DSA Python 2025 – Number of Islands | DFS & BFS Grid Traversal | Leetcode 200 – Part 131 [Hindi]

🚀 Welcome to Part 131 of Code & Debug’s DSA Python Course 2025!

In this video, we solve Leetcode 200: Number of Islands, one of the most classic problems based on grid traversal. You’ll learn how to count the number of disconnected land masses using both DFS and BFS techniques.

📚 What you’ll learn in this video:
✅ Understanding grid-based island problems
✅ DFS-based approach for marking connected land
✅ BFS approach using queue and visited matrix
✅ Handling edge cases and island counting logic
✅ Time and space complexity analysis

💡 Why is this important?
Mastering problems like Number of Islands builds your fundamentals for solving similar questions like flood fill, surrounded regions, enclaves, rotten oranges and more. This is a must-know problem for any tech interview.

👉 Practice the problem on Leetcode:
🔗 https://leetcode.com/problems/number-of-islands/

👉 Refer to the article for better understanding:
🔗 https://codeanddebug.in/blog/number-of-islands-leetcode-200/

👉 📄 Access the full YouTube DSA Playlist Sheet (All Questions in Order):
🔗 https://docs.google.com/spreadsheets/d/1AWE15Fy3wD2iqu2vjK_R7cCiuvSsjYQclcdZmHpF66o/edit?usp=sharing

👉 Enroll in this FREE DSA Python course here:
🔗 https://codeanddebug.in/course/master-dsa-with-leetcode

👉 Enroll for Self-Paced Advanced DSA course here:
🔗 https://codeanddebug.in/course/zero-to-hero-python-dsa

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