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Leetcode 1254. Number of Closed Islands
Count the number of 4-directionally connected components of 0s in a binary grid that are completely surrounded by 1s (i.e., the component does not touch the grid boundary). This is a flood-fill/DFS-BFS style problem on an up to 100x100 grid.
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Late January, 2026
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Early January, 2026
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Mid November, 2025
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