#sliding-window

3 posts.

LeetCode Longest Substring Without Repeating Characters

Solve LeetCode 3 Longest Substring Without Repeating Characters using a sliding window with a hash map. We go from brute force to a clean O(n) sweep.

Jun 18, 2026 ·5 min read · #dsa#leetcode#sliding-window

LeetCode Sliding Window Maximum: Deque Pattern

Solve LeetCode 239 Sliding Window Maximum in O(n) using a monotonic deque. Step-by-step walkthrough, interview script, and complexity analysis.

Jun 18, 2026 ·4 min read · #dsa#leetcode#sliding-window

The Sliding Window Technique

A practical guide to sliding window — fixed-size vs variable-size windows, expand/shrink invariants, and six classic problems with worked Python solutions.

Jun 16, 2026 ·9 min read · #dsa#sliding-window#intermediate