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Sizes of connected regions in a binary image, in scan order
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A binary image is an m x n grid of 0s and 1s. Foreground pixels (1s) that touch up, down, left or right belong to the same region; diagonal neighbours do not. Return the size of every region, listed in the order you first meet a pixel of that region when scanning the image row by row, left to right. Discuss BFS versus DFS, recursion depth on large images, and the time and space cost.
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