Surrounded Regions in Graph| DFS & BFS | LeetCode 130 | Python, Java & C++

Surrounded Regions in Graph is a popular LeetCode 130 problem based on DFS, BFS, Matrix and Grid Traversal. In this video, we solve the Surrounded Regions problem step by step using both DFS and BFS and understand why boundary-connected O regions should not be changed. What you'll learn: Surrounded Regions problem LeetCode 130 solution DFS approach BFS approach Boundary traversal How to find connected regions 4-directional movement How to mark visited cells Why boundary Os remain unchanged Python, Java & C++ solutions Time and space complexity Complexity Time: O(N × M) Space: O(N × M) in the worst case This problem is an important DFS/BFS + Matrix + Graph Traversal problem for coding interviews and DSA preparation. If you're preparing for LeetCode, coding interviews, or graph and matrix problems, this is an important problem to understand. Rising Brain (DSA Sheet): https://www.risingbrain.org/sheet Connect with me here: LinkedIn –   / anjalikumari22   Instagram –   / rbanjali.codes   Twitter (X) – https://x.com/anjali1kumari?s=21