Originally published at ewright3.com In January 2024, the SEC's official X account was hijacked. Attackers posted a fake Bitcoin ETF approval announcement, briefly moving markets. The Securities and Exchange Commission, the agency that writes the rules on public company cybersecurity disclosures, couldn't protect its own phone number. The compromise mechanism was a SIM swap. No sophisticated explo
A few years ago I solved 200 LeetCode problems and still froze on Mediums I hadn't seen. The breakthrough wasn't another hundred problems. It was a different loop. A problem asks for the longest substring with at most K distinct characters. You've solved sliding window before. Maximum sum subarray of size K, done. Longest substring without repeating characters, done. This third one stalls you. Twe