Count Beautiful Substrings in a String | Efficient C++ Solution for LeetCode Hard Problem

Learn how to solve the **"Beautiful Substrings"** problem using an optimized C++ approach. This problem involves counting substrings where the number of vowels equals the number of consonants and their product is divisible by a given integer `k`. Perfect for coding interviews and Leetcode practice!

✔️ **Problem Highlights:**

* Prefix sum and hash map technique
* Efficient O(n) solution
* Suitable for strings up to 50,000 characters

✅ Includes step-by-step explanation and clean code in C++.

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