1922. Count Good Numbers | Leetcode Daily - Python

Dive into LeetCode 1922: Count Good Numbers! We break down this math-heavy problem step-by-step. Learn how to define "good numbers" based on even/odd index constraints (5 choices for even positions, 4 for odd). The real challenge comes from the potentially massive input 'n' (up to 10 to the power of 15) and the need for results modulo 10 to the power of 9 plus 7. Discover the crucial technique of fast modular exponentiation (power calculation) to efficiently compute the answer (5^num_even * 4^num_odd) % MOD without overflow or exceeding time limits. Understand the O(log n) time and O(1) space complexity.

Perfect for coding interview preparation and improving problem-solving skills.

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