Shortest Path

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A hollow cylinder with radius $R$ and height $H$ is lying on a table. Cylinder's walls have negligible thickness. There are two points $A$ and $B$ marked on outer and inner surface of the cylinder respectively. An insect starts at point $A$ and reaches the point using the shortest path between these points. You have to find the total distance covered by the insect, or in other words the length

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solution.cppC++17

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