SUM12
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"...a composition of a positive integer n is a way of writing n as a sum of strictly positive integers. Two sums which differ in the order of their summands are deemed to be different compositions, while they would be considered to be the same partition." - Quote from Wikipedia How many compositions of a number n are with summands either 1 or 2. Input The first line contains a number, the numb
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solution.cppC++17
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