LeetCode 137 | Longest Substring with Vowels in Even Count | Bitmask + Basic | MANG Interview Prep

LeetCode 137 | Longest Substring with Vowels in Even Count | Bitmask + Basic | MANG Interview Prep In this video, I solve the classic “Longest Substring Containing Vowels in Even Count” problem, a popular question in MANG interviews. I start with a basic approach to build intuition and then dive deep into the optimal bit manipulation / bitmasking technique used by top engineers. This problem has appeared in technical interviews at Meta, Amazon, Netflix, and Google. You’ll learn pattern recognition, mask tracking, parity logic, and how to convert brute force thinking into an optimized solution. A must-watch for serious MANG DSA preparation.