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All the Perl that's Practical to Extract and Report

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  • This is interesting. A few months ago I posted a puzzle to that went something like this:

    You have a rectangle raster of pixels - say 800 x 600 - stored in a linear array in normal raster fashion (so the first 800 elements of the array are the pixels from the top row, the next 800 from the next row and so on).

    Now, you want to rotate that raster through 90 degrees and, crucially, you don't want to use much temporary storage. You certainly can't afford to keep a second copy of the raster so you h