Fighting Armies

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Civil war is brewing in the kingdom of NaturalLand again, and this time, the rebels have adopted guerilla warfare. There are $N$ rebel soldiers and they are represented by the numbers $Rebel_1, Rebel_2, \ldots, Rebel_N$. The king has deployed his soldiers in a long defensive wall, and this is represented by two integers: $lower$ and $upper$. This means that the King's army contains ($upper$ - $low

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solution.cppC++17

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