem
Section 01
Understand the problem
Restate the problem precisely. Interviewers reward candidates who pause, define the contract, and name the guarantees before coding.
Problem statement
A phrase is a palindrome if, after converting all uppercase letters into lowercase letters and removing all non-alphanumeric characters, it reads the same forward and backward. Alphanumeric characters include letters and numbers. Given a string `s`, return `true` if it is a palindrome, or `false` otherwise.
Example
s = "A man, a plan, a canal: Panama" → true
Constraints
1 ≤ s.length ≤ 2 × 10⁵ · s consists only of printable ASCII characters
Audio recording unsupported on this browser.
WPM—Fillers0Pace—Thinking0%
Explain the problem in your own words
0 words0 chars
AI Review
Write your thinking above first.
Once you've drafted a response, click Submit for AI review and a senior engineer will critique your reasoning.
Ready to submit Section 1?
The reviewer will check whether you stated inputs, output, guarantees, and any assumption you flagged.
Write at least a couple of sentences explaining the problem before submitting.