💡 Longest Awesome Substring | Bitmask + Prefix XOR C++ Solution | LeetCode

In this video, we solve **LeetCode 1542 – Find Longest Awesome Substring** using an **optimized Bitmask + Prefix XOR approach** in C++.
We break down the palindrome rearrangement condition, how to track digit frequencies with bitmasks, and efficiently find the longest substring meeting the condition in near-linear time.

📌 **What you will learn in this video:**

* Understanding the “awesome substring” definition
* Palindrome rearrangement condition (at most 1 odd frequency)
* Representing digit frequency parity with a 10-bit bitmask
* Using prefix XOR to detect valid substrings
* Complete **C++ implementation** with step-by-step explanation
* Time and space complexity analysis

💡 **Problem constraints:**

* 1 ≤ s.length ≤ 10⁵
* s consists only of digits (0–9)

Perfect for **competitive programming** and **FAANG interview preparation**!

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