Count islands in a Char grid.

DFS/BFS mutate visited. O(mn). Union-Find alternative.

Number of Islands: Android Interview Question

Number of Islands interview question with a clear example answer for Android engineers. Practice with AceMobileInterview.

This is a common Android interview topic: Number of Islands.

Below is a concise answer you can adapt in a real interview, then go deeper in the full AceMobileInterview track.

1.Count islands in a Char grid.
DFS/BFS mutate visited. O(mn). Union-Find alternative.

Keep going with AceMobileInterview

Reading helps. Timed practice locks it in. Jump into the interactive track for algorithms with LeetCode links, studio projects, debugging zips, and mobile system design.

iOS track Android track More guides

Number of Islands: Android Interview Question

1.Count islands in a Char grid.

Keep going with AceMobileInterview