Count Good Numbers | Leetcode 1922 | Fast Modular Exponentiation Explained

In this video, we solve Leetcode 1922 - Count Good Numbers using modular exponentiation in Python. We'll walk through why we split positions into even and odd indexes, how we choose 5 digits for even and 4 for odd positions, and how to apply fast exponentiation efficiently. This is a common math + number theory based problem involving modulo operations and powers. We'll discuss bit manipulation in exponentiation, edge cases, and optimization. Whether you're preparing for a coding interview or brushing up on modular arithmetic, this step-by-step Python tutorial will help you understand this pattern clearly.

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