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Monthly Archives for September, 2013



Lighthouse illumination

Posted on: September 1st, 2013 by
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There are k lighthouses in a plane. Each lighthouse can illuminate infinite distance, but only in an angle of 360/k degrees. The lighthouse lamp can be rotated, but the position of the light house is fixed. Given the positions of the lighthouses, show how you can rotate the lighthouses so that the entire plane is illuminated. via Puzzle Toad, brought to my attention by Kevin Continue reading the story "Lighthouse illumination"

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