3405. Count the Number of Arrays with K Matching Adjacent Elements | Leetcode Daily - Python

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Ready to tackle a challenging LeetCode problem? In this video, we're diving deep into problem 3405: "Count the Number of Arrays with K Matching Adjacent Elements". This problem might seem tricky at first, but we'll break it down into a simple and elegant combinatorial solution. Instead of slow brute-force methods, we'll discover how to deconstruct the problem into two independent choices: first, selecting the positions for the 'k' matches using combinations, and second, assigning values to the resulting segments of the array. I'll walk you through the full mathematical logic, from the initial idea to the final formula. Then, we'll translate this into efficient Python code, complete with precomputation for factorials and modular exponentiation to pass even the toughest test cases. Join me to master this counting technique and level up your problem-solving skills!

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

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