Minimum Window Substring | LeetCode 76 | Sliding Window Explained | Python Best Solution

In this video, we solve LeetCode 76 – Minimum Window Substring, one of the most important sliding window problems in coding interviews.

You will learn:

• How to track required characters with a frequency map
• How to expand & shrink the window optimally
• How the missing-character logic works
• How to maintain the smallest valid window
• Step-by-step dry run and intuitive explanation
• Full Python code used in interviews

This problem is extremely popular in top tech interviews (FAANG, startups, product-based companies) because it tests:

✔ Window shrinking techniques
✔ Counting frequencies correctly
✔ Logic building under constraints
✔ Clean & optimal O(n) solution
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