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How to Block Disposable Email Signups Without SMTP Verification

Disposable email services make it easy to create temporary addresses that disappear shortly after signup. They can be useful for privacy, but they also create problems for applications that rely on email for account recovery, trial limits, community moderation, or fraud prevention. In this article, I will show a lightweight way to screen an email address before accepting a signup. What should we…

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From brute force to optimal: leveling up like a Jedi

The Quest Begins (The "Why") I still remember the first time I tried to solve the “maximum subarray sum” problem on a coding interview.

  • Author recalls first encountering "maximum subarray sum" problem in coding interview
  • Transforms brute-force O(n³) solution to optimal O(n) Kadane's algorithm
  • Emphasizes running state mindset for efficient problem-solving in programming

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