Expected GCD

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Chef loves to make dishes. Currently, he has $N$ ingredients (numbered $1$ through $N$) which he can use to cook various dishes. To make a dish, Chef must use exactly $K$ ingredients in a correct order. Therefore, a dish is a sequence of $K$ distinct integers between $1$ and $N$. The tastiness of that dish is defined as the GCD of these integers (all the ingredients in that dish). Chef wants to c

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solution.cppC++17

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