Longest Substring in O(n) 🔥 (Stop Using O(n²))

Longest Substring Without Repeating Characters — solved in O(n).

Most students use nested loops (O(n²)).

But sliding window makes it linear time:
✔ Expand right pointer
✔ Shrink left when duplicate appears
✔ Maintain valid window

Key idea:
We don’t restart. We adjust.

If you're preparing for coding interviews, this pattern is important.

Follow for serious DSA breakdowns 🚀

#SlidingWindow #DSA #LeetCode #CodingInterview #Programming

Видео Longest Substring in O(n) 🔥 (Stop Using O(n²)) канала bhuvanbhw