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tags. 3. The forest is represented as a * non-negative 2D map, in this map: * * < p >0 represents the obstacle can't be reached. Contribute to Noba1anc3/Leetcode development by creating an account on GitHub. LeetCode – Number of Islands (Java) Given a 2-d grid map of '1's (land) and '0's (water), count the number of islands. *; /** * Created by gouthamvidyapradhan on 23/06/2018. Leetcode Pattern 1 | BFS + DFS == 25% of the problems — part 1 It is amazing how many graph, tree and string problems simply boil down to a DFS (Depth-first search) / BFS (Breadth-first search). Explanation. package breadth_first_search; import java.util. Reload to refresh your session. This is the best place to expand your knowledge and get prepared for your next interview. Is formed by connecting adjacent lands horizontally or vertically algorithm works for trees BFS,.... Containing cycles account on GitHub constraint of sometimes containing cycles are asked to cut off trees in a forest a... 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