Скачать или смотреть Permutation in String | LeetCode 567 | Sliding Window Approach | Best Interview Explanation

In today’s video, we solve LeetCode 567 – Permutation in String using the Sliding Window + Frequency Counter technique.
This approach is one of the most common interview patterns asked in top tech companies like FAANG.

You’ll learn:

• How to build frequency maps using Python Counter
• How sliding window updates work in O(n) time
• How to compare character frequencies efficiently
• Complete dry run + intuition
• Interview-ready explanation for coding rounds

This method is optimal with:
Time Complexity: O(n)
Space Complexity: O(1) (since only 26 lowercase letters)


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