This diagram illustrates the concept of performing two depth-first search (DFS) traversals in a grid. The first DFS starts from the top-left cell and ends at the bottom-right cell, marking each visited cell. The second DFS starts from the bottom-right cell and ends at the top-left cell, again marking each visited cell. Any cell that is visited in both DFS traversals is a potential articulation point.
Two DFS Traversals in a Grid
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