LeetCode 3 – Longest Substring Without Repeating Characters | Python | Hindi/Urdu 2026
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In this video, we solve LeetCode 3: Longest Substring Without Repeating Characters, one of the most important sliding window problems asked in FAANG interviews.
We start with a Brute Force approach to build intuition and then optimize it using the Sliding Window technique for maximum efficiency.
🔹 Approaches Covered:
Brute Force Solution → ⏱️ O(N²)
Sliding Window (Hash Set / Hash Map) → ⚡ O(N)
Step-by-step explanation with dry run
Time & space complexity analysis
🔹 What You’ll Learn:
How sliding window works in real interviews
When brute force fails and why optimization matters
Interview-ready Python implementation
Common mistakes candidates make
How to explain your approach clearly
📌 Explained completely in Hindi/Urdu, perfect for:
LeetCode beginners
DSA practice
Coding interviews
FAANG preparation
👉 Watch till the end to master sliding window problems and boost your problem-solving skills.
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