Скачать или смотреть Leetcode 567 - Permutation in String | Sliding Window | java Solution

In this video, we solve LeetCode 567 – Permutation in String using an efficient Java solution with the sliding window technique.

👉 Problem Statement:
Given two strings s1 and s2, return true if s2 contains a permutation of s1.
In other words, check if one of the substrings of s2 is an anagram of s1.

👉 What You’ll Learn in This Video:

Brute force approach (O(n * m)) and why it’s inefficient.

Optimized sliding window + frequency count approach (O(n)).

Step-by-step Java code walkthrough.

How to compare character frequencies using arrays/maps.

Dry-run examples for clarity.

Time and space complexity analysis.

👉 Key Concepts Covered:

Sliding window technique.

Character frequency arrays (int[26]) for efficient comparison.

String pattern matching.

Complexity: O(n) time, O(1) space (fixed alphabet size).

🚀 By the end of this video, you’ll confidently solve the Permutation in String problem and apply the sliding window technique to other substring matching problems.

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